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GET /api/patches/2218415/?format=api
{ "id": 2218415, "url": "http://patchwork.ozlabs.org/api/patches/2218415/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-gpio/patch/20260401-waveshare-dsi-touch-v1-19-5e9119b5a014@oss.qualcomm.com/", "project": { "id": 42, "url": "http://patchwork.ozlabs.org/api/projects/42/?format=api", "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": "", "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260401-waveshare-dsi-touch-v1-19-5e9119b5a014@oss.qualcomm.com>", "list_archive_url": null, "date": "2026-04-01T07:26:38", "name": "[19/19] gpio: add GPIO controller found on Waveshare DSI TOUCH panels", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "f1011669884347d07f0dad05c52951cf10e52a3a", "submitter": { "id": 90483, "url": "http://patchwork.ozlabs.org/api/people/90483/?format=api", "name": "Dmitry Baryshkov", "email": "dmitry.baryshkov@oss.qualcomm.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linux-gpio/patch/20260401-waveshare-dsi-touch-v1-19-5e9119b5a014@oss.qualcomm.com/mbox/", "series": [ { "id": 498284, "url": "http://patchwork.ozlabs.org/api/series/498284/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-gpio/list/?series=498284", "date": "2026-04-01T07:26:23", "name": "drm/panel: support Waveshare DSI TOUCH kits", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/498284/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2218415/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2218415/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linux-gpio+bounces-34548-incoming=patchwork.ozlabs.org@vger.kernel.org>", "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=KvCrlkrc;\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=ehf5B0jN;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c15:e001:75::12fc:5321; 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charset=\"utf-8\"", "Content-Transfer-Encoding": "7bit", "Message-Id": "<20260401-waveshare-dsi-touch-v1-19-5e9119b5a014@oss.qualcomm.com>", "References": "<20260401-waveshare-dsi-touch-v1-0-5e9119b5a014@oss.qualcomm.com>", "In-Reply-To": "<20260401-waveshare-dsi-touch-v1-0-5e9119b5a014@oss.qualcomm.com>", "To": "Neil Armstrong <neil.armstrong@linaro.org>,\n Jessica Zhang <jesszhan0024@gmail.com>,\n David Airlie <airlied@gmail.com>, Simona Vetter <simona@ffwll.ch>,\n Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,\n Maxime Ripard <mripard@kernel.org>,\n Thomas Zimmermann <tzimmermann@suse.de>,\n Rob Herring <robh@kernel.org>,\n Krzysztof Kozlowski <krzk+dt@kernel.org>,\n Conor Dooley <conor+dt@kernel.org>,\n Cong Yang <yangcong5@huaqin.corp-partner.google.com>,\n Ondrej Jirman <megi@xff.cz>,\n Javier Martinez Canillas <javierm@redhat.com>,\n Jagan Teki <jagan@edgeble.ai>, Liam Girdwood <lgirdwood@gmail.com>,\n Mark Brown <broonie@kernel.org>, Linus Walleij <linusw@kernel.org>,\n Bartosz Golaszewski <brgl@kernel.org>", "Cc": "dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org,\n linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org", "X-Mailer": "b4 0.15.1", "X-Developer-Signature": "v=1; a=openpgp-sha256; l=8004;\n i=dmitry.baryshkov@oss.qualcomm.com; h=from:subject:message-id;\n bh=6Pv5TDECwfzFeKPInl1W6rcgS2uPfThpvtka1MoOwas=;\n b=owEBbQGS/pANAwAKAYs8ij4CKSjVAcsmYgBpzMiuUWpWPOeZGuuLLQ40KhL8JtSf4hH3mDIgE\n y/HN7rptMSJATMEAAEKAB0WIQRMcISVXLJjVvC4lX+LPIo+Aiko1QUCaczIrgAKCRCLPIo+Aiko\n 1cKpCACvZf2ujh7YMIYrGs/cEO+QwEsJheddWO6TLJ3bW42C8nSqwHx7I4QyizX8OzMR4rBnZ91\n /3+OT/K96HNADPq8UfYTJCBB0h0a4E2jzlIejdr5Rck+6CJL+YyvRWAlN7w3ey9g0D0ZM9qUo3N\n wYRlf1zJ96xd528nKbOVKqkPx6h39iyHLHaEGtc9LWUYSHQLnZLAxmgpEzouFhh5XCRiLCA34Q7\n yGtp20m3pWr7dG85li6LLz9HqRFDAqkGLxOM7YJ2aQVL7E/kGHTRsqBRPhIzg/TIDPn2lQTm/La\n sedQQFhHqenjviF59OiDVv5zRU+oTyCVG+0Hh7FGHQfe2Mb3", "X-Developer-Key": "i=dmitry.baryshkov@oss.qualcomm.com; a=openpgp;\n fpr=8F88381DD5C873E4AE487DA5199BF1243632046A", "X-Proofpoint-Spam-Details-Enc": "AW1haW4tMjYwNDAxMDA2NCBTYWx0ZWRfX1IzaixpJKGVu\n hcBhvO5LQl1qbZ+DTdoZDXg88DmR1mopVlTzrL3uU7dB50sq4CVdZSd5lNQnhhCuA+dXoDcVtb5\n A18Dl1csyBbFBQTMdGQH3RHdiULgY0oDty0pffuzhH6npkQbzTCNsavi25JJ+EIZauW0z5eCc92\n GzCyK1nDVKRu8I6qwHEeEuFtqyDMEC4jy4INamnkrX9kdjmHGHdl6Ecv2nqdnySz5iwHdBY8uOU\n v+cQPPBzwejYdZoPqK4cwq7b7qZa4uFrg/pGVa800dVIk7COgwPSYh5iNjobbJG842e//4KgeQp\n WYQCIsuc+MArHsQqkcXBDanKLB4oDiQZc0t42NTo432tSzi2U9vxDb8VqefG6hftsPSnhhdkYrf\n cIZWZgtepdLE3txbmrbpMcfnXm3r6kWA3hIudl7CuTzlyACQxUG4e8UH9R8Ob4n/f+oBgE6Qtpo\n DTjBoL36vEF1JEhDzBQ==", "X-Authority-Analysis": "v=2.4 cv=YcawJgRf c=1 sm=1 tr=0 ts=69ccc8e1 cx=c_pps\n a=mPf7EqFMSY9/WdsSgAYMbA==:117 a=xqWC_Br6kY4A:10 a=IkcTkHD0fZMA:10\n a=A5OVakUREuEA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22\n a=u7WPNUs3qKkmUXheDGA7:22 a=DJpcGTmdVt4CTyJn9g5Z:22 a=EUspDBNiAAAA:8\n a=BBJQNc9AFPM2Ar9AcygA:9 a=QEXdDO2ut3YA:10 a=dawVfQjAaf238kedN5IG:22", "X-Proofpoint-GUID": "sE9G4x3RrGLb6R6MwWB48qz11EvysPLj", "X-Proofpoint-ORIG-GUID": "sE9G4x3RrGLb6R6MwWB48qz11EvysPLj", "X-Proofpoint-Virus-Version": "vendor=baseguard\n engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49\n definitions=2026-04-01_02,2026-04-01_01,2025-10-01_01", "X-Proofpoint-Spam-Details": "rule=outbound_notspam policy=outbound score=0\n phishscore=0 priorityscore=1501 adultscore=0 clxscore=1015 suspectscore=0\n malwarescore=0 impostorscore=0 spamscore=0 lowpriorityscore=0 bulkscore=0\n classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0\n reason=mlx scancount=1 engine=8.22.0-2603050001 definitions=main-2604010064" }, "content": "The Waveshare DSI TOUCH family of panels has separate on-board GPIO\ncontroller, which controls power supplies to the panel and the touch\nscreen and provides reset pins for both the panel and the touchscreen.\nAlso it provides a simple PWM controller for panel backlight. Add\nsupport for this GPIO controller.\n\nSigned-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>\n---\n drivers/gpio/Kconfig | 10 ++\n drivers/gpio/Makefile | 1 +\n drivers/gpio/gpio-waveshare-dsi.c | 220 ++++++++++++++++++++++++++++++++++++++\n 3 files changed, 231 insertions(+)", "diff": "diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig\nindex 4c3f6ec336c1..f0bb5cdebf9b 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\ndiff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile\nindex 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\ndiff --git a/drivers/gpio/gpio-waveshare-dsi.c b/drivers/gpio/gpio-waveshare-dsi.c\nnew file mode 100644\nindex 000000000000..30fe7569c150\n--- /dev/null\n+++ b/drivers/gpio/gpio-waveshare-dsi.c\n@@ -0,0 +1,220 @@\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 <linux/backlight.h>\n+#include <linux/err.h>\n+#include <linux/fb.h>\n+#include <linux/gpio/driver.h>\n+#include <linux/module.h>\n+#include <linux/of.h>\n+#include <linux/regmap.h>\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+\tNUM_GPIO = 16,\n+};\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+\n+static int waveshare_gpio_get(struct waveshare_gpio *state, unsigned int offset)\n+{\n+\tu16 pwr_state;\n+\n+\tmutex_lock(&state->pwr_lock);\n+\tpwr_state = state->poweron_state & BIT(offset);\n+\tmutex_unlock(&state->pwr_lock);\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+\n+\tmutex_lock(&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+\tregmap_write(state->regmap, REG_TP, last_val >> 8);\n+\tregmap_write(state->regmap, REG_LCD, last_val & 0xff);\n+\n+\tmutex_unlock(&state->pwr_lock);\n+\n+\treturn 0;\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_i2c_read(struct i2c_client *client, u8 reg, unsigned int *buf)\n+{\n+\tint val;\n+\n+\tval = i2c_smbus_read_byte_data(client, reg);\n+\tif (val < 0)\n+\t\treturn val;\n+\n+\t*buf = val;\n+\n+\treturn 0;\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+\ti2c_set_clientdata(i2c, state);\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+\tret = waveshare_gpio_i2c_read(i2c, 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 = waveshare_gpio_i2c_read(i2c, 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 = waveshare_gpio_i2c_read(i2c, 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+\tstate->poweron_state = BIT(GPIO_TS_RESET);\n+\tregmap_write(regmap, REG_TP, state->poweron_state >> 8);\n+\tregmap_write(regmap, REG_LCD, state->poweron_state & 0xff);\n+\tmsleep(20);\n+\n+\tstate->regmap = regmap;\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": [ "19/19" ] }