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Tue, 24 Mar 2026 08:07:17 -0700 (PDT) Date: Tue, 24 Mar 2026 18:07:13 +0300 From: Dan Carpenter To: Linus Walleij Cc: Tom Rini , AKASHI Takahiro , Peng Fan , Alice Guo , Marek Vasut , Greg Malysa , Michael Trimarchi , Yao Zi , Arturs Artamonovs , Anis Chali , Nathan Barrett-Morrison , Paul Barker , Utsav Agarwal , Ye Li , Valentin Caron , Vinh Nguyen , u-boot@lists.denx.de, Andy Shevchenko , Bartosz Golaszewski , arm-scmi@vger.kernel.org, linux-gpio@vger.kernel.org, Vincent Guittot , Khaled Ali Ahmed , Michal Simek , Cristian Marussi Subject: Re: [PATCH v2 3/4] scmi: pinctrl: add pinctrl driver for SCMI Message-ID: References: <1048331f5d3c8e0cdbe1542bcb65bbf942a4275b.1773256350.git.dan.carpenter@linaro.org> Precedence: bulk X-Mailing-List: linux-gpio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: On Tue, Mar 24, 2026 at 02:19:34PM +0100, Linus Walleij wrote: > On Wed, Mar 11, 2026 at 8:41 PM Dan Carpenter wrote: > > > scmi_pinctrl: protocol@19 { > > reg = <0x19>; > > pinmux1: pinmux_test { > > pinmux = <0 1 0xFFFFFFFF 18 1 > > 0 2 0xFFFFFFFF 18 1 > > 0 3 0xFFFFFFFF 18 1>; > > function = "f_gpio1"; > > groups = "grp_1", "grp_3"; > > }; > > }; > > > > Under linux the pinctrl subsystem will parse the function and group > > properties and use that to handle muxing. However, under u-boot the > > pin muxing is done using the "pinmux" property, which feeds raw SCMI > > pinctrl PINCTRL_SETTINGS_CONFIGURE commands to the server. The > > numbers are: selector, identifier, function_id, config_type, and > > config_value. In the example above, it sets pins 1, 2, and 3 to 1. > > The linux-kernel ignores this pinmux property. > > This whole thing is a bit of a hack and shortcut to make hard things > simple isn't it? I'm not disagreeing with you at all, but handling the default pinmux property is the only mandatory part of a pin controller driver in u-boot. regards, dan carpenter