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bh=ZDWcuB1GzVwbhzSL1QVAfGRHdjuyH2iDl8eV04oieo4=; b=QHkQQETaccZj1d0dt3Y6UsS20cwI/eNsd0mlw/0zm88QW+4QdO7AxXU3Ic6MomHW0TO1j85/z6X6RG8tE1dgUogtOAa7huqn67eSHNJKc1a7XtUKqeRbb2XjBNNMd3eXxGEyC/0PdBOmqS030tq7vPRlZNRroN3CY4tYgWNFm64= Received: from PAXPR04MB8749.eurprd04.prod.outlook.com (2603:10a6:102:21f::22) by PAXPR04MB8928.eurprd04.prod.outlook.com (2603:10a6:102:20f::24) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9456.11; Mon, 29 Dec 2025 12:01:18 +0000 Received: from PAXPR04MB8749.eurprd04.prod.outlook.com ([fe80::aa83:81a0:a276:51f6]) by PAXPR04MB8749.eurprd04.prod.outlook.com ([fe80::aa83:81a0:a276:51f6%4]) with mapi id 15.20.9456.013; Mon, 29 Dec 2025 12:01:18 +0000 From: Josua Mayer To: Geert Uytterhoeven CC: Ulf Hansson , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Geert Uytterhoeven , Magnus Damm , Wolfram Sang , Marc Kleine-Budde , Vincent Mailhol , Vinod Koul , Kishon Vijay Abraham I , Peter Rosin , Aaro Koskinen , Andreas Kemnade , Kevin Hilman , Roger Quadros , Tony Lindgren , Vignesh R , Janusz Krzysztofik , Andi Shyti , Mikhail Anikin , Yazan Shhady , Jon Nettleton , "linux-mmc@vger.kernel.org" , "devicetree@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "linux-renesas-soc@vger.kernel.org" , "linux-can@vger.kernel.org" , "linux-phy@lists.infradead.org" , "linux-omap@vger.kernel.org" , "linux-i2c@vger.kernel.org" Subject: Re: [PATCH v3 2/6] mux: Add helper functions for getting optional and selected mux-state Thread-Topic: [PATCH v3 2/6] mux: Add helper functions for getting optional and selected mux-state Thread-Index: AQHcafvjRT5zKouON0q90YQR/1KWr7UtgcmAgAsf64A= Date: Mon, 29 Dec 2025 12:01:17 +0000 Message-ID: References: <20251210-rz-sdio-mux-v3-0-ca628db56d60@solid-run.com> <20251210-rz-sdio-mux-v3-2-ca628db56d60@solid-run.com> In-Reply-To: Accept-Language: de-DE, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-traffictypediagnostic: PAXPR04MB8749:EE_|PAXPR04MB8928:EE_|DB1PEPF000509F5:EE_|AM9PR04MB7522:EE_ X-MS-Office365-Filtering-Correlation-Id: 85669d96-8431-45a4-15c7-08de46d1ff4d x-cloud-sec-av-info: solidrun,office365_emails,sent,inline X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam-Untrusted: BCL:0;ARA:13230040|7416014|376014|366016|1800799024|38070700021; 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X-OriginatorOrg: solid-run.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 29 Dec 2025 12:01:27.8101 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 85669d96-8431-45a4-15c7-08de46d1ff4d X-MS-Exchange-CrossTenant-Id: a4a8aaf3-fd27-4e27-add2-604707ce5b82 X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=a4a8aaf3-fd27-4e27-add2-604707ce5b82;Ip=[52.17.62.50];Helo=[eu-dlp.cloud-sec-av.com] X-MS-Exchange-CrossTenant-AuthSource: DB1PEPF000509F5.eurprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM9PR04MB7522 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251229_040133_413290_20291A05 X-CRM114-Status: UNSURE ( 8.47 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-phy@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Linux Phy Mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-phy" Errors-To: linux-phy-bounces+linux-phy=archiver.kernel.org@lists.infradead.org Am 22.12.25 um 11:08 schrieb Geert Uytterhoeven: > Hi Josua, > > On Wed, 10 Dec 2025 at 18:39, Josua Mayer wrote: >> In-tree phy-can-transceiver driver has already implemented a local >> version of devm_mux_state_get_optional. >> >> The omap-i2c driver gets and selects an optional mux in its probe >> function without using any helper. >> >> Add new helper functions covering both aforementioned use-cases: >> >> - devm_mux_state_get_optional: >> Get a mux-state if specified in dt, return NULL otherwise. >> - devm_mux_state_get_optional_selected: >> Get and select a mux-state if specified in dt, return error or NULL. >> >> Existing mux_get helper function is changed to return -ENOENT in case dt >> did not specify a mux-state or -control matching given name (if valid). >> This matches of_parse_phandle_with_args semantics which also returns >> -ENOENT if the property does nto exists, or its value is zero. >> >> The new helper functions check for ENOENT to return NULL for optional >> muxes. >> >> Commit e153fdea9db04 ("phy: can-transceiver: Re-instate "mux-states" >> property presence check") noted that "mux_get() always prints an error >> message in case of an error, including when the property is not present, >> confusing the user." >> >> The first error message covers the case that a mux name is not matched >> in dt. This is removed as the returned error code (-ENOENT) is clear. >> >> The second error message is based on of_parse_phandle_with_args return >> value. In case mux description is missing from DT, it returns -ENOENT. >> Print error message only for other error codes. >> >> This ensures that the new helper functions will not confuse the user >> either. >> >> Signed-off-by: Josua Mayer > Thanks for your patch! > >> --- a/drivers/mux/core.c >> +++ b/drivers/mux/core.c >> @@ -542,11 +542,8 @@ static struct mux_control *mux_get(struct device *dev, const char *mux_name, >> else >> index = of_property_match_string(np, "mux-control-names", >> mux_name); >> - if (index < 0) { >> - dev_err(dev, "mux controller '%s' not found\n", >> - mux_name); >> - return ERR_PTR(index); >> - } >> + if (index < 0) >> + return ERR_PTR(-ENOENT); >> } >> >> if (state) >> @@ -558,8 +555,10 @@ static struct mux_control *mux_get(struct device *dev, const char *mux_name, >> "mux-controls", "#mux-control-cells", >> index, &args); >> if (ret) { >> - dev_err(dev, "%pOF: failed to get mux-%s %s(%i)\n", >> - np, state ? "state" : "control", mux_name ?: "", index); >> + if (ret != -ENOENT) > I think the non-optional variant should still print an error message in > case of -ENOENT, else this has to be duplicated in all drivers using it. > > This is typically handled by having a non-printing core helper function, > and having printing non-optional, and non-printing/ignoring optional wrappers > around the former. I would prefer letting drivers use dev_err_probe. Silent helper functions can more easily share code between them ... If this is a strong preference I can rework the error behaviour and modify the relevant mux_state_get and mux_control_get. > >> + dev_err(dev, "%pOF: failed to get mux-%s %s(%i)\n", >> + np, state ? "state" : "control", >> + mux_name ?: "", index); >> return ERR_PTR(ret); >> } >> > Gr{oetje,eeting}s, > > Geert > -- linux-phy mailing list linux-phy@lists.infradead.org https://lists.infradead.org/mailman/listinfo/linux-phy