{"id":2222734,"url":"http://patchwork.ozlabs.org/api/1.1/patches/2222734/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-gpio/patch/20260413-waveshare-dsi-touch-v3-21-3aeb53022c32@oss.qualcomm.com/","project":{"id":42,"url":"http://patchwork.ozlabs.org/api/1.1/projects/42/?format=json","name":"Linux GPIO development","link_name":"linux-gpio","list_id":"linux-gpio.vger.kernel.org","list_email":"linux-gpio@vger.kernel.org","web_url":"","scm_url":"","webscm_url":""},"msgid":"<20260413-waveshare-dsi-touch-v3-21-3aeb53022c32@oss.qualcomm.com>","date":"2026-04-13T14:05:44","name":"[v3,21/21] gpio: add GPIO controller found on Waveshare DSI TOUCH panels","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"260fc97edcb1fa8c4e087a7c2e234428278a6610","submitter":{"id":90483,"url":"http://patchwork.ozlabs.org/api/1.1/people/90483/?format=json","name":"Dmitry Baryshkov","email":"dmitry.baryshkov@oss.qualcomm.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/linux-gpio/patch/20260413-waveshare-dsi-touch-v3-21-3aeb53022c32@oss.qualcomm.com/mbox/","series":[{"id":499710,"url":"http://patchwork.ozlabs.org/api/1.1/series/499710/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-gpio/list/?series=499710","date":"2026-04-13T14:05:24","name":"drm/panel: support Waveshare DSI TOUCH kits","version":3,"mbox":"http://patchwork.ozlabs.org/series/499710/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2222734/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2222734/checks/","tags":{},"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=S/MVJl5d;\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=XgPvSxY3;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c04:e001:36c::12fc:5321; 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charset=\"utf-8\"","Content-Transfer-Encoding":"7bit","Message-Id":"<20260413-waveshare-dsi-touch-v3-21-3aeb53022c32@oss.qualcomm.com>","References":"<20260413-waveshare-dsi-touch-v3-0-3aeb53022c32@oss.qualcomm.com>","In-Reply-To":"<20260413-waveshare-dsi-touch-v3-0-3aeb53022c32@oss.qualcomm.com>","To":"Neil Armstrong ,\n Jessica Zhang ,\n David Airlie , Simona Vetter ,\n Maarten Lankhorst ,\n Maxime Ripard ,\n Thomas Zimmermann ,\n Rob Herring ,\n Krzysztof Kozlowski ,\n Conor Dooley ,\n Cong Yang ,\n Ondrej Jirman ,\n Javier Martinez Canillas ,\n Jagan Teki , Liam Girdwood ,\n Mark Brown , Linus Walleij ,\n Bartosz Golaszewski ,\n Jie Gan ","Cc":"dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org,\n linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org,\n Riccardo Mereu ","X-Mailer":"b4 0.15.1","X-Developer-Signature":"v=1; a=openpgp-sha256; l=7752;\n i=dmitry.baryshkov@oss.qualcomm.com; h=from:subject:message-id;\n bh=LLB5S+fq0OkGtz5fZjjGOedSRUpC3QiVTV63iuC2ud8=;\n b=owEBbQGS/pANAwAKAYs8ij4CKSjVAcsmYgBp3Pgp0CRuEJwBZE0M+s4m5iHBHk23SvG/pqay2\n 5QqzBFjhz6JATMEAAEKAB0WIQRMcISVXLJjVvC4lX+LPIo+Aiko1QUCadz4KQAKCRCLPIo+Aiko\n 1WLhB/0cpboMrZy9Q/a48/y4YERdx8SOPJoAKVOFjUn0HrVr5HZHrZ8Rrpg0CsYmnGo0jESQzYg\n H2+46/0JcudTvznVDqZ3TStiWBLo8H82ZGCG4qVj+OvVlmS68e/GMWRCf2eU4EdfdnVYrj8+UUP\n jmkLp5Z3l1mc5v/gcNN40tzi/sb4O/fLRxHFXKNmIHBGylaOg1Km4jYMs67D2E610WAHvuhMzGP\n 0GfRy4CXzQ1cecaphhja5AV/hQzAlrstnUzLLgfvmegRby9y0//oJXBcr7IfoyFCpQ2fpaSwja2\n BXBa4dG1a/tM/B6F9nE3RF+t92n5t1JgqpMpvsYDFy9DZKnD","X-Developer-Key":"i=dmitry.baryshkov@oss.qualcomm.com; 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Add\nsupport for this GPIO controller.\n\nTested-by: Riccardo Mereu \nSigned-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(+)","diff":"diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig\nindex b45fb799e36c..e24ad7e32034 100644\n--- a/drivers/gpio/Kconfig\n+++ b/drivers/gpio/Kconfig\n@@ -804,6 +804,16 @@ 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 && OF_GPIO\ndiff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile\nindex c05f7d795c43..94f16f0f28d9 100644\n--- a/drivers/gpio/Makefile\n+++ b/drivers/gpio/Makefile\n@@ -206,6 +206,7 @@ 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\ndiff --git a/drivers/gpio/gpio-waveshare-dsi.c b/drivers/gpio/gpio-waveshare-dsi.c\nnew file mode 100644\nindex 000000000000..38f52351bb58\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_VERSION,\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+\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+\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+\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","prefixes":["v3","21/21"]}