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GET /api/patches/2196993/?format=api
{ "id": 2196993, "url": "http://patchwork.ozlabs.org/api/patches/2196993/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-gpio/patch/20260216211021.3019827-1-james.hilliard1@gmail.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": "<20260216211021.3019827-1-james.hilliard1@gmail.com>", "list_archive_url": null, "date": "2026-02-16T21:10:19", "name": "[v3,1/1] gpiolib: of: add gpio-line node support", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "2725b4e83e902627e14d9a07bfe9c5c098e93a9c", "submitter": { "id": 66301, "url": "http://patchwork.ozlabs.org/api/people/66301/?format=api", "name": "James Hilliard", "email": "james.hilliard1@gmail.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linux-gpio/patch/20260216211021.3019827-1-james.hilliard1@gmail.com/mbox/", "series": [ { "id": 492350, "url": "http://patchwork.ozlabs.org/api/series/492350/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-gpio/list/?series=492350", "date": "2026-02-16T21:10:19", "name": "[v3,1/1] gpiolib: of: add gpio-line node support", "version": 3, "mbox": "http://patchwork.ozlabs.org/series/492350/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2196993/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2196993/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linux-gpio+bounces-31728-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=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20230601 header.b=T+Jdbft/;\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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GPIO\nhogs can initialize lines but reserve them permanently.\n\nAdd gpiod_apply_line_init() as a core helper for one-shot line\ninitialization and use it for gpio-line setup.\n\nBecause gpio-line initialization does not reserve ownership, subsequent\nconsumer requests remain normal requests and may reconfigure or release\nthe line as usual.\n\nSupport \"gpio-line-name\" for setting the visible line name. For\ngpio-hog nodes, keep \"line-name\" semantics as the hog consumer label.\n\nSome boards only need to name a small subset of GPIO lines. Doing this\ngenerally requires defining a full gpio-line-names array with empty\nplaceholders for unrelated lines.\n\nIn overlays, gpio-line-names replacement is all-or-nothing. Names from\nbase DT and multiple overlays for the same gpiochip do not compose,\nbecause each update replaces the full property.\n\nSigned-off-by: James Hilliard <james.hilliard1@gmail.com>\n---\nDepends on:\n - https://github.com/devicetree-org/dt-schema/pull/185\n\nChanges v1 -> v2:\n - drop documentation changes\n - add depends on to changelog\n\nChanges v2 -> v3:\n - add gpiod_apply_line_init() in gpiolib core\n - switch gpio-line setup to use gpiod_apply_line_init()\n---\n drivers/gpio/gpiolib-of.c | 89 ++++++++++++++++++++++++++++-------\n drivers/gpio/gpiolib-shared.c | 7 +--\n drivers/gpio/gpiolib.c | 48 +++++++++++++++++++\n drivers/gpio/gpiolib.h | 3 ++\n drivers/of/property.c | 7 +--\n scripts/dtc/checks.c | 4 +-\n 6 files changed, 133 insertions(+), 25 deletions(-)", "diff": "diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c\nindex ef1ac68b94b7..5f531d5cbc00 100644\n--- a/drivers/gpio/gpiolib-of.c\n+++ b/drivers/gpio/gpiolib-of.c\n@@ -744,6 +744,7 @@ struct gpio_desc *of_find_gpio(struct device_node *np, const char *con_id,\n * @lflags:\tbitmask of gpio_lookup_flags GPIO_* values - returned from\n *\t\tof_find_gpio() or of_parse_own_gpio()\n * @dflags:\tgpiod_flags - optional GPIO initialization flags\n+ * @hog:\tindicates if this is a gpio-hog node\n *\n * Returns:\n * GPIO descriptor to use with Linux GPIO API, or one of the errno\n@@ -753,11 +754,13 @@ static struct gpio_desc *of_parse_own_gpio(struct device_node *np,\n \t\t\t\t\t struct gpio_chip *chip,\n \t\t\t\t\t unsigned int idx, const char **name,\n \t\t\t\t\t unsigned long *lflags,\n-\t\t\t\t\t enum gpiod_flags *dflags)\n+\t\t\t\t\t enum gpiod_flags *dflags,\n+\t\t\t\t\t bool hog)\n {\n \tstruct device_node *chip_np;\n \tenum of_gpio_flags xlate_flags;\n \tstruct of_phandle_args gpiospec;\n+\tconst char *desc_name;\n \tstruct gpio_desc *desc;\n \tunsigned int i;\n \tu32 tmp;\n@@ -797,15 +800,19 @@ static struct gpio_desc *of_parse_own_gpio(struct device_node *np,\n \t\t*dflags |= GPIOD_OUT_LOW;\n \telse if (of_property_read_bool(np, \"output-high\"))\n \t\t*dflags |= GPIOD_OUT_HIGH;\n-\telse {\n+\telse if (hog) {\n \t\tpr_warn(\"GPIO line %d (%pOFn): no hogging state specified, bailing out\\n\",\n \t\t\tdesc_to_gpio(desc), np);\n \t\treturn ERR_PTR(-EINVAL);\n \t}\n \n-\tif (name && of_property_read_string(np, \"line-name\", name))\n+\tif (hog && name && of_property_read_string(np, \"line-name\", name))\n \t\t*name = np->name;\n \n+\tif (!of_property_read_string(np, \"gpio-line-name\", &desc_name) &&\n+\t desc_name[0])\n+\t\tdesc->name = desc_name;\n+\n \treturn desc;\n }\n \n@@ -827,7 +834,8 @@ static int of_gpiochip_add_hog(struct gpio_chip *chip, struct device_node *hog)\n \tint ret;\n \n \tfor (i = 0;; i++) {\n-\t\tdesc = of_parse_own_gpio(hog, chip, i, &name, &lflags, &dflags);\n+\t\tdesc = of_parse_own_gpio(hog, chip, i, &name, &lflags, &dflags,\n+\t\t\t\t\t true);\n \t\tif (IS_ERR(desc))\n \t\t\tbreak;\n \n@@ -843,6 +851,36 @@ static int of_gpiochip_add_hog(struct gpio_chip *chip, struct device_node *hog)\n \treturn 0;\n }\n \n+/**\n+ * of_gpiochip_add_line - Configure all lines in a gpio-line device node\n+ * @chip:\tgpio chip to act on\n+ * @line:\tdevice node describing GPIO lines to configure\n+ *\n+ * Returns:\n+ * 0 on success, or negative errno on failure.\n+ */\n+static int of_gpiochip_add_line(struct gpio_chip *chip, struct device_node *line)\n+{\n+\tenum gpiod_flags dflags;\n+\tstruct gpio_desc *desc;\n+\tunsigned long lflags;\n+\tunsigned int i;\n+\tint ret;\n+\n+\tfor (i = 0;; i++) {\n+\t\tdesc = of_parse_own_gpio(line, chip, i, NULL, &lflags, &dflags,\n+\t\t\t\t\t false);\n+\t\tif (IS_ERR(desc))\n+\t\t\tbreak;\n+\n+\t\tret = gpiod_apply_line_init(desc, NULL, lflags, dflags);\n+\t\tif (ret < 0)\n+\t\t\treturn ret;\n+\t}\n+\n+\treturn 0;\n+}\n+\n /**\n * of_gpiochip_scan_gpios - Scan gpio-controller for gpio definitions\n * @chip:\tgpio chip to act on\n@@ -858,14 +896,22 @@ static int of_gpiochip_scan_gpios(struct gpio_chip *chip)\n \tint ret;\n \n \tfor_each_available_child_of_node_scoped(dev_of_node(&chip->gpiodev->dev), np) {\n-\t\tif (!of_property_read_bool(np, \"gpio-hog\"))\n+\t\tif (of_property_read_bool(np, \"gpio-hog\")) {\n+\t\t\tret = of_gpiochip_add_hog(chip, np);\n+\t\t\tif (ret < 0)\n+\t\t\t\treturn ret;\n+\n+\t\t\tof_node_set_flag(np, OF_POPULATED);\n \t\t\tcontinue;\n+\t\t}\n \n-\t\tret = of_gpiochip_add_hog(chip, np);\n-\t\tif (ret < 0)\n-\t\t\treturn ret;\n+\t\tif (of_property_read_bool(np, \"gpio-line\")) {\n+\t\t\tret = of_gpiochip_add_line(chip, np);\n+\t\t\tif (ret < 0)\n+\t\t\t\treturn ret;\n \n-\t\tof_node_set_flag(np, OF_POPULATED);\n+\t\t\tof_node_set_flag(np, OF_POPULATED);\n+\t\t}\n \t}\n \n \treturn 0;\n@@ -905,14 +951,15 @@ static int of_gpio_notify(struct notifier_block *nb, unsigned long action,\n \tint ret;\n \n \t/*\n-\t * This only supports adding and removing complete gpio-hog nodes.\n-\t * Modifying an existing gpio-hog node is not supported (except for\n-\t * changing its \"status\" property, which is treated the same as\n-\t * addition/removal).\n+\t * This only supports adding and removing complete gpio-hog and\n+\t * gpio-line nodes. Modifying an existing node is not supported\n+\t * (except for changing its \"status\" property, which is treated\n+\t * the same as addition/removal).\n \t */\n \tswitch (of_reconfig_get_state_change(action, arg)) {\n \tcase OF_RECONFIG_CHANGE_ADD:\n-\t\tif (!of_property_read_bool(rd->dn, \"gpio-hog\"))\n+\t\tif (!of_property_read_bool(rd->dn, \"gpio-hog\") &&\n+\t\t !of_property_read_bool(rd->dn, \"gpio-line\"))\n \t\t\treturn NOTIFY_DONE;\t/* not for us */\n \n \t\tif (of_node_test_and_set_flag(rd->dn, OF_POPULATED))\n@@ -922,9 +969,12 @@ static int of_gpio_notify(struct notifier_block *nb, unsigned long action,\n \t\tif (!gdev)\n \t\t\treturn NOTIFY_DONE;\t/* not for us */\n \n-\t\tret = of_gpiochip_add_hog(gpio_device_get_chip(gdev), rd->dn);\n+\t\tif (of_property_read_bool(rd->dn, \"gpio-hog\"))\n+\t\t\tret = of_gpiochip_add_hog(gpio_device_get_chip(gdev), rd->dn);\n+\t\telse\n+\t\t\tret = of_gpiochip_add_line(gpio_device_get_chip(gdev), rd->dn);\n \t\tif (ret < 0) {\n-\t\t\tpr_err(\"%s: failed to add hogs for %pOF\\n\", __func__,\n+\t\t\tpr_err(\"%s: failed to configure lines for %pOF\\n\", __func__,\n \t\t\t rd->dn);\n \t\t\tof_node_clear_flag(rd->dn, OF_POPULATED);\n \t\t\treturn notifier_from_errno(ret);\n@@ -932,6 +982,10 @@ static int of_gpio_notify(struct notifier_block *nb, unsigned long action,\n \t\treturn NOTIFY_OK;\n \n \tcase OF_RECONFIG_CHANGE_REMOVE:\n+\t\tif (!of_property_read_bool(rd->dn, \"gpio-hog\") &&\n+\t\t !of_property_read_bool(rd->dn, \"gpio-line\"))\n+\t\t\treturn NOTIFY_DONE;\t/* not for us */\n+\n \t\tif (!of_node_check_flag(rd->dn, OF_POPULATED))\n \t\t\treturn NOTIFY_DONE;\t/* already depopulated */\n \n@@ -939,7 +993,8 @@ static int of_gpio_notify(struct notifier_block *nb, unsigned long action,\n \t\tif (!gdev)\n \t\t\treturn NOTIFY_DONE;\t/* not for us */\n \n-\t\tof_gpiochip_remove_hog(gpio_device_get_chip(gdev), rd->dn);\n+\t\tif (of_property_read_bool(rd->dn, \"gpio-hog\"))\n+\t\t\tof_gpiochip_remove_hog(gpio_device_get_chip(gdev), rd->dn);\n \t\tof_node_clear_flag(rd->dn, OF_POPULATED);\n \t\treturn NOTIFY_OK;\n \t}\ndiff --git a/drivers/gpio/gpiolib-shared.c b/drivers/gpio/gpiolib-shared.c\nindex b3525d1f06a4..b934e58a07f0 100644\n--- a/drivers/gpio/gpiolib-shared.c\n+++ b/drivers/gpio/gpiolib-shared.c\n@@ -147,10 +147,11 @@ static bool gpio_shared_of_node_ignore(struct device_node *node)\n \t\treturn true;\n \n \t/*\n-\t * GPIO hogs have a \"gpios\" property which is not a phandle and can't\n-\t * possibly refer to a shared GPIO.\n+\t * GPIO hog and gpio-line nodes have a \"gpios\" property which is not a\n+\t * phandle and can't possibly refer to a shared GPIO.\n \t */\n-\tif (of_property_present(node, \"gpio-hog\"))\n+\tif (of_property_present(node, \"gpio-hog\") ||\n+\t of_property_present(node, \"gpio-line\"))\n \t\treturn true;\n \n \treturn false;\ndiff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c\nindex c52200eaaaff..e5ef2c0d8432 100644\n--- a/drivers/gpio/gpiolib.c\n+++ b/drivers/gpio/gpiolib.c\n@@ -5061,6 +5061,54 @@ int gpiod_hog(struct gpio_desc *desc, const char *name,\n \treturn 0;\n }\n \n+/**\n+ * gpiod_apply_line_init - Apply one-shot line initialization and release\n+ * @desc:\tgpio whose value will be assigned\n+ * @name:\tinitialization label\n+ * @lflags:\tbitmask of gpio_lookup_flags GPIO_* values\n+ * @dflags:\tgpiod_flags - optional GPIO initialization flags\n+ *\n+ * Applies GPIO configuration using the descriptor APIs without keeping the line\n+ * reserved by gpiolib. After configuration, the temporary internal request is\n+ * released.\n+ *\n+ * Returns:\n+ * 0 on success, or negative errno on failure.\n+ */\n+int gpiod_apply_line_init(struct gpio_desc *desc, const char *name,\n+\t\t\t unsigned long lflags, enum gpiod_flags dflags)\n+{\n+\tstruct gpio_device *gdev = desc->gdev;\n+\tstruct gpio_desc *local_desc;\n+\tint hwnum;\n+\tint ret;\n+\n+\tCLASS(gpio_chip_guard, guard)(desc);\n+\tif (!guard.gc)\n+\t\treturn -ENODEV;\n+\n+\thwnum = gpiod_hwgpio(desc);\n+\n+\tlocal_desc = gpiochip_request_own_desc(guard.gc, hwnum, name,\n+\t\t\t\t\t lflags, dflags);\n+\tif (IS_ERR(local_desc)) {\n+\t\tret = PTR_ERR(local_desc);\n+\t\tpr_err(\"requesting init GPIO %s (chip %s, offset %d) failed, %d\\n\",\n+\t\t name ? : \"?\", gdev->label, hwnum, ret);\n+\t\treturn ret;\n+\t}\n+\n+\tgpiochip_free_own_desc(local_desc);\n+\n+\tgpiod_dbg(desc, \"line init applied as %s/%s\\n\",\n+\t\t !(dflags & GPIOD_FLAGS_BIT_DIR_SET) ? \"as-is\" :\n+\t\t (dflags & GPIOD_FLAGS_BIT_DIR_OUT) ? \"output\" : \"input\",\n+\t\t (dflags & GPIOD_FLAGS_BIT_DIR_OUT) ?\n+\t\t str_high_low(dflags & GPIOD_FLAGS_BIT_DIR_VAL) : \"?\");\n+\n+\treturn 0;\n+}\n+\n /**\n * gpiochip_free_hogs - Scan gpio-controller chip and release GPIO hog\n * @gc:\tgpio chip to act on\ndiff --git a/drivers/gpio/gpiolib.h b/drivers/gpio/gpiolib.h\nindex 3abb90385829..ed78f9d4d0af 100644\n--- a/drivers/gpio/gpiolib.h\n+++ b/drivers/gpio/gpiolib.h\n@@ -271,6 +271,9 @@ int gpio_do_set_config(struct gpio_desc *desc, unsigned long config);\n int gpiod_configure_flags(struct gpio_desc *desc, const char *con_id,\n \t\tunsigned long lflags, enum gpiod_flags dflags);\n int gpio_set_debounce_timeout(struct gpio_desc *desc, unsigned int debounce);\n+int gpiod_apply_line_init(struct gpio_desc *desc,\n+\t\t\t const char *name, unsigned long lflags,\n+\t\t\t enum gpiod_flags dflags);\n int gpiod_hog(struct gpio_desc *desc, const char *name,\n \t\tunsigned long lflags, enum gpiod_flags dflags);\n int gpiochip_get_ngpios(struct gpio_chip *gc, struct device *dev);\ndiff --git a/drivers/of/property.c b/drivers/of/property.c\nindex 50d95d512bf5..7689c4315115 100644\n--- a/drivers/of/property.c\n+++ b/drivers/of/property.c\n@@ -1435,10 +1435,11 @@ static struct device_node *parse_gpio_compat(struct device_node *np,\n \t\treturn NULL;\n \n \t/*\n-\t * Ignore node with gpio-hog property since its gpios are all provided\n-\t * by its parent.\n+\t * Ignore nodes with gpio-hog and gpio-line properties since their gpios\n+\t * are all provided by their parent.\n \t */\n-\tif (of_property_read_bool(np, \"gpio-hog\"))\n+\tif (of_property_read_bool(np, \"gpio-hog\") ||\n+\t of_property_read_bool(np, \"gpio-line\"))\n \t\treturn NULL;\n \n \tif (of_parse_phandle_with_args(np, prop_name, \"#gpio-cells\", index,\ndiff --git a/scripts/dtc/checks.c b/scripts/dtc/checks.c\nindex 45d0213f3bf3..ee64cb4ada4f 100644\n--- a/scripts/dtc/checks.c\n+++ b/scripts/dtc/checks.c\n@@ -1533,8 +1533,8 @@ static void check_gpios_property(struct check *c,\n {\n \tstruct property *prop;\n \n-\t/* Skip GPIO hog nodes which have 'gpios' property */\n-\tif (get_property(node, \"gpio-hog\"))\n+\t/* Skip gpio-hog and gpio-line nodes which have 'gpios' property */\n+\tif (get_property(node, \"gpio-hog\") || get_property(node, \"gpio-line\"))\n \t\treturn;\n \n \tfor_each_property(node, prop) {\n", "prefixes": [ "v3", "1/1" ] }