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GET /api/patches/2217321/?format=api
{ "id": 2217321, "url": "http://patchwork.ozlabs.org/api/patches/2217321/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-gpio/patch/20260327-pinctrl-mux-v5-4-d4aec9d62c62@nxp.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": "<20260327-pinctrl-mux-v5-4-d4aec9d62c62@nxp.com>", "list_archive_url": null, "date": "2026-03-27T21:34:01", "name": "[v5,4/7] pinctrl: add optional .release_mux() callback", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "3b14fd547d8223cef0804f39571ea020b2e18b4c", "submitter": { "id": 68011, "url": "http://patchwork.ozlabs.org/api/people/68011/?format=api", "name": "Frank Li", "email": "Frank.Li@nxp.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linux-gpio/patch/20260327-pinctrl-mux-v5-4-d4aec9d62c62@nxp.com/mbox/", "series": [ { "id": 497832, "url": "http://patchwork.ozlabs.org/api/series/497832/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-gpio/list/?series=497832", "date": "2026-03-27T21:33:57", "name": "pinctrl: Add generic pinctrl for board-level mux chips", "version": 5, "mbox": "http://patchwork.ozlabs.org/series/497832/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2217321/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2217321/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linux-gpio+bounces-34331-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": [ 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"DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=nxp.com; s=selector1;\n h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck;\n bh=EomKscOACz2EiMfHyFMhDh5ukwxhM8VLlPUnGrNoojg=;\n b=eA39KQavVDKv0myPOlo+zIpJ2r/FDz1Fvz86XvVgQRrUnKsuTiJYs+RDeWmOhxIKZGUJ5Iq8Sh1mVpL3DPEv95U70Nsr6muQtvUv3Ay2sVhbdtZlS24j7sAjxoQ27A3YYb5SLVLyLQ/D6slFfN/QQ0UkZwoyhVmPSXbIbp+IS6lX1+1l/hfKOTmVgHpq4bILHF2auLu9i9AvN72Z0/rPXAaAl7v5Etm0H658ZRiWOu9ZGt7qmUK6Ej9KrYIWaKPgq+dPtm/sPDyUb0j/gqOnHkqazGSPVVIYhweuBAqJcF/L8nON3klxiywLaOe4I3XyUfo5irRTR3spz75f3KvrBg==", "From": "Frank Li <Frank.Li@nxp.com>", "Date": "Fri, 27 Mar 2026 17:34:01 -0400", "Subject": "[PATCH v5 4/7] pinctrl: add optional .release_mux() callback", "Content-Type": "text/plain; charset=\"utf-8\"", "Content-Transfer-Encoding": "7bit", "Message-Id": "<20260327-pinctrl-mux-v5-4-d4aec9d62c62@nxp.com>", "References": "<20260327-pinctrl-mux-v5-0-d4aec9d62c62@nxp.com>", "In-Reply-To": "<20260327-pinctrl-mux-v5-0-d4aec9d62c62@nxp.com>", "To": "Peter Rosin <peda@axentia.se>, Linus Walleij <linusw@kernel.org>,\n Rob Herring <robh@kernel.org>, Krzysztof Kozlowski <krzk+dt@kernel.org>,\n Conor Dooley <conor+dt@kernel.org>,\n =?utf-8?b?UmFmYcWCIE1pxYJlY2tp?= <rafal@milecki.pl>,\n Sascha Hauer <s.hauer@pengutronix.de>,\n Pengutronix Kernel Team <kernel@pengutronix.de>,\n Fabio Estevam <festevam@gmail.com>", "Cc": "linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org,\n devicetree@vger.kernel.org, imx@lists.linux.dev,\n linux-arm-kernel@lists.infradead.org, Haibo Chen <haibo.chen@nxp.com>,\n Frank Li <Frank.Li@nxp.com>", "X-Mailer": "b4 0.14.2", "X-Developer-Signature": "v=1; a=ed25519-sha256; t=1774647254; l=3409;\n i=Frank.Li@nxp.com; s=20240130; h=from:subject:message-id;\n bh=84YFQG/s33y4aWmdQnO4NG1npAXRpP23tH3HW7BHAtc=;\n b=Roh+eHNTlsPrdeEK2+/2kyviVZZq+emGZ9IVm07GP7UQGqkFFV4pRsoJqfTsRyNUjh9zexlv+\n 9K5OIPt0gMNCjIL8uBZWFpxysX3SXz7MQYVaSDTdYqp7Q/2OD1tlGkT", 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"X-OriginatorOrg": "nxp.com", "X-MS-Exchange-CrossTenant-Network-Message-Id": "\n 3f730001-f66e-4794-c424-08de8c489fe5", "X-MS-Exchange-CrossTenant-AuthSource": "PA4PR04MB9366.eurprd04.prod.outlook.com", "X-MS-Exchange-CrossTenant-AuthAs": "Internal", "X-MS-Exchange-CrossTenant-OriginalArrivalTime": "27 Mar 2026 21:34:28.2674\n (UTC)", "X-MS-Exchange-CrossTenant-FromEntityHeader": "Hosted", "X-MS-Exchange-CrossTenant-Id": "686ea1d3-bc2b-4c6f-a92c-d99c5c301635", "X-MS-Exchange-CrossTenant-MailboxType": "HOSTED", "X-MS-Exchange-CrossTenant-UserPrincipalName": "\n tb1mVz2c0qQgGs7kzn/CKn+3MKQRZYwwYr/Xn68EqbDVhSBVw+oYeiCtjj7kPuQGMN7B2TQst8uXEFiN6THkZA==", "X-MS-Exchange-Transport-CrossTenantHeadersStamped": "AM9PR04MB8668" }, "content": "Add an optional .release_mux() callback to struct pinmux_ops.\n\nSome drivers acquire additional resources in .set_mux(), such as software\nlocks. These resources may need to be released when the mux function is no\nlonger active. Introducing a dedicated .release_mux() callback allows\ndrivers to clean up such resources.\n\nThe callback is optional and does not affect existing drivers.\n\nCommit 2243a87d90b42 (\"pinctrl: avoid duplicated calling\nenable_pinmux_setting for a pin\") removed the .disable() callback\nto resolve two issues:\n\n 1. desc->mux_usecount increasing monotonically\n 2. Hardware glitches caused by repeated .disable()/.enable() calls\n\nAdding .release_mux() does not reintroduce those problems. The callback is\nintended only for releasing driver-side resources (e.g. locks) and must not\nmodify hardware registers.\n\nSigned-off-by: Frank Li <Frank.Li@nxp.com>\n---\nchange in v4\n- none\n\nchange in v3\n- Add judgement about 2243a87d90b42 (\"pinctrl: avoid duplicated calling\nenable_pinmux_setting for a pin\") in commit message.\n---\n drivers/pinctrl/pinmux.c | 5 +++++\n include/linux/pinctrl/pinmux.h | 5 +++++\n 2 files changed, 10 insertions(+)", "diff": "diff --git a/drivers/pinctrl/pinmux.c b/drivers/pinctrl/pinmux.c\nindex 3a8dd184ba3d670e01a890427e19af59b65eb813..c705bc182266c596c4e6c820f5e3ffcadbbb2838 100644\n--- a/drivers/pinctrl/pinmux.c\n+++ b/drivers/pinctrl/pinmux.c\n@@ -517,6 +517,7 @@ void pinmux_disable_setting(const struct pinctrl_setting *setting)\n {\n \tstruct pinctrl_dev *pctldev = setting->pctldev;\n \tconst struct pinctrl_ops *pctlops = pctldev->desc->pctlops;\n+\tconst struct pinmux_ops *ops = pctldev->desc->pmxops;\n \tint ret = 0;\n \tconst unsigned int *pins = NULL;\n \tunsigned int num_pins = 0;\n@@ -563,6 +564,10 @@ void pinmux_disable_setting(const struct pinctrl_setting *setting)\n \t\t\t\t pins[i], desc->name, gname);\n \t\t}\n \t}\n+\n+\tif (ops->release_mux)\n+\t\tops->release_mux(pctldev, setting->data.mux.func,\n+\t\t\t\t setting->data.mux.group);\n }\n \n #ifdef CONFIG_DEBUG_FS\ndiff --git a/include/linux/pinctrl/pinmux.h b/include/linux/pinctrl/pinmux.h\nindex 094bbe2fd6fd5ea3c5fdf5b6d6d9a7639700b50b..77664937eeb273eef440988c4cf833dbc6f10758 100644\n--- a/include/linux/pinctrl/pinmux.h\n+++ b/include/linux/pinctrl/pinmux.h\n@@ -51,6 +51,8 @@ struct pinctrl_gpio_range;\n *\tare handled by the pinmux subsystem. The @func_selector selects a\n *\tcertain function whereas @group_selector selects a certain set of pins\n *\tto be used. On simple controllers the latter argument may be ignored\n+ * @release_mux: Release software resources acquired by @set_mux. This callback\n+ *\tmust not change hardware state to avoid glitches when switching mux.\n * @gpio_request_enable: requests and enables GPIO on a certain pin.\n *\tImplement this only if you can mux every pin individually as GPIO. The\n *\taffected GPIO range is passed along with an offset(pin number) into that\n@@ -80,6 +82,9 @@ struct pinmux_ops {\n \t\t\t\t unsigned int selector);\n \tint (*set_mux) (struct pinctrl_dev *pctldev, unsigned int func_selector,\n \t\t\tunsigned int group_selector);\n+\tvoid (*release_mux) (struct pinctrl_dev *pctldev,\n+\t\t\t unsigned int func_selector,\n+\t\t\t unsigned int group_selector);\n \tint (*gpio_request_enable) (struct pinctrl_dev *pctldev,\n \t\t\t\t struct pinctrl_gpio_range *range,\n \t\t\t\t unsigned int offset);\n", "prefixes": [ "v5", "4/7" ] }