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Thu, 04 Sep 2025 05:36:35 -0700 (PDT) Received: from mva-rohm ([213.255.186.37]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-5608acfbfa8sm1209717e87.96.2025.09.04.05.36.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 04 Sep 2025 05:36:34 -0700 (PDT) Date: Thu, 4 Sep 2025 15:36:30 +0300 From: Matti Vaittinen To: Matti Vaittinen , Matti Vaittinen Cc: Jonathan Cameron , David Lechner , Nuno =?iso-8859-1?Q?S=E1?= , Andy Shevchenko , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Matti Vaittinen , Linus Walleij , Bartosz Golaszewski , Marcelo Schmitt , Javier Carrasco , Tobias Sperling , Antoniu Miclaus , Trevor Gamblin , Esteban Blanc , Herve Codina , Ramona Alexandra Nechita , Eason Yang , Pop Ioan Daniel , linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org Subject: [PATCH v2 1/3] dt-bindings: iio: adc: ROHM BD79112 ADC/GPIO Message-ID: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="FZkLJYUOdbpGadK3" Content-Disposition: inline In-Reply-To: --FZkLJYUOdbpGadK3 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" The ROHM BD79112 is an ADC/GPIO with 32 channels. The channel inputs can be used as ADC or GPIO. Using the GPIOs as IRQ sources isn't supported. The ADC is 12-bit, supporting input voltages up to 5.7V, and separate I/O voltage supply. Maximum SPI clock rate is 20 MHz (10 MHz with daisy-chain configuration) and maximum sampling rate is 1MSPS. Add a device tree binding document for the ROHM BD79112. Signed-off-by: Matti Vaittinen Acked-by: Conor Dooley --- Revision history: v1 =3D> v2: - BD79112 can act as a GPIO controller. --- .../bindings/iio/adc/rohm,bd79112.yaml | 116 ++++++++++++++++++ 1 file changed, 116 insertions(+) create mode 100644 Documentation/devicetree/bindings/iio/adc/rohm,bd79112.= yaml diff --git a/Documentation/devicetree/bindings/iio/adc/rohm,bd79112.yaml b/= Documentation/devicetree/bindings/iio/adc/rohm,bd79112.yaml new file mode 100644 index 000000000000..8aeac5b60880 --- /dev/null +++ b/Documentation/devicetree/bindings/iio/adc/rohm,bd79112.yaml @@ -0,0 +1,116 @@ +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/iio/adc/rohm,bd79112.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: ROHM BD79112 ADC/GPO + +maintainers: + - Matti Vaittinen + +description: | + The ROHM BD79112 is a 12-bit, 32-channel, SAR ADC. ADC input pins can be + also configured as general purpose inputs/outputs. SPI should use MODE 3. + +properties: + compatible: + const: rohm,bd79112 + + reg: + maxItems: 1 + + spi-cpha: true + spi-cpol: true + + gpio-controller: true + "#gpio-cells": + const: 2 + + vdd-supply: true + + iovdd-supply: true + + "#address-cells": + const: 1 + + "#size-cells": + const: 0 + +patternProperties: + "^channel@([0-9]|[12][0-9]|3[01])$": + type: object + $ref: /schemas/iio/adc/adc.yaml# + description: Represents ADC channel. Omitted channels' inputs are GPIO= s. + + properties: + reg: + description: AIN pin number + minimum: 0 + maximum: 31 + + required: + - reg + + additionalProperties: false + +required: + - compatible + - reg + - iovdd-supply + - vdd-supply + - spi-cpha + - spi-cpol + +additionalProperties: false + +examples: + - | + spi { + #address-cells =3D <1>; + #size-cells =3D <0>; + adc: adc@0 { + compatible =3D "rohm,bd79112"; + reg =3D <0x0>; + + spi-cpha; + spi-cpol; + + vdd-supply =3D <&dummyreg>; + iovdd-supply =3D <&dummyreg>; + + #address-cells =3D <1>; + #size-cells =3D <0>; + + gpio-controller; + #gpio-cells =3D <2>; + + channel@0 { + reg =3D <0>; + }; + channel@1 { + reg =3D <1>; + }; + channel@2 { + reg =3D <2>; + }; + channel@3 { + reg =3D <3>; + }; + channel@4 { + reg =3D <4>; + }; + channel@5 { + reg =3D <5>; + }; + channel@6 { + reg =3D <6>; + }; + channel@16 { + reg =3D <16>; + }; + channel@20 { + reg =3D <20>; + }; + }; + }; --=20 2.51.0 --FZkLJYUOdbpGadK3 Content-Type: application/pgp-signature; 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Thu, 04 Sep 2025 05:36:51 -0700 (PDT) Received: from mva-rohm ([213.255.186.37]) by smtp.gmail.com with ESMTPSA id 38308e7fff4ca-337f50328fcsm14956401fa.40.2025.09.04.05.36.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 04 Sep 2025 05:36:50 -0700 (PDT) Date: Thu, 4 Sep 2025 15:36:46 +0300 From: Matti Vaittinen To: Matti Vaittinen , Matti Vaittinen Cc: Jonathan Cameron , David Lechner , Nuno =?iso-8859-1?Q?S=E1?= , Andy Shevchenko , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Matti Vaittinen , Linus Walleij , Bartosz Golaszewski , Marcelo Schmitt , Javier Carrasco , Tobias Sperling , Antoniu Miclaus , Trevor Gamblin , Esteban Blanc , Herve Codina , Ramona Alexandra Nechita , Eason Yang , Pop Ioan Daniel , linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org Subject: [PATCH v2 2/3] iio: adc: Support ROHM BD79112 ADC/GPIO Message-ID: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="p2j7jxvmv06+tZC6" Content-Disposition: inline In-Reply-To: --p2j7jxvmv06+tZC6 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" The ROHM BD79112 is an ADC/GPIO with 32 channels. The channel inputs can be used as ADC or GPIO. Using the GPIOs as IRQ sources isn't supported. The ADC is 12-bit, supporting input voltages up to 5.7V, and separate I/O voltage supply. Maximum SPI clock rate is 20 MHz (10 MHz with daisy-chain configuration) and maximum sampling rate is 1MSPS. The IC does also support CRC but it is not implemented in the driver. Signed-off-by: Matti Vaittinen --- Revision history: v1 =3D> v2 (mainly based on reviews by Andy and David, thanks!) - Fix Kconfig dependency to REGMAP_SPI instead of REGMAP_I2C - Add a few header includes - Drop unnecessary alignments - plenty of styling - use for_each_set_clump8 instead of open-coding it - change order of direction setting writes to avoid receiving 'event' when direction is changed from input to output. - fix data-sheet names and assigning of them to iio_dev --- drivers/iio/adc/Kconfig | 10 + drivers/iio/adc/Makefile | 1 + drivers/iio/adc/rohm-bd79112.c | 551 +++++++++++++++++++++++++++++++++ 3 files changed, 562 insertions(+) create mode 100644 drivers/iio/adc/rohm-bd79112.c diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig index e3d3826c3357..64ce1eda78c4 100644 --- a/drivers/iio/adc/Kconfig +++ b/drivers/iio/adc/Kconfig @@ -1309,6 +1309,16 @@ config RN5T618_ADC This driver can also be built as a module. If so, the module will be called rn5t618-adc. =20 +config ROHM_BD79112 + tristate "Rohm BD79112 ADC driver" + depends on I2C && GPIOLIB + select REGMAP_SPI + select IIO_ADC_HELPER + help + Say yes here to build support for the ROHM BD79112 ADC. The + ROHM BD79112 is a 12-bit, 32-channel, SAR ADC, which analog + inputs can also be used for GPIO. + config ROHM_BD79124 tristate "Rohm BD79124 ADC driver" depends on I2C diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile index 89d72bf9ce70..34b40c34cf71 100644 --- a/drivers/iio/adc/Makefile +++ b/drivers/iio/adc/Makefile @@ -117,6 +117,7 @@ obj-$(CONFIG_QCOM_VADC_COMMON) +=3D qcom-vadc-common.o obj-$(CONFIG_RCAR_GYRO_ADC) +=3D rcar-gyroadc.o obj-$(CONFIG_RICHTEK_RTQ6056) +=3D rtq6056.o obj-$(CONFIG_RN5T618_ADC) +=3D rn5t618-adc.o +obj-$(CONFIG_ROHM_BD79112) +=3D rohm-bd79112.o obj-$(CONFIG_ROHM_BD79124) +=3D rohm-bd79124.o obj-$(CONFIG_ROCKCHIP_SARADC) +=3D rockchip_saradc.o obj-$(CONFIG_RZG2L_ADC) +=3D rzg2l_adc.o diff --git a/drivers/iio/adc/rohm-bd79112.c b/drivers/iio/adc/rohm-bd79112.c new file mode 100644 index 000000000000..8107d6b79fa4 --- /dev/null +++ b/drivers/iio/adc/rohm-bd79112.c @@ -0,0 +1,551 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * ROHM ADC driver for BD79112 signal monitoring hub. + * Copyright (C) 2025, ROHM Semiconductor. + * + * SPI communication derived from ad7923.c and ti-ads7950.c + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +#define BD79112_MAX_NUM_CHANNELS 32 + +struct bd79112_data { + struct spi_device *spi; + struct regmap *map; + struct device *dev; + struct gpio_chip gc; + unsigned long gpio_valid_mask; + unsigned int vref_mv; + struct spi_transfer read_xfer[2]; + struct spi_transfer write_xfer; + struct spi_message read_msg; + struct spi_message write_msg; + /* 16-bit TX, valid data in high byte */ + u8 read_tx[2] __aligned(IIO_DMA_MINALIGN); + /* 8-bit address followed by 8-bit data */ + u8 reg_write_tx[2]; + /* 12-bit of ADC data or 8 bit of reg data */ + __be16 read_rx; +}; + +/* + * The ADC data is read issuing SPI-command matching the channel number. + * We treat this as a register address. + */ +#define BD79112_REG_AGIO0A 0x00 +#define BD79112_REG_AGIO15B 0x1f + +/* + * ADC STATUS_FLAG appended to ADC data will be set, if the ADC result is = being + * read for a channel, which input pin is muxed to be a GPIO. + */ +#define BD79112_ADC_STATUS_FLAG BIT(14) + +/* + * The BD79112 requires "R/W bit" to be set for SPI register (not ADC data) + * reads and an "IO bit" to be set for read/write operations (which aren't + * reading the ADC data). + */ +#define BD79112_BIT_RW BIT(4) +#define BD79112_BIT_IO BIT(5) + +/* + * The data-sheet explains register I/O communication as follows: + * + * Read, two 16-bit sequences separated by CSB: + * MOSI: + * SCK: | 1 | 2 | 3 | 4 | 5 .. 8 | 9 .. 16 | + * data:| 0 | 0 |IOSET| RW (1) | ADDR | 8'b0 | + * + * MISO: + * SCK: | 1 .. 8 | 9 .. 16 | + * data:| 8'b0 | data | + * + * Note, CSB is shown to be released between writing the address (MOSI) and + * reading the register data (MISO). + * + * Write, single 16-bit sequence: + * MOSI: + * SCK: | 1 | 2 | 3 | 4 | 5 .. 8 | + * data:| 0 | 0 |IOSET| RW(0) | ADDR | + * + * MISO: + * SCK: | 1 .. 8 | + * data:| data | + */ + +#define BD79112_REG_GPI_VALUE_B8_15 (BD79112_BIT_IO | 0x0) +#define BD79112_REG_GPI_VALUE_B0_B7 (BD79112_BIT_IO | 0x1) +#define BD79112_REG_GPI_VALUE_A8_15 (BD79112_BIT_IO | 0x2) +#define BD79112_REG_GPI_VALUE_A0_A7 (BD79112_BIT_IO | 0x3) + +#define BD79112_REG_GPI_EN_B7_B15 (BD79112_BIT_IO | 0x4) +#define BD79112_REG_GPI_EN_B0_B7 (BD79112_BIT_IO | 0x5) +#define BD79112_REG_GPI_EN_A8_A15 (BD79112_BIT_IO | 0x6) +#define BD79112_REG_GPI_EN_A0_A7 (BD79112_BIT_IO | 0x7) + +#define BD79112_REG_GPO_EN_B7_B15 (BD79112_BIT_IO | 0x8) +#define BD79112_REG_GPO_EN_B0_B7 (BD79112_BIT_IO | 0x9) +#define BD79112_REG_GPO_EN_A8_A15 (BD79112_BIT_IO | 0xa) +#define BD79112_REG_GPO_EN_A0_A7 (BD79112_BIT_IO | 0xb) + +#define BD79112_NUM_GPIO_EN_REGS 8 +#define BD79112_FIRST_GPIO_EN_REG BD79112_REG_GPI_EN_B7_B15 + +#define BD79112_REG_GPO_VALUE_B8_15 (BD79112_BIT_IO | 0xc) +#define BD79112_REG_GPO_VALUE_B0_B7 (BD79112_BIT_IO | 0xd) +#define BD79112_REG_GPO_VALUE_A8_15 (BD79112_BIT_IO | 0xe) +#define BD79112_REG_GPO_VALUE_A0_A7 (BD79112_BIT_IO | 0xf) + +#define BD79112_REG_MAX BD79112_REG_GPO_VALUE_A0_A7 + +static int _get_gpio_reg(unsigned int offset, unsigned int base) +{ + int regoffset =3D offset / 8; + + if (offset > 31 || offset < 0) + return -EINVAL; + + return base - regoffset; +} + +#define GET_GPIO_BIT(offset) BIT((offset) % 8) +#define GET_GPO_EN_REG(offset) _get_gpio_reg((offset), BD79112_REG_GPO_EN= _A0_A7) +#define GET_GPI_EN_REG(offset) _get_gpio_reg((offset), BD79112_REG_GPI_EN= _A0_A7) +#define GET_GPO_VAL_REG(offset) _get_gpio_reg((offset), BD79112_REG_GPO_V= ALUE_A0_A7) +#define GET_GPI_VAL_REG(offset) _get_gpio_reg((offset), BD79112_REG_GPI_V= ALUE_A0_A7) + +static const struct regmap_range bd71815_volatile_ro_ranges[] =3D { + { + /* Read ADC data */ + .range_min =3D BD79112_REG_AGIO0A, + .range_max =3D BD79112_REG_AGIO15B, + }, { + /* GPI state */ + .range_min =3D BD79112_REG_GPI_VALUE_B8_15, + .range_max =3D BD79112_REG_GPI_VALUE_A0_A7, + }, +}; + +static const struct regmap_access_table bd79112_volatile_regs =3D { + .yes_ranges =3D &bd71815_volatile_ro_ranges[0], + .n_yes_ranges =3D ARRAY_SIZE(bd71815_volatile_ro_ranges), +}; + +static const struct regmap_access_table bd79112_ro_regs =3D { + .no_ranges =3D &bd71815_volatile_ro_ranges[0], + .n_no_ranges =3D ARRAY_SIZE(bd71815_volatile_ro_ranges), +}; + +static int bd79112_reg_read(void *context, unsigned int reg, unsigned int = *val) +{ + struct bd79112_data *data =3D context; + int ret; + + if (reg & BD79112_BIT_IO) + reg |=3D BD79112_BIT_RW; + + data->read_tx[0] =3D reg; + + ret =3D spi_sync(data->spi, &data->read_msg); + if (!ret) + *val =3D be16_to_cpu(data->read_rx); + + if (reg & BD79112_BIT_IO && *val & BD79112_ADC_STATUS_FLAG) + dev_err(data->dev, "ADC pin configured as GPIO\n"); + + return ret; +} + +static int bd79112_reg_write(void *context, unsigned int reg, unsigned int= val) +{ + struct bd79112_data *data =3D context; + + data->reg_write_tx[0] =3D reg; + data->reg_write_tx[1] =3D val; + + return spi_sync(data->spi, &data->write_msg); +} + +static const struct regmap_config bd79112_regmap =3D { + .reg_read =3D bd79112_reg_read, + .reg_write =3D bd79112_reg_write, + .volatile_table =3D &bd79112_volatile_regs, + .wr_table =3D &bd79112_ro_regs, + .cache_type =3D REGCACHE_MAPLE, + .max_register =3D BD79112_REG_MAX, +}; + +static int bd79112_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, int *val, + int *val2, long m) +{ + struct bd79112_data *data =3D iio_priv(indio_dev); + int ret; + + switch (m) { + case IIO_CHAN_INFO_RAW: + ret =3D regmap_read(data->map, chan->channel, val); + if (ret < 0) + return ret; + + return IIO_VAL_INT; + + case IIO_CHAN_INFO_SCALE: + *val =3D data->vref_mv; + *val2 =3D 12; + + return IIO_VAL_FRACTIONAL_LOG2; + default: + return -EINVAL; + } + +} + +static const struct iio_info bd79112_info =3D { + .read_raw =3D bd79112_read_raw, +}; + +static const struct iio_chan_spec bd79112_chan_template =3D { + .type =3D IIO_VOLTAGE, + .info_mask_separate =3D BIT(IIO_CHAN_INFO_RAW), + .info_mask_shared_by_type =3D BIT(IIO_CHAN_INFO_SCALE), + .indexed =3D 1, +}; + +static int bd79112_gpio_init_valid_mask(struct gpio_chip *gc, + unsigned long *valid_mask, + unsigned int ngpios) +{ + struct bd79112_data *data =3D gpiochip_get_data(gc); + + *valid_mask =3D data->gpio_valid_mask; + + return 0; +} + +static int bd79112_gpio_dir_get(struct gpio_chip *gc, unsigned int offset) +{ + struct bd79112_data *data =3D gpiochip_get_data(gc); + unsigned int reg, bit, val; + int ret; + + bit =3D GET_GPIO_BIT(offset); + reg =3D GET_GPO_EN_REG(offset); + + ret =3D regmap_read(data->map, reg, &val); + if (ret) + return ret; + + if (bit & val) + return GPIO_LINE_DIRECTION_OUT; + + reg =3D GET_GPI_EN_REG(offset); + ret =3D regmap_read(data->map, reg, &val); + if (ret) + return ret; + + if (bit & val) + return GPIO_LINE_DIRECTION_IN; + + /* + * Ouch. Seems the pin is ADC input - shouldn't happen as changing mux + * at runtime is not supported and non GPIO pins should be invalidated + * by the valid_mask at probe. Maybe someone wrote register bypassing + * the driver? + */ + dev_err(data->dev, "Pin not a GPIO\n"); + + return -EINVAL; +} + +static int bd79112_gpio_get(struct gpio_chip *gc, unsigned int offset) +{ + struct bd79112_data *data =3D gpiochip_get_data(gc); + unsigned int reg, bit, val; + int ret; + + bit =3D GET_GPIO_BIT(offset); + reg =3D GET_GPI_VAL_REG(offset); + + ret =3D regmap_read(data->map, reg, &val); + if (ret) + return ret; + + return !!(val & bit); +} + +static int bd79112_gpio_set(struct gpio_chip *gc, unsigned int offset, + int value) +{ + struct bd79112_data *data =3D gpiochip_get_data(gc); + unsigned int reg, bit; + + bit =3D GET_GPIO_BIT(offset); + reg =3D GET_GPO_VAL_REG(offset); + + return regmap_assign_bits(data->map, reg, bit, value); +} + +static int bd79112_gpio_set_multiple(struct gpio_chip *gc, unsigned long *= mask, + unsigned long *bits) +{ + struct bd79112_data *data =3D gpiochip_get_data(gc); + unsigned long i, bank_mask; + + for_each_set_clump8(i, bank_mask, mask, /* gc->ngpio */ 32) { + unsigned long bank_bits; + unsigned int reg; + int ret; + + if (bank_mask) { + bank_bits =3D bitmap_get_value8(bits, i); + reg =3D BD79112_REG_GPO_VALUE_A0_A7 - i / 8; + ret =3D regmap_update_bits(data->map, reg, bank_mask, + bank_bits); + if (ret) + return ret; + } + } + + return 0; +} + +static int bd79112_gpio_dir_set(struct bd79112_data *data, unsigned int of= fset, + int dir) +{ + unsigned int gpi_reg, gpo_reg, bit; + int ret; + + bit =3D GET_GPIO_BIT(offset); + gpi_reg =3D GET_GPI_EN_REG(offset); + gpo_reg =3D GET_GPO_EN_REG(offset); + + if (dir =3D=3D GPIO_LINE_DIRECTION_OUT) { + ret =3D regmap_clear_bits(data->map, gpi_reg, bit); + if (ret) + return ret; + + return regmap_set_bits(data->map, gpo_reg, bit); + } + + ret =3D regmap_set_bits(data->map, gpi_reg, bit); + if (ret) + return ret; + + return regmap_clear_bits(data->map, gpo_reg, bit); +} + +static int bd79112_gpio_input(struct gpio_chip *gc, unsigned int offset) +{ + struct bd79112_data *data =3D gpiochip_get_data(gc); + + return bd79112_gpio_dir_set(data, offset, GPIO_LINE_DIRECTION_IN); +} + +static int bd79112_gpio_output(struct gpio_chip *gc, unsigned int offset, + int value) +{ + struct bd79112_data *data =3D gpiochip_get_data(gc); + int ret; + + ret =3D bd79112_gpio_set(gc, offset, value); + if (ret) + return ret; + + return bd79112_gpio_dir_set(data, offset, GPIO_LINE_DIRECTION_OUT); +} + +static const struct gpio_chip bd79112_gpio_chip =3D { + .label =3D "bd79112-gpio", + .get_direction =3D bd79112_gpio_dir_get, + .direction_input =3D bd79112_gpio_input, + .direction_output =3D bd79112_gpio_output, + .get =3D bd79112_gpio_get, + .set =3D bd79112_gpio_set, + .set_multiple =3D bd79112_gpio_set_multiple, + .init_valid_mask =3D bd79112_gpio_init_valid_mask, + .can_sleep =3D true, + .ngpio =3D 32, + .base =3D -1, +}; + +static int bd79112_get_gpio_pins(const struct iio_chan_spec *cs, int num_c= hannels) +{ + int i, gpio_channels; + + /* + * Let's initialize the mux config to say that all 32 channels are + * GPIOs. Then we can just loop through the iio_chan_spec and clear the + * bits for found ADC channels. + */ + gpio_channels =3D GENMASK(31, 0); + for (i =3D 0; i < num_channels; i++) + gpio_channels &=3D ~BIT(cs[i].channel); + + return gpio_channels; +} + +/* ADC channels as named in the data-sheet */ +static const char * const bd79112_chan_names[] =3D { + "AGIO0A", "AGIO1A", "AGIO2A", "AGIO3A", "AGIO4A", /* 0 - 4 */ + "AGIO5A", "AGIO6A", "AGIO7A", "AGIO8A", "AGIO9A", /* 5 - 9 */ + "AGIO10A", "AGIO11A", "AGIO12A", "AGIO13A", "AGIO14A", /* 10 - 14 */ + "AGIO15A", "AGIO0B", "AGIO1B", "AGIO2B", "AGIO3B", /* 15 - 19 */ + "AGIO4B", "AGIO5B", "AGIO6B", "AGIO7B", "AGIO8B", /* 20 - 24 */ + "AGIO9B", "AGIO10B", "AGIO11B", "AGIO12B", "AGIO13B", /* 25 - 29 */ + "AGIO14B", "AGIO15B", /* 30 - 31 */ +}; + +static int bd79112_probe(struct spi_device *spi) +{ + struct bd79112_data *data; + struct iio_dev *iio_dev; + struct iio_chan_spec *cs; + struct device *dev =3D &spi->dev; + unsigned long gpio_pins, pin; + unsigned int i; + int ret; + + iio_dev =3D devm_iio_device_alloc(dev, sizeof(*data)); + if (!iio_dev) + return -ENOMEM; + + data =3D iio_priv(iio_dev); + data->spi =3D spi; + data->dev =3D dev; + data->map =3D devm_regmap_init(&spi->dev, NULL, data, &bd79112_regmap); + if (IS_ERR(data->map)) + return dev_err_probe(dev, PTR_ERR(data->map), + "Failed to initialize Regmap\n"); + + ret =3D devm_regulator_get_enable_read_voltage(dev, "vdd"); + if (ret < 0) + return dev_err_probe(dev, ret, "Failed to get the Vdd\n"); + + data->vref_mv =3D ret / 1000; + + ret =3D devm_regulator_get_enable(dev, "iovdd"); + if (ret < 0) + return dev_err_probe(dev, ret, "Failed to enable I/O voltage\n"); + + data->read_xfer[0].tx_buf =3D &data->read_tx[0]; + data->read_xfer[0].len =3D sizeof(data->read_tx); + data->read_xfer[0].cs_change =3D 1; + data->read_xfer[1].rx_buf =3D &data->read_rx; + data->read_xfer[1].len =3D sizeof(data->read_rx); + spi_message_init_with_transfers(&data->read_msg, data->read_xfer, 2); + + data->write_xfer.tx_buf =3D &data->reg_write_tx[0]; + data->write_xfer.len =3D sizeof(data->reg_write_tx); + spi_message_init_with_transfers(&data->write_msg, &data->write_xfer, 1); + + ret =3D devm_iio_adc_device_alloc_chaninfo_se(dev, &bd79112_chan_template, + BD79112_MAX_NUM_CHANNELS - 1, + &cs); + if (ret < 0) { + /* Register all pins as GPIOs if there are no ADC channels */ + if (ret =3D=3D -ENOENT) + goto register_gpios; + + return ret; + } + + iio_dev->num_channels =3D ret; + iio_dev->channels =3D cs; + + /* Let's assign data-sheet names to channels */ + for (i =3D 0; i < iio_dev->num_channels; i++) { + unsigned int ch =3D cs[i].channel; + + cs[i].datasheet_name =3D bd79112_chan_names[ch]; + } + + iio_dev->info =3D &bd79112_info; + iio_dev->name =3D "bd79112"; + iio_dev->modes =3D INDIO_DIRECT_MODE; + + /* + * Ensure all channels are ADCs. This allows us to register the IIO + * device early (before checking which pins are to be used for GPIO) + * without having to worry about some pins being initially used for + * GPIO. + */ + for (i =3D 0; i < BD79112_NUM_GPIO_EN_REGS; i++) { + ret =3D regmap_write(data->map, BD79112_FIRST_GPIO_EN_REG + i, 0); + if (ret) + return dev_err_probe(dev, ret, + "Failed to initialize channels\n"); + } + + ret =3D devm_iio_device_register(data->dev, iio_dev); + if (ret) + return dev_err_probe(data->dev, ret, "Failed to register ADC\n"); + +register_gpios: + gpio_pins =3D bd79112_get_gpio_pins(iio_dev->channels, + iio_dev->num_channels); + + /* If all channels are reserved for ADC, then we're done. */ + if (!gpio_pins) + return 0; + + /* Default all the GPIO pins to GPI */ + for_each_set_bit(pin, &gpio_pins, BD79112_MAX_NUM_CHANNELS) { + ret =3D bd79112_gpio_dir_set(data, pin, GPIO_LINE_DIRECTION_IN); + if (ret) + return dev_err_probe(dev, ret, + "Failed to mark pin as GPI\n"); + } + + data->gpio_valid_mask =3D gpio_pins; + data->gc =3D bd79112_gpio_chip; + data->gc.parent =3D dev; + + return devm_gpiochip_add_data(dev, &data->gc, data); +} + +static const struct of_device_id bd79112_of_match[] =3D { + { .compatible =3D "rohm,bd79112" }, + { } +}; +MODULE_DEVICE_TABLE(of, bd79112_of_match); + +static const struct spi_device_id bd79112_id[] =3D { + { "bd79112" }, + { } +}; +MODULE_DEVICE_TABLE(spi, bd79112_id); + +static struct spi_driver bd79112_driver =3D { + .driver =3D { + .name =3D "bd79112", + .of_match_table =3D bd79112_of_match, + }, + .probe =3D bd79112_probe, + .id_table =3D bd79112_id, +}; +module_spi_driver(bd79112_driver); + +MODULE_AUTHOR("Matti Vaittinen "); +MODULE_DESCRIPTION("Driver for ROHM BD79112 ADC/GPIO"); +MODULE_LICENSE("GPL"); +MODULE_IMPORT_NS("IIO_DRIVER"); --=20 2.51.0 --p2j7jxvmv06+tZC6 Content-Type: application/pgp-signature; name=signature.asc -----BEGIN PGP SIGNATURE----- iQEzBAEBCgAdFiEEIx+f8wZb28fLKEhTeFA3/03aocUFAmi5h94ACgkQeFA3/03a ocW2Igf/Q3Kj5CBW7DB3GuzI/or9wLfLrUWrncUx6A8EOk3N9JU/9lO4ZEfl601s vPj0f3L8HfnZL0WOgRNsNLCIznTTjEdO7lgYyil3KmpKPuKiiikl/I5HkPjm4KIO xqtGSkmAalX6FzYn929rsQrGEazE0KxhF1kZnmapfdg+lKkAfYYOfbcPc7VfBLBE Wo6KhS+hCJbUd1ChZqWgaAX7mndfepgLJFbyFqhncafUVFdobcZDySDDqDxcL1Bk sZPxJF/BS7rwSXw+9VmqZbT3rhbJ04a4ks/aZ09qqwLQ1yRx4AYnb22WuhI+IwBa 0sv/WEFsO/XYq41+BABT8B1n/mdAIw== =GMz0 -----END PGP SIGNATURE----- --p2j7jxvmv06+tZC6-- From nobody Fri Oct 3 05:25:21 2025 Received: from mail-lf1-f52.google.com (mail-lf1-f52.google.com [209.85.167.52]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0A1662F3C21; 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Thu, 04 Sep 2025 05:37:09 -0700 (PDT) Received: from mva-rohm ([213.255.186.37]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-5608ab928fesm1151046e87.37.2025.09.04.05.37.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 04 Sep 2025 05:37:08 -0700 (PDT) Date: Thu, 4 Sep 2025 15:37:05 +0300 From: Matti Vaittinen To: Matti Vaittinen , Matti Vaittinen Cc: Jonathan Cameron , David Lechner , Nuno =?iso-8859-1?Q?S=E1?= , Andy Shevchenko , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Matti Vaittinen , Linus Walleij , Bartosz Golaszewski , Marcelo Schmitt , Javier Carrasco , Tobias Sperling , Antoniu Miclaus , Trevor Gamblin , Esteban Blanc , Herve Codina , Ramona Alexandra Nechita , Eason Yang , Pop Ioan Daniel , linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org Subject: [PATCH v2 3/3] MAINTAINERS: Support ROHM BD79112 ADC Message-ID: <7c7e8e80e128d2eace1c1632de4315de3df5e8bd.1756988028.git.mazziesaccount@gmail.com> References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="baTTKEtKJ7KAcghN" Content-Disposition: inline In-Reply-To: --baTTKEtKJ7KAcghN Content-Disposition: inline Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Add the ROHM BD79112 ADC in the list of the BD791xx ADC drivers which are maintained by undersigned. Signed-off-by: Matti Vaittinen --- Revision history: v1 =3D> : - no changes --- MAINTAINERS | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/MAINTAINERS b/MAINTAINERS index af1c8d2bfb3d..8e78a1168c17 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -21864,9 +21864,10 @@ S: Supported F: drivers/power/supply/bd99954-charger.c F: drivers/power/supply/bd99954-charger.h =20 -ROHM BD79124 ADC / GPO IC +ROHM BD791xx ADC / GPO IC M: Matti Vaittinen S: Supported +F: drivers/iio/adc/rohm-bd79112.c F: drivers/iio/adc/rohm-bd79124.c =20 ROHM BH1745 COLOUR SENSOR --=20 2.51.0 --baTTKEtKJ7KAcghN Content-Type: application/pgp-signature; name=signature.asc -----BEGIN PGP SIGNATURE----- iQEzBAEBCgAdFiEEIx+f8wZb28fLKEhTeFA3/03aocUFAmi5h/EACgkQeFA3/03a ocUxwAf9EYjDUo85Y8rxE5OLosjz9/BzWTPZjcx8ZIQn+G40FUS5RKDLmfbyu+XE RAdiv21ezKNDQkgSboq5J5w0lc+st5eHvcWDPJ5ZgecCFyvAVRV6jrFz5qKlTnX/ YNZYqDXVvAi9unpDSLpc5HXKUNeugbKBa1PpIuE6uLcMmSO00MBwG1jlBQiFlG4I dv0+UDKQGwRXpAvW8T2d3ZdmjkFp3IrNbnLPxXQBTA8cyAh3l0jggFrcqhRSqg3N E8glw4Fa9iALJN8U7vy/jtyjbbP4wNSCgL6htuxDmhahpTVx23ACRd9lZH5FjNSM V3ySUCKMHnIRSgCrPGXyuSs182ZLkA== =yme7 -----END PGP SIGNATURE----- --baTTKEtKJ7KAcghN--