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Tue, 01 Jul 2025 14:39:41 -0700 (PDT) From: David Lechner Date: Tue, 01 Jul 2025 16:37:58 -0500 Subject: [PATCH v3 10/12] spi: offload trigger: add ADI Util Sigma-Delta SPI driver Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250701-iio-adc-ad7173-add-spi-offload-support-v3-10-42abb83e3dac@baylibre.com> References: <20250701-iio-adc-ad7173-add-spi-offload-support-v3-0-42abb83e3dac@baylibre.com> In-Reply-To: <20250701-iio-adc-ad7173-add-spi-offload-support-v3-0-42abb83e3dac@baylibre.com> To: Michael Hennerich , Jonathan Cameron , =?utf-8?q?Nuno_S=C3=A1?= , Andy Shevchenko , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Mark Brown Cc: linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-spi@vger.kernel.org, David Lechner X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=4356; i=dlechner@baylibre.com; h=from:subject:message-id; bh=ODK9s/KesQY1q9pgllRcE+1udpiAQ4WyUQ8s8zoiSYI=; b=owEBbQGS/pANAwAKAcLMIAH/AY/AAcsmYgBoZFV9xeYLLeB0HZi/XyTdaJ2M2m8jxczPEsMWe 2lsSTjigEiJATMEAAEKAB0WIQTsGNmeYg6D1pzYaJjCzCAB/wGPwAUCaGRVfQAKCRDCzCAB/wGP wJv9CACborVMse/liFlC7Ut9b03+zhxm0nqzlgwfdEp+Q9qYaXvEGHwNlKfRENLS6CiW0+kLx49 YijGeDsUs3DUguHEFD1FhN8ntHvckuv4BNtPGtdcalA54FXimf588P4wOkVz2mUnVOv8IUJBUr3 JtJ7ZVXIcsa5RSOBAY2A2C23/GBHgayDKQ7KaW1Z4S6KPC3fvPGDksmTI/oq72DYJIMWbYDHMg5 x+Xi7rUxoLgzTV7bQKmwxIWhLwg76FKXwXm7nD4xaYb/QBGyPUpSb+IJOjVZDowdzmt/9jTpA/m uq8wAB+x/dT0LbzZnQsQvYyqAK7FUnkS1te3Iyrij1V8AgIZ X-Developer-Key: i=dlechner@baylibre.com; a=openpgp; fpr=8A73D82A6A1F509907F373881F8AF88C82F77C03 Add a new driver for the ADI Util Sigma-Delta SPI FPGA IP core. This is used to trigger a SPI offload based on a RDY signal from an ADC while masking out other signals on the same line. Signed-off-by: David Lechner --- MAINTAINERS | 2 +- drivers/spi/Kconfig | 5 ++ drivers/spi/Makefile | 1 + .../spi/spi-offload-trigger-adi-util-sigma-delta.c | 62 ++++++++++++++++++= ++++ 4 files changed, 69 insertions(+), 1 deletion(-) diff --git a/MAINTAINERS b/MAINTAINERS index 60ba572be7f5b48c0ab1d0d9724e19e335e8761b..4ed4977deb6ddc545be39b5c1d5= e9959e9fe64cf 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -23357,7 +23357,7 @@ F: include/linux/mtd/spi-nor.h =20 SPI OFFLOAD R: David Lechner -F: drivers/spi/spi-offload-trigger-pwm.c +F: drivers/spi/spi-offload-trigger-*.c F: drivers/spi/spi-offload.c F: include/linux/spi/offload/ K: spi_offload diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig index c51da3fc3604977b05388687e5e64a58370186c4..e69f060d3875c168a2dc701a372= e47b8ffd33268 100644 --- a/drivers/spi/Kconfig +++ b/drivers/spi/Kconfig @@ -1355,6 +1355,11 @@ if SPI_OFFLOAD =20 comment "SPI Offload triggers" =20 +config SPI_OFFLOAD_TRIGGER_ADI_UTIL_SD + tristate "SPI offload trigger using ADI sigma-delta utility" + help + SPI offload trigger from ADI sigma-delta utility FPGA IP block. + config SPI_OFFLOAD_TRIGGER_PWM tristate "SPI offload trigger using PWM" depends on PWM diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile index 4ea89f6fc531625060255ecff237470927e1f041..51f9f16ed734424ff10672a04f2= ec166dc637e0b 100644 --- a/drivers/spi/Makefile +++ b/drivers/spi/Makefile @@ -170,3 +170,4 @@ obj-$(CONFIG_SPI_SLAVE_SYSTEM_CONTROL) +=3D spi-slave-s= ystem-control.o =20 # SPI offload triggers obj-$(CONFIG_SPI_OFFLOAD_TRIGGER_PWM) +=3D spi-offload-trigger-pwm.o +obj-$(CONFIG_SPI_OFFLOAD_TRIGGER_ADI_UTIL_SD) +=3D spi-offload-trigger-adi= -util-sigma-delta.o diff --git a/drivers/spi/spi-offload-trigger-adi-util-sigma-delta.c b/drive= rs/spi/spi-offload-trigger-adi-util-sigma-delta.c new file mode 100644 index 0000000000000000000000000000000000000000..8468c773713a3d203b2e668f340= ee3f477b8fb6c --- /dev/null +++ b/drivers/spi/spi-offload-trigger-adi-util-sigma-delta.c @@ -0,0 +1,62 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2025 Analog Devices Inc. + * Copyright (C) 2025 BayLibre, SAS + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +static bool adi_util_sigma_delta_match(struct spi_offload_trigger *trigger, + enum spi_offload_trigger_type type, + u64 *args, u32 nargs) +{ + return type =3D=3D SPI_OFFLOAD_TRIGGER_DATA_READY && nargs =3D=3D 0; +} + +static const struct spi_offload_trigger_ops adi_util_sigma_delta_ops =3D { + .match =3D adi_util_sigma_delta_match, +}; + +static int adi_util_sigma_delta_probe(struct platform_device *pdev) +{ + struct device *dev =3D &pdev->dev; + struct spi_offload_trigger_info info =3D { + .fwnode =3D dev_fwnode(dev), + .ops =3D &adi_util_sigma_delta_ops, + }; + struct clk *clk; + + clk =3D devm_clk_get_enabled(dev, NULL); + if (IS_ERR(clk)) + return dev_err_probe(dev, PTR_ERR(clk), "Failed to get clock\n"); + + return devm_spi_offload_trigger_register(dev, &info); +} + +static const struct of_device_id adi_util_sigma_delta_of_match_table[] =3D= { + { .compatible =3D "adi,util-sigma-delta-spi", }, + { } +}; +MODULE_DEVICE_TABLE(of, adi_util_sigma_delta_of_match_table); + +static struct platform_driver adi_util_sigma_delta_driver =3D { + .probe =3D adi_util_sigma_delta_probe, + .driver =3D { + .name =3D "adi-util-sigma-delta-spi", + .of_match_table =3D adi_util_sigma_delta_of_match_table, + }, +}; +module_platform_driver(adi_util_sigma_delta_driver); + +MODULE_AUTHOR("David Lechner "); +MODULE_DESCRIPTION("ADI Sigma-Delta SPI offload trigger utility driver"); +MODULE_LICENSE("GPL"); --=20 2.43.0