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Thu, 21 May 2026 01:08:04 -0700 (PDT) From: Neil Armstrong Date: Thu, 21 May 2026 10:08:00 +0200 Subject: [PATCH v4 1/2] dt-bindings: leds: backlight: document the SY7758 6-channel High Efficiency LED 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: <20260521-topic-sm8650-ayaneo-pocket-s2-sy7758-v4-1-73c732615e4a@linaro.org> References: <20260521-topic-sm8650-ayaneo-pocket-s2-sy7758-v4-0-73c732615e4a@linaro.org> In-Reply-To: <20260521-topic-sm8650-ayaneo-pocket-s2-sy7758-v4-0-73c732615e4a@linaro.org> To: Lee Jones , Daniel Thompson , Jingoo Han , Pavel Machek , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Helge Deller Cc: dri-devel@lists.freedesktop.org, linux-leds@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fbdev@vger.kernel.org, KancyJoe , Neil Armstrong , Krzysztof Kozlowski X-Mailer: b4 0.15.1 X-Developer-Signature: v=1; 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a=openpgp; fpr=89EC3D058446217450F22848169AB7B1A4CFF8AE Document the Silergy SY7758 6-channel High Efficiency LED Driver used for backlight brightness control. Reviewed-by: Krzysztof Kozlowski Signed-off-by: Neil Armstrong --- .../bindings/leds/backlight/silergy,sy7758.yaml | 53 ++++++++++++++++++= ++++ 1 file changed, 53 insertions(+) diff --git a/Documentation/devicetree/bindings/leds/backlight/silergy,sy775= 8.yaml b/Documentation/devicetree/bindings/leds/backlight/silergy,sy7758.ya= ml new file mode 100644 index 000000000000..80e978d691c2 --- /dev/null +++ b/Documentation/devicetree/bindings/leds/backlight/silergy,sy7758.yaml @@ -0,0 +1,53 @@ +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/leds/backlight/silergy,sy7758.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Silergy SY7758 6-channel High Efficiency LED Driver + +maintainers: + - Neil Armstrong + +description: + Silergy SY7758 is a high efficiency 6-channels LED backlight + driver with I2C brightness control. + +allOf: + - $ref: common.yaml# + +properties: + compatible: + const: silergy,sy7758 + + reg: + maxItems: 1 + + vddio-supply: true + + enable-gpios: + maxItems: 1 + +required: + - compatible + - reg + - vddio-supply + - enable-gpios + +unevaluatedProperties: false + +examples: + - | + #include + + i2c { + #address-cells =3D <1>; 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Thu, 21 May 2026 01:08:05 -0700 (PDT) From: Neil Armstrong Date: Thu, 21 May 2026 10:08:01 +0200 Subject: [PATCH v4 2/2] backlight: Add SY7758 6-channel High Efficiency LED Driver support 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: <20260521-topic-sm8650-ayaneo-pocket-s2-sy7758-v4-2-73c732615e4a@linaro.org> References: <20260521-topic-sm8650-ayaneo-pocket-s2-sy7758-v4-0-73c732615e4a@linaro.org> In-Reply-To: <20260521-topic-sm8650-ayaneo-pocket-s2-sy7758-v4-0-73c732615e4a@linaro.org> To: Lee Jones , Daniel Thompson , Jingoo Han , Pavel Machek , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Helge Deller Cc: dri-devel@lists.freedesktop.org, linux-leds@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fbdev@vger.kernel.org, KancyJoe , Neil Armstrong X-Mailer: b4 0.15.1 X-Developer-Signature: v=1; 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a=openpgp; fpr=89EC3D058446217450F22848169AB7B1A4CFF8AE From: KancyJoe Implement support for the Silergy SY7758 6-channel High Efficiency LED Driver used for backlight brightness control in the Ayaneo Pocket S2 dual-DSI panel. Signed-off-by: KancyJoe Signed-off-by: Neil Armstrong --- drivers/video/backlight/Kconfig | 8 ++ drivers/video/backlight/Makefile | 1 + drivers/video/backlight/sy7758.c | 259 +++++++++++++++++++++++++++++++++++= ++++ 3 files changed, 268 insertions(+) diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kcon= fig index a7a3fbaf7c29..a1f70a2bae99 100644 --- a/drivers/video/backlight/Kconfig +++ b/drivers/video/backlight/Kconfig @@ -207,6 +207,14 @@ config BACKLIGHT_KTZ8866 Say Y to enable the backlight driver for the Kinetic KTZ8866 found in Xiaomi Mi Pad 5 series. =20 +config BACKLIGHT_SY7758 + tristate "Backlight Driver for Silergy SY7758" + depends on I2C + select REGMAP_I2C + help + Say Y to enable the backlight driver for the Silergy SY7758 + backlight controller found in Ayaneo Pocket S2. + config BACKLIGHT_LM3533 tristate "Backlight Driver for LM3533" depends on MFD_LM3533 diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Mak= efile index 794820a98ed4..39ef588b1cf2 100644 --- a/drivers/video/backlight/Makefile +++ b/drivers/video/backlight/Makefile @@ -56,6 +56,7 @@ obj-$(CONFIG_BACKLIGHT_PWM) +=3D pwm_bl.o obj-$(CONFIG_BACKLIGHT_QCOM_WLED) +=3D qcom-wled.o obj-$(CONFIG_BACKLIGHT_RT4831) +=3D rt4831-backlight.o obj-$(CONFIG_BACKLIGHT_SAHARA) +=3D kb3886_bl.o +obj-$(CONFIG_BACKLIGHT_SY7758) +=3D sy7758.o obj-$(CONFIG_BACKLIGHT_SKY81452) +=3D sky81452-backlight.o obj-$(CONFIG_BACKLIGHT_TPS65217) +=3D tps65217_bl.o obj-$(CONFIG_BACKLIGHT_WM831X) +=3D wm831x_bl.o diff --git a/drivers/video/backlight/sy7758.c b/drivers/video/backlight/sy7= 758.c new file mode 100644 index 000000000000..198d55939438 --- /dev/null +++ b/drivers/video/backlight/sy7758.c @@ -0,0 +1,259 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Silergy SY7758 6-channel High Efficiency LED Driver + * + * Copyright (C) 2025 Kancy Joe + * Copyright (C) 2026 Linaro Limited + * Author: Neil Armstrong + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define DEFAULT_BRIGHTNESS 1024 +#define MAX_BRIGHTNESS 4080 +#define REG_MAX 0xAE + +/* Registers */ +#define REG_DEV_CTL 0x01 +#define REG_DEV_ID 0x03 +#define REG_BRT_12BIT_L 0x10 +#define REG_BRT_12BIT_H 0x11 + +/* OTP memory */ +#define REG_OTP_CFG0 0xA0 +#define REG_OTP_CFG1 0xA1 +#define REG_OTP_CFG2 0xA2 +#define REG_OTP_CFG5 0xA5 +#define REG_OTP_CFG9 0xA9 + +/* Fields */ +#define BIT_DEV_CTL_FAST BIT(7) +#define MSK_DEV_CTL_BRT_MODE GENMASK(2, 1) +#define BIT_DEV_CTL_BL_CTLB BIT(0) + +#define MSK_BRT_12BIT_L GENMASK(7, 0) +#define MSK_BRT_12BIT_H GENMASK(3, 0) + +#define MSK_CFG0_CURRENT_LOW GENMASK(7, 0) + +#define BIT_CFG1_PDET_STDBY BIT(7) +#define MSK_CFG1_CURRENT_MAX GENMASK(6, 4) +#define MSK_CFG1_CURRENT_HIGH GENMASK(3, 0) + +#define BIT_CFG2_UVLO_EN BIT(5) +#define BIT_CFG2_UVLO_TH BIT(4) +#define BIT_CFG2_BL_ON BIT(3) +#define BIT_CFG2_ISET_EN BIT(2) +#define BIT_CFG2_BST_ESET_EN BIT(1) + +#define BIT_CFG5_PWM_DIRECT BIT(7) +#define MSK_CFG5_PS_MODE GENMASK(6, 4) +#define MSK_CFG5_PWM_FREQ GENMASK(3, 0) + +#define MSK_CFG9_VBST_MAX GENMASK(7, 5) +#define BIT_CFG9_JUMP_EN BIT(4) +#define MSK_CFG9_JUMP_TH GENMASK(3, 2) +#define MSK_CFG9_JUMP_VOLTAGE GENMASK(1, 0) + +struct sy7758 { + struct i2c_client *client; + struct regmap *regmap; + struct gpio_desc *gpio; + struct backlight_device *bl; +}; + +static const struct regmap_config sy7758_regmap_config =3D { + .reg_bits =3D 8, + .val_bits =3D 8, + .max_register =3D REG_MAX, +}; + +static int sy7758_backlight_update_status(struct backlight_device *backlig= ht_dev) +{ + struct sy7758 *sydev =3D bl_get_data(backlight_dev); + unsigned int brightness =3D backlight_get_brightness(backlight_dev); + int ret; + + ret =3D regmap_write(sydev->regmap, REG_BRT_12BIT_L, + FIELD_PREP(MSK_BRT_12BIT_L, + brightness & 0xff)); + if (ret) + return ret; + + ret =3D regmap_write(sydev->regmap, REG_BRT_12BIT_H, + FIELD_PREP(MSK_BRT_12BIT_H, + (brightness >> 8) & 0xf)); + if (ret) + return ret; + + return 0; +} + +static const struct backlight_ops sy7758_backlight_ops =3D { + .options =3D BL_CORE_SUSPENDRESUME, + .update_status =3D sy7758_backlight_update_status, +}; + +static int sy7758_init(struct sy7758 *sydev) +{ + int ret =3D 0; + + ret =3D regmap_write(sydev->regmap, REG_DEV_CTL, + BIT_DEV_CTL_FAST | BIT_DEV_CTL_BL_CTLB | + FIELD_PREP(MSK_DEV_CTL_BRT_MODE, 2)); + if (ret) + return ret; + + ret =3D regmap_write(sydev->regmap, REG_BRT_12BIT_L, + FIELD_PREP(MSK_BRT_12BIT_L, + DEFAULT_BRIGHTNESS & 0xff)); + if (ret) + return ret; + + ret =3D regmap_write(sydev->regmap, REG_BRT_12BIT_H, + FIELD_PREP(MSK_BRT_12BIT_H, + (DEFAULT_BRIGHTNESS >> 8))); + if (ret) + return ret; + + ret =3D regmap_write(sydev->regmap, REG_OTP_CFG5, + FIELD_PREP(MSK_CFG5_PS_MODE, 6) | + FIELD_PREP(MSK_CFG5_PWM_FREQ, 4)); + if (ret) + return ret; + + ret =3D regmap_write(sydev->regmap, REG_OTP_CFG0, + FIELD_PREP(MSK_CFG0_CURRENT_LOW, 85)); + if (ret) + return ret; + + ret =3D regmap_write(sydev->regmap, REG_OTP_CFG1, + BIT_CFG1_PDET_STDBY | + FIELD_PREP(MSK_CFG1_CURRENT_MAX, 1) | + FIELD_PREP(MSK_CFG1_CURRENT_HIGH, 10)); + if (ret) + return ret; + + ret =3D regmap_write(sydev->regmap, REG_OTP_CFG9, + FIELD_PREP(MSK_CFG9_VBST_MAX, 4)); + if (ret) + return ret; + + ret =3D regmap_write(sydev->regmap, REG_OTP_CFG2, + BIT_CFG2_BL_ON | BIT_CFG2_UVLO_EN); + if (ret) + return ret; + + return 0; +} + +static int sy7758_probe(struct i2c_client *client) +{ + struct backlight_properties props =3D { }; + struct device *dev =3D &client->dev; + struct sy7758 *sydev; + unsigned int dev_id; + int ret; + + sydev =3D devm_kzalloc(dev, sizeof(*sydev), GFP_KERNEL); + if (!sydev) + return -ENOMEM; + + i2c_set_clientdata(client, sydev); + + /* Initialize regmap */ + sydev->client =3D client; + sydev->regmap =3D devm_regmap_init_i2c(client, &sy7758_regmap_config); + if (IS_ERR(sydev->regmap)) + return dev_err_probe(dev, PTR_ERR(sydev->regmap), + "failed to init regmap\n"); + + /* Get and enable regulators */ + ret =3D devm_regulator_get_enable(dev, "vddio"); + if (ret) + return dev_err_probe(dev, ret, "failed to get regulator\n"); + + fsleep(100); + + /* Get enable GPIO and set to high */ + sydev->gpio =3D devm_gpiod_get(dev, "enable", GPIOD_OUT_HIGH); + if (IS_ERR(sydev->gpio)) + return dev_err_probe(dev, PTR_ERR(sydev->gpio), + "failed to get enable GPIO\n"); + + /* Let some time for HW to settle */ + fsleep(10000); + + /* try read and check device id */ + ret =3D regmap_read(sydev->regmap, REG_DEV_ID, &dev_id); + if (ret < 0) + return dev_err_probe(dev, ret, "failed to read device id\n"); + if (dev_id !=3D 0x63) { + dev_err(dev, "unexpected device id: 0x%02x\n", dev_id); + return -ENODEV; + } + + /* Initialize and set default brightness */ + ret =3D sy7758_init(sydev); + if (ret) + return ret; + + props.type =3D BACKLIGHT_RAW; + props.max_brightness =3D MAX_BRIGHTNESS; + props.brightness =3D DEFAULT_BRIGHTNESS; + props.scale =3D BACKLIGHT_SCALE_LINEAR; + + sydev->bl =3D devm_backlight_device_register(dev, "sy7758-backlight", + dev, sydev, &sy7758_backlight_ops, + &props); + if (IS_ERR(sydev->bl)) + return dev_err_probe(dev, PTR_ERR(sydev->bl), + "failed to register backlight device\n"); + + return backlight_update_status(sydev->bl); +} + +static void sy7758_remove(struct i2c_client *client) +{ + struct sy7758 *sydev =3D i2c_get_clientdata(client); + + backlight_disable(sydev->bl); +} + +static const struct i2c_device_id sy7758_ids[] =3D { + { "sy7758" }, + { } +}; +MODULE_DEVICE_TABLE(i2c, sy7758_ids); + +static const struct of_device_id sy7758_match_table[] =3D { + { .compatible =3D "silergy,sy7758", }, + { }, +}; +MODULE_DEVICE_TABLE(of, sy7758_match_table); + +static struct i2c_driver sy7758_driver =3D { + .driver =3D { + .name =3D "sy7758", + .of_match_table =3D sy7758_match_table, + }, + .probe =3D sy7758_probe, + .remove =3D sy7758_remove, + .id_table =3D sy7758_ids, +}; + +module_i2c_driver(sy7758_driver); + +MODULE_DESCRIPTION("Silergy SY7758 Backlight Driver"); +MODULE_AUTHOR("Kancy Joe "); +MODULE_AUTHOR("Neil Armstrong "); +MODULE_LICENSE("GPL"); --=20 2.34.1