[{"id":3676225,"web_url":"http://patchwork.ozlabs.org/comment/3676225/","msgid":"<5d1dd70e-0300-4ca0-adb9-73f03cf4bf4d@oss.qualcomm.com>","list_archive_url":null,"date":"2026-04-12T01:06:51","subject":"Re: [PATCH v2 21/21] gpio: add GPIO controller found on Waveshare DSI\n TOUCH panels","submitter":{"id":90146,"url":"http://patchwork.ozlabs.org/api/people/90146/","name":"Jie Gan","email":"jie.gan@oss.qualcomm.com"},"content":"On 4/11/2026 8:10 PM, Dmitry Baryshkov wrote:\n> The Waveshare DSI TOUCH family of panels has separate on-board GPIO\n> controller, which controls power supplies to the panel and the touch\n> screen and provides reset pins for both the panel and the touchscreen.\n> Also it provides a simple PWM controller for panel backlight. Add\n> support for this GPIO controller.\n> \n> Tested-by: Riccardo Mereu \n> Signed-off-by: Dmitry Baryshkov \n> ---\n> drivers/gpio/Kconfig | 10 ++\n> drivers/gpio/Makefile | 1 +\n> drivers/gpio/gpio-waveshare-dsi.c | 208 ++++++++++++++++++++++++++++++++++++++\n> 3 files changed, 219 insertions(+)\n> \n> diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig\n> index dbe7c6e63eab..1b210c451151 100644\n> --- a/drivers/gpio/Kconfig\n> +++ b/drivers/gpio/Kconfig\n> @@ -805,6 +805,16 @@ config GPIO_VISCONTI\n> \thelp\n> \t Say yes here to support GPIO on Tohisba Visconti.\n> \n> +config GPIO_WAVESHARE_DSI_TOUCH\n> +\ttristate \"Waveshare GPIO controller for DSI panels\"\n> +\tdepends on BACKLIGHT_CLASS_DEVICE\n> +\tdepends on I2C\n> +\tselect REGMAP_I2C\n> +\thelp\n> +\t Enable support for the GPIO and PWM controller found on Waveshare DSI\n> +\t TOUCH panel kits. It provides GPIOs (used for regulator control and\n> + resets) and backlight support.\n> +\n> config GPIO_WCD934X\n> \ttristate \"Qualcomm Technologies Inc WCD9340/WCD9341 GPIO controller driver\"\n> \tdepends on MFD_WCD934X\n> diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile\n> index 20d4a57afdaa..75ce89fc3b93 100644\n> --- a/drivers/gpio/Makefile\n> +++ b/drivers/gpio/Makefile\n> @@ -207,6 +207,7 @@ obj-$(CONFIG_GPIO_VIRTUSER)\t\t+= gpio-virtuser.o\n> obj-$(CONFIG_GPIO_VIRTIO)\t\t+= gpio-virtio.o\n> obj-$(CONFIG_GPIO_VISCONTI)\t\t+= gpio-visconti.o\n> obj-$(CONFIG_GPIO_VX855)\t\t+= gpio-vx855.o\n> +obj-$(CONFIG_GPIO_WAVESHARE_DSI_TOUCH)\t+= gpio-waveshare-dsi.o\n> obj-$(CONFIG_GPIO_WCD934X)\t\t+= gpio-wcd934x.o\n> obj-$(CONFIG_GPIO_WHISKEY_COVE)\t\t+= gpio-wcove.o\n> obj-$(CONFIG_GPIO_WINBOND)\t\t+= gpio-winbond.o\n> diff --git a/drivers/gpio/gpio-waveshare-dsi.c b/drivers/gpio/gpio-waveshare-dsi.c\n> new file mode 100644\n> index 000000000000..f4a1d4d3b872\n> --- /dev/null\n> +++ b/drivers/gpio/gpio-waveshare-dsi.c\n> @@ -0,0 +1,208 @@\n> +// SPDX-License-Identifier: GPL-2.0\n> +/*\n> + * Copyright (C) 2024 Waveshare International Limited\n> + * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.\n> + */\n> +\n> +#include \n> +#include \n> +#include \n> +#include \n> +#include \n> +#include \n> +#include \n> +\n> +/* I2C registers of the microcontroller. */\n> +#define REG_TP\t\t0x94\n> +#define REG_LCD\t\t0x95\n> +#define REG_PWM\t\t0x96\n> +#define REG_SIZE\t0x97\n> +#define REG_ID\t\t0x98\n> +#define REG_VERSION\t0x99\n> +\n> +enum {\n> +\tGPIO_AVDD = 0,\n> +\tGPIO_PANEL_RESET = 1,\n> +\tGPIO_BL_ENABLE = 2,\n> +\tGPIO_IOVCC = 4,\n> +\tGPIO_VCC = 8,\n> +\tGPIO_TS_RESET = 9,\n> +};\n> +\n> +#define NUM_GPIO 16\n> +\n> +struct waveshare_gpio {\n> +\tstruct mutex dir_lock;\n> +\tstruct mutex pwr_lock;\n> +\tstruct regmap *regmap;\n> +\tu16 poweron_state;\n> +\n> +\tstruct gpio_chip gc;\n> +};\n> +\n> +static const struct regmap_config waveshare_gpio_regmap_config = {\n> +\t.reg_bits = 8,\n> +\t.val_bits = 8,\n> +\t.max_register = REG_PWM,\n\n.max_register = REG_VERSION,\n\ncheck comments in probe\n\n> +};\n> +\n> +static int waveshare_gpio_get(struct waveshare_gpio *state, unsigned int offset)\n> +{\n> +\tu16 pwr_state;\n> +\n> +\tguard(mutex)(&state->pwr_lock);\n> +\tpwr_state = state->poweron_state & BIT(offset);\n> +\n> +\treturn !!pwr_state;\n> +}\n> +\n> +static int waveshare_gpio_set(struct waveshare_gpio *state, unsigned int offset, int value)\n> +{\n> +\tu16 last_val;\n> +\tint err;\n> +\n> +\tguard(mutex)(&state->pwr_lock);\n> +\n> +\tlast_val = state->poweron_state;\n> +\tif (value)\n> +\t\tlast_val |= BIT(offset);\n> +\telse\n> +\t\tlast_val &= ~BIT(offset);\n> +\n> +\tstate->poweron_state = last_val;\n> +\n> +\terr = regmap_write(state->regmap, REG_TP, last_val >> 8);\n> +\tif (!err)\n> +\t\terr = regmap_write(state->regmap, REG_LCD, last_val & 0xff);\n> +\n> +\treturn err;\n> +}\n> +\n> +static int waveshare_gpio_gpio_get_direction(struct gpio_chip *gc, unsigned int offset)\n> +{\n> +\treturn GPIO_LINE_DIRECTION_OUT;\n> +}\n> +\n> +static int waveshare_gpio_gpio_get(struct gpio_chip *gc, unsigned int offset)\n> +{\n> +\tstruct waveshare_gpio *state = gpiochip_get_data(gc);\n> +\n> +\treturn waveshare_gpio_get(state, offset);\n> +}\n> +\n> +static int waveshare_gpio_gpio_set(struct gpio_chip *gc, unsigned int offset, int value)\n> +{\n> +\tstruct waveshare_gpio *state = gpiochip_get_data(gc);\n> +\n> +\treturn waveshare_gpio_set(state, offset, value);\n> +}\n> +\n> +static int waveshare_gpio_update_status(struct backlight_device *bl)\n> +{\n> +\tstruct waveshare_gpio *state = bl_get_data(bl);\n> +\tint brightness = backlight_get_brightness(bl);\n> +\n> +\twaveshare_gpio_set(state, GPIO_BL_ENABLE, brightness);\n> +\n> +\treturn regmap_write(state->regmap, REG_PWM, brightness);\n> +}\n> +\n> +static const struct backlight_ops waveshare_gpio_bl = {\n> +\t.update_status = waveshare_gpio_update_status,\n> +};\n> +\n> +static int waveshare_gpio_probe(struct i2c_client *i2c)\n> +{\n> +\tstruct backlight_properties props = {};\n> +\tstruct waveshare_gpio *state;\n> +\tstruct device *dev = &i2c->dev;\n> +\tstruct backlight_device *bl;\n> +\tstruct regmap *regmap;\n> +\tunsigned int data;\n> +\tint ret;\n> +\n> +\tstate = devm_kzalloc(dev, sizeof(*state), GFP_KERNEL);\n> +\tif (!state)\n> +\t\treturn -ENOMEM;\n> +\n> +\tret = devm_mutex_init(dev, &state->dir_lock);\n> +\tif (ret)\n> +\t\treturn ret;\n> +\n> +\tret = devm_mutex_init(dev, &state->pwr_lock);\n> +\tif (ret)\n> +\t\treturn ret;\n> +\n> +\tregmap = devm_regmap_init_i2c(i2c, &waveshare_gpio_regmap_config);\n\nfor waveshare_gpio_regmap_config: .max_register = REG_PWM,\n\n> +\tif (IS_ERR(regmap))\n> +\t\treturn dev_err_probe(dev, PTR_ERR(regmap), \"Failed to allocate register map\\n\");\n> +\n> +\tstate->regmap = regmap;\n> +\ti2c_set_clientdata(i2c, state);\n> +\n> +\tret = regmap_read(regmap, REG_ID, &data);\n\nREG_ID here is 0x98,\n\nin _regmap_read -> regmap_readable will check the max_register, then \nreturn -EIO.\n\n> +\tif (ret < 0)\n> +\t\treturn dev_err_probe(dev, ret, \"Failed to read register\\n\");\n> +\n> +\tdev_dbg(dev, \"waveshare panel hw id = 0x%x\\n\", data);\n> +\n> +\tret = regmap_read(regmap, REG_SIZE, &data);\n\nditto.\n\nThanks,\nJie\n\n> +\tif (ret < 0)\n> +\t\treturn dev_err_probe(dev, ret, \"Failed to read register\\n\");\n> +\n> +\tdev_dbg(dev, \"waveshare panel size = %d\\n\", data);\n> +\n> +\tret = regmap_read(regmap, REG_VERSION, &data);\n> +\tif (ret < 0)\n> +\t\treturn dev_err_probe(dev, ret, \"Failed to read register\\n\");\n> +\n> +\tdev_dbg(dev, \"waveshare panel mcu version = 0x%x\\n\", data);\n> +\n> +\tret = waveshare_gpio_set(state, GPIO_TS_RESET, 1);\n> +\tif (ret)\n> +\t\treturn dev_err_probe(dev, ret, \"Failed to program GPIOs\\n\");\n> +\n> +\tmsleep(20);\n> +\n> +\tstate->gc.parent = dev;\n> +\tstate->gc.label = i2c->name;\n> +\tstate->gc.owner = THIS_MODULE;\n> +\tstate->gc.base = -1;\n> +\tstate->gc.ngpio = NUM_GPIO;\n> +\n> +\t/* it is output only */\n> +\tstate->gc.get = waveshare_gpio_gpio_get;\n> +\tstate->gc.set = waveshare_gpio_gpio_set;\n> +\tstate->gc.get_direction = waveshare_gpio_gpio_get_direction;\n> +\tstate->gc.can_sleep = true;\n> +\n> +\tret = devm_gpiochip_add_data(dev, &state->gc, state);\n> +\tif (ret)\n> +\t\treturn dev_err_probe(dev, ret, \"Failed to create gpiochip\\n\");\n> +\n> +\tprops.type = BACKLIGHT_RAW;\n> +\tprops.max_brightness = 255;\n> +\tprops.brightness = 255;\n> +\tbl = devm_backlight_device_register(dev, dev_name(dev), dev, state,\n> +\t\t\t\t\t &waveshare_gpio_bl, &props);\n> +\treturn PTR_ERR_OR_ZERO(bl);\n> +}\n> +\n> +static const struct of_device_id waveshare_gpio_dt_ids[] = {\n> +\t{ .compatible = \"waveshare,dsi-touch-gpio\" },\n> +\t{},\n> +};\n> +MODULE_DEVICE_TABLE(of, waveshare_gpio_dt_ids);\n> +\n> +static struct i2c_driver waveshare_gpio_regulator_driver = {\n> +\t.driver = {\n> +\t\t.name = \"waveshare-regulator\",\n> +\t\t.of_match_table = of_match_ptr(waveshare_gpio_dt_ids),\n> +\t},\n> +\t.probe = waveshare_gpio_probe,\n> +};\n> +\n> +module_i2c_driver(waveshare_gpio_regulator_driver);\n> +\n> +MODULE_DESCRIPTION(\"GPIO controller driver for Waveshare DSI touch panels\");\n> +MODULE_LICENSE(\"GPL\");\n>","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-gpio@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=qualcomm.com header.i=@qualcomm.com header.a=rsa-sha256\n header.s=qcppdkim1 header.b=bDK5SyAt;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=oss.qualcomm.com header.i=@oss.qualcomm.com\n header.a=rsa-sha256 header.s=google header.b=eAAjnHbK;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n 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linux-gpio@vger.kernel.org,\n Riccardo Mereu ","References":"<20260411-waveshare-dsi-touch-v2-0-75cdbeac5156@oss.qualcomm.com>\n <20260411-waveshare-dsi-touch-v2-21-75cdbeac5156@oss.qualcomm.com>","Content-Language":"en-US","From":"Jie Gan ","In-Reply-To":"\n <20260411-waveshare-dsi-touch-v2-21-75cdbeac5156@oss.qualcomm.com>","Content-Type":"text/plain; charset=UTF-8; format=flowed","Content-Transfer-Encoding":"7bit","X-Proofpoint-GUID":"j3FcY8TlpOm_61YupUNfMUJJoElSxl-9","X-Proofpoint-Spam-Details-Enc":"AW1haW4tMjYwNDEyMDAwOCBTYWx0ZWRfXwy3ernMJYgR/\n kA9qn8CmX1ySzn89r4wpNBEq/NcP/SjEEN12GSyBE2FmFrCDj4OncRyzoevD3kgqF2Rh6+SkIOU\n f8/by8R3M8av3kLf0XGHp150f5SRrSu3o95Dhu3g+lUFtIeuU/g8ATiATrG/BPsmIZZx+69Co76\n FRRuYgl9P3tU6xFqMWgvS3Z8M/i+8bBvEx1jEGSZKBjN+t2hId5A2HlnR8Ut1vRdUHcyCsjXZvf\n BlAIaTGFOY5Z0kPk7aGXs72thINiPdF9JNQ5NyGdZGHJdXDFu7Wa5OTHlOzackptu457CNpXOI8\n wKj+shKYuUhnF1Y4SYMbwis8t1vo9+zYo18zJUneX3KP2byIVVcj1xQwmQRzKkqQ8TFbf19Jxhp\n 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adjust=0\n reason=mlx scancount=1 engine=8.22.0-2604010000 definitions=main-2604120008"}},{"id":3676328,"web_url":"http://patchwork.ozlabs.org/comment/3676328/","msgid":"","list_archive_url":null,"date":"2026-04-12T17:17:57","subject":"Re: [PATCH v2 21/21] gpio: add GPIO controller found on Waveshare\n DSI TOUCH panels","submitter":{"id":90483,"url":"http://patchwork.ozlabs.org/api/people/90483/","name":"Dmitry Baryshkov","email":"dmitry.baryshkov@oss.qualcomm.com"},"content":"On Sun, Apr 12, 2026 at 09:06:51AM +0800, Jie Gan wrote:\n> \n> \n> On 4/11/2026 8:10 PM, Dmitry Baryshkov wrote:\n> > The Waveshare DSI TOUCH family of panels has separate on-board GPIO\n> > controller, which controls power supplies to the panel and the touch\n> > screen and provides reset pins for both the panel and the touchscreen.\n> > Also it provides a simple PWM controller for panel backlight. Add\n> > support for this GPIO controller.\n> > \n> > Tested-by: Riccardo Mereu \n> > Signed-off-by: Dmitry Baryshkov \n> > ---\n> > drivers/gpio/Kconfig | 10 ++\n> > drivers/gpio/Makefile | 1 +\n> > drivers/gpio/gpio-waveshare-dsi.c | 208 ++++++++++++++++++++++++++++++++++++++\n> > 3 files changed, 219 insertions(+)\n> > \n> > diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig\n> > index dbe7c6e63eab..1b210c451151 100644\n> > --- a/drivers/gpio/Kconfig\n> > +++ b/drivers/gpio/Kconfig\n> > @@ -805,6 +805,16 @@ config GPIO_VISCONTI\n> > \thelp\n> > \t Say yes here to support GPIO on Tohisba Visconti.\n> > +config GPIO_WAVESHARE_DSI_TOUCH\n> > +\ttristate \"Waveshare GPIO controller for DSI panels\"\n> > +\tdepends on BACKLIGHT_CLASS_DEVICE\n> > +\tdepends on I2C\n> > +\tselect REGMAP_I2C\n> > +\thelp\n> > +\t Enable support for the GPIO and PWM controller found on Waveshare DSI\n> > +\t TOUCH panel kits. It provides GPIOs (used for regulator control and\n> > + resets) and backlight support.\n> > +\n> > config GPIO_WCD934X\n> > \ttristate \"Qualcomm Technologies Inc WCD9340/WCD9341 GPIO controller driver\"\n> > \tdepends on MFD_WCD934X\n> > diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile\n> > index 20d4a57afdaa..75ce89fc3b93 100644\n> > --- a/drivers/gpio/Makefile\n> > +++ b/drivers/gpio/Makefile\n> > @@ -207,6 +207,7 @@ obj-$(CONFIG_GPIO_VIRTUSER)\t\t+= gpio-virtuser.o\n> > obj-$(CONFIG_GPIO_VIRTIO)\t\t+= gpio-virtio.o\n> > obj-$(CONFIG_GPIO_VISCONTI)\t\t+= gpio-visconti.o\n> > obj-$(CONFIG_GPIO_VX855)\t\t+= gpio-vx855.o\n> > +obj-$(CONFIG_GPIO_WAVESHARE_DSI_TOUCH)\t+= gpio-waveshare-dsi.o\n> > obj-$(CONFIG_GPIO_WCD934X)\t\t+= gpio-wcd934x.o\n> > obj-$(CONFIG_GPIO_WHISKEY_COVE)\t\t+= gpio-wcove.o\n> > obj-$(CONFIG_GPIO_WINBOND)\t\t+= gpio-winbond.o\n> > diff --git a/drivers/gpio/gpio-waveshare-dsi.c b/drivers/gpio/gpio-waveshare-dsi.c\n> > new file mode 100644\n> > index 000000000000..f4a1d4d3b872\n> > --- /dev/null\n> > +++ b/drivers/gpio/gpio-waveshare-dsi.c\n> > @@ -0,0 +1,208 @@\n> > +// SPDX-License-Identifier: GPL-2.0\n> > +/*\n> > + * Copyright (C) 2024 Waveshare International Limited\n> > + * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.\n> > + */\n> > +\n> > +#include \n> > +#include \n> > +#include \n> > +#include \n> > +#include \n> > +#include \n> > +#include \n> > +\n> > +/* I2C registers of the microcontroller. */\n> > +#define REG_TP\t\t0x94\n> > +#define REG_LCD\t\t0x95\n> > +#define REG_PWM\t\t0x96\n> > +#define REG_SIZE\t0x97\n> > +#define REG_ID\t\t0x98\n> > +#define REG_VERSION\t0x99\n> > +\n> > +enum {\n> > +\tGPIO_AVDD = 0,\n> > +\tGPIO_PANEL_RESET = 1,\n> > +\tGPIO_BL_ENABLE = 2,\n> > +\tGPIO_IOVCC = 4,\n> > +\tGPIO_VCC = 8,\n> > +\tGPIO_TS_RESET = 9,\n> > +};\n> > +\n> > +#define NUM_GPIO 16\n> > +\n> > +struct waveshare_gpio {\n> > +\tstruct mutex dir_lock;\n> > +\tstruct mutex pwr_lock;\n> > +\tstruct regmap *regmap;\n> > +\tu16 poweron_state;\n> > +\n> > +\tstruct gpio_chip gc;\n> > +};\n> > +\n> > +static const struct regmap_config waveshare_gpio_regmap_config = {\n> > +\t.reg_bits = 8,\n> > +\t.val_bits = 8,\n> > +\t.max_register = REG_PWM,\n> \n> .max_register = REG_VERSION,\n> \n> check comments in probe\n\nYep, thanks (and for other comments too)!","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-gpio@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=qualcomm.com header.i=@qualcomm.com header.a=rsa-sha256\n header.s=qcppdkim1 header.b=TXhNqKJu;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=oss.qualcomm.com header.i=@oss.qualcomm.com\n header.a=rsa-sha256 header.s=google header.b=fb7F1rTZ;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c0a:e001:db::12fc:5321; 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