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Thu, 30 Apr 2026 02:47:23 -0700 (PDT) Received: from arrakeen.starnux.net ([2a01:e0a:106d:1080:52eb:f6ff:feb3:451a]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-48a81b9493bsm48984745e9.0.2026.04.30.02.47.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 Apr 2026 02:47:23 -0700 (PDT) From: Neil Armstrong Date: Thu, 30 Apr 2026 11:47:16 +0200 Subject: [PATCH v2 2/2] backlight: Add SY7758 6-channel High Efficiency LED Driver support MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260430-topic-sm8650-ayaneo-pocket-s2-sy7758-v2-2-308140640de9@linaro.org> References: <20260430-topic-sm8650-ayaneo-pocket-s2-sy7758-v2-0-308140640de9@linaro.org> In-Reply-To: <20260430-topic-sm8650-ayaneo-pocket-s2-sy7758-v2-0-308140640de9@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; a=openpgp-sha256; l=10623; i=neil.armstrong@linaro.org; h=from:subject:message-id; bh=oLphRrYMc/i7SfmwTz1M2EuUqdpJ7AM0v6IBJaIdGes=; b=owEBbQKS/ZANAwAKAXfc29rIyEnRAcsmYgBp8yUoIF1IVAD+WKCk1PLMHraR26aN3AB9AE67gr2L BONsRneJAjMEAAEKAB0WIQQ9U8YmyFYF/h30LIt33NvayMhJ0QUCafMlKAAKCRB33NvayMhJ0Y77D/ 0ZSC96M1+wBb9Ix/L3K2H8VP1HmuMmIDGWIM+/vXOjOp/PMh/EjPC+uH+MQKPJN6jDaYYLqSEDlSKD gmSERMhi6N0AGv0NvmiAASXBJ2fjSKT9cCRKJmWSLytK9o9rXreSHYpqUx9ZdGH6+WviehfRUwcNAg ITGJBs+AugRBEmfkD+uQnehRzep2mQtbw/E6dpNpxPxJbkVEc9w/YhUZI3AocTiUBsFsG96LjKLMwW OD0iXQK9A1tb8zoFq3BOAT7nA1TQxSDhzla2TiMHiMq+xJFALLfYV3b1lfglkBEE+0HjQ85VtOu7zO YijnUCkoacdB5kcamrEjjiO9HnB9qo2/Mtxl9zQUUW9oLXz3KlIELy2gHftv+x6F8TjHEy2kyeBPNr U+mqOAA4gfLlFAazELGrjUOxvxOKz/cV8PW0aXA+Y18P4FE8bnicT2+JMst5MhbFOxchi85BoyNFl+ v48sCBVlBDMgfOtjTTkWj55sETlJ6O3irA+fEgMNz8ZcCjkuVsGY7AkCtBR+RXRuHnbMSv/23my9wg ntx8TVw3rj9/M6FGnMS3hiY+2iS+rjDTkgoCQCyMpRX7AzlhnJ6Wx6ANVsyTTHxklT7a7cCWP+8l4b kYCyhk/fsgJRqti0HRObx9TijfcpaPhHCjLcssxyXmOkLL9r8sqFD60kx+zA== X-Developer-Key: i=neil.armstrong@linaro.org; a=openpgp; fpr=89EC3D058446217450F22848169AB7B1A4CFF8AE X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" 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: Neil Armstrong Signed-off-by: KancyJoe --- drivers/video/backlight/Kconfig | 8 + drivers/video/backlight/Makefile | 1 + drivers/video/backlight/sy7758.c | 311 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 320 insertions(+) diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig index a7a3fbaf7c29..052ac80c8213 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. +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 Socket S2. + config BACKLIGHT_LM3533 tristate "Backlight Driver for LM3533" depends on MFD_LM3533 diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile index 794820a98ed4..39ef588b1cf2 100644 --- a/drivers/video/backlight/Makefile +++ b/drivers/video/backlight/Makefile @@ -56,6 +56,7 @@ obj-$(CONFIG_BACKLIGHT_PWM) += pwm_bl.o obj-$(CONFIG_BACKLIGHT_QCOM_WLED) += qcom-wled.o obj-$(CONFIG_BACKLIGHT_RT4831) += rt4831-backlight.o obj-$(CONFIG_BACKLIGHT_SAHARA) += kb3886_bl.o +obj-$(CONFIG_BACKLIGHT_SY7758) += sy7758.o obj-$(CONFIG_BACKLIGHT_SKY81452) += sky81452-backlight.o obj-$(CONFIG_BACKLIGHT_TPS65217) += tps65217_bl.o obj-$(CONFIG_BACKLIGHT_WM831X) += wm831x_bl.o diff --git a/drivers/video/backlight/sy7758.c b/drivers/video/backlight/sy7758.c new file mode 100644 index 000000000000..9b2d3bbb4ded --- /dev/null +++ b/drivers/video/backlight/sy7758.c @@ -0,0 +1,311 @@ +// 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 + +#define DEFAULT_BRIGHTNESS 1024 +#define MAX_BRIGHTNESS 4080 +#define REG_MAX 0xAE + +/* Registers */ +#define REG_BRT_8BIT 0x00 +#define REG_DEV_CTL 0x01 +#define REG_STATUS 0x02 +#define REG_DEV_ID 0x03 +#define REG_DIRECT_CTL 0x04 +#define REG_STATUS2 0x05 +#define REG_BRT_12BIT_L 0x10 +#define REG_BRT_12BIT_H 0x11 +#define REG_LED_ENABLE 0x16 + +/* OTP memory */ +#define REG_OTP_CFG98 0x98 +#define REG_OTP_CFG9E 0x9E +#define REG_OTP_CFG0 0xA0 +#define REG_OTP_CFG1 0xA1 +#define REG_OTP_CFG2 0xA2 +#define REG_OTP_CFG3 0xA3 +#define REG_OTP_CFG4 0xA4 +#define REG_OTP_CFG5 0xA5 +#define REG_OTP_CFG6 0xA6 +#define REG_OTP_CFG7 0xA7 +#define REG_OTP_CFG9 0xA9 +#define REG_OTP_CFGA 0xAA +#define REG_OTP_CFGE 0xAE + +/* 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 BIT_STATUS_OPEN BIT(7) +#define BIT_STATUS_SHORT BIT(6) +#define BIT_STATUS_VREF_OK BIT(5) +#define BIT_STATUS_VBST_OK BIT(4) +#define BIT_STATUS_OVP BIT(3) +#define BIT_STATUS_OCP BIT(2) +#define BIT_STATUS_TSD BIT(1) +#define BIT_STATUS_UVLO BIT(0) + +#define MSK_DIRECT_CTL_OUT GENMASK(5, 0) + +#define BIT_STATUS2_OCP50MS_LATCH BIT(0) +#define BIT_STATUS2_OCP2 BIT(0) + +#define MSK_BRT_12BIT_L GENMASK(7, 0) +#define MSK_BRT_12BIT_H GENMASK(3, 0) +#define MSK_LED_ENABLE GENMASK(5, 0) + +#define BIT_CFG98_IBST_LIM_2X BIT(7) +#define BIT_CFG98_A0_FSETB BIT(0) + +#define BIT_CFG9E_VBST_RANGE BIT(5) +#define MSK_CFG9E_HEADROOM_OFFSET 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 MSK_CFG3_SLOPE GENMASK(6, 4) +#define MSK_CFG3_FILTER GENMASK(3, 2) +#define MSK_CFG3_PWM_INPUT_HYSTERESIS GENMASK(1, 0) +#define MSK_CFG4_PWM_TO_I_TH GENMASK(7, 4) + +#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_CFG6_BST_FREQ GENMASK(7, 6) +#define MSK_CFG6_VBST GENMASK(5, 0) + +#define BIT_CFG7_EN_DRV3 BIT(5) +#define BIT_CFG7_EN_DRV2 BIT(4) +#define MSK_CFG7_IBST_LIM GENMASK(1, 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) + +#define BIT_CFGA_SSCLK_EN BIT(7) +#define BIT_CFGA_ADAPTIVE BIT(3) +#define MSK_CFGA_DRIVER_HEADROOM GENMASK(2, 0) +#define MSK_CFGE_STEP_UP GENMASK(7, 6) +#define MSK_CFGE_STEP_DN GENMASK(5, 4) +#define MSK_CFGE_LED_FAULT_TH GENMASK(3, 2) +#define MSK_CFGE_LED_COMP_HYST 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 = { + .reg_bits = 8, + .val_bits = 8, + .max_register = REG_MAX, +}; + +static int sy7758_backlight_update_status(struct backlight_device *backlight_dev) +{ + struct sy7758 *sydev = bl_get_data(backlight_dev); + unsigned int brightness = backlight_get_brightness(backlight_dev); + int ret; + + ret = regmap_write(sydev->regmap, REG_BRT_12BIT_L, + FIELD_PREP(MSK_BRT_12BIT_L, + brightness & 0xff)); + if (ret) + return ret; + + ret = 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 = { + .options = BL_CORE_SUSPENDRESUME, + .update_status = sy7758_backlight_update_status, +}; + +static int sy7758_init(struct sy7758 *sydev) +{ + int ret = 0; + + ret = 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 = regmap_write(sydev->regmap, REG_BRT_12BIT_L, + FIELD_PREP(MSK_BRT_12BIT_L, + DEFAULT_BRIGHTNESS & 0xff)); + if (ret) + return ret; + + ret = regmap_write(sydev->regmap, REG_BRT_12BIT_H, + FIELD_PREP(MSK_BRT_12BIT_H, + (DEFAULT_BRIGHTNESS >> 8))); + if (ret) + return ret; + + ret = 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 = regmap_write(sydev->regmap, REG_OTP_CFG0, + FIELD_PREP(MSK_CFG0_CURRENT_LOW, 85)); + if (ret) + return ret; + + ret = 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 = regmap_write(sydev->regmap, REG_OTP_CFG9, + FIELD_PREP(MSK_CFG9_VBST_MAX, 4)); + if (ret) + return ret; + + ret = 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 = { }; + struct device *dev = &client->dev; + struct sy7758 *sydev; + unsigned int dev_id; + int ret; + + sydev = devm_kzalloc(dev, sizeof(*sydev), GFP_KERNEL); + if (!sydev) + return -ENOMEM; + + i2c_set_clientdata(client, sydev); + + /* Initialize regmap */ + sydev->client = client; + sydev->regmap = 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 = devm_regulator_get_enable(dev, "vddio"); + if (ret) + return dev_err_probe(dev, ret, "failed to get regulator\n"); + + usleep_range(100, 200); + + /* Get enable GPIO and set to high */ + sydev->gpio = 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 */ + usleep_range(10000, 11000); + + /* try read and check device id */ + ret = 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 != 0x63) { + dev_err(dev, "unexpected device id: 0x%02x\n", dev_id); + return -ENODEV; + } + + /* Initialize and set default brightness */ + ret = sy7758_init(sydev); + if (ret) + return ret; + + props.type = BACKLIGHT_RAW; + props.max_brightness = MAX_BRIGHTNESS; + props.brightness = DEFAULT_BRIGHTNESS; + props.scale = BACKLIGHT_SCALE_LINEAR; + + sydev->bl = 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 = i2c_get_clientdata(client); + + backlight_disable(sydev->bl); +} + +static const struct i2c_device_id sy7758_ids[] = { + { "sy7758" }, + { } +}; +MODULE_DEVICE_TABLE(i2c, sy7758_ids); + +static const struct of_device_id sy7758_match_table[] = { + { .compatible = "silergy,sy7758", }, + { }, +}; +MODULE_DEVICE_TABLE(of, sy7758_match_table); + +static struct i2c_driver sy7758_driver = { + .driver = { + .name = "sy7758", + .of_match_table = sy7758_match_table, + }, + .probe = sy7758_probe, + .remove = sy7758_remove, + .id_table = sy7758_ids, +}; + +module_i2c_driver(sy7758_driver); + +MODULE_DESCRIPTION("Silergy SY7758 Backlight Driver"); +MODULE_AUTHOR("Kancy Joe "); +MODULE_LICENSE("GPL"); -- 2.34.1