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[93.144.20.233]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-48725d9e85fsm34322455e9.1.2026.03.27.10.16.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 27 Mar 2026 10:16:36 -0700 (PDT) Date: Fri, 27 Mar 2026 18:16:34 +0100 From: Stefano Radaelli To: Frank Li Cc: linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org, pierluigi.p@variscite.com, Stefano Radaelli , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam Subject: Re: [PATCH v1 1/1] arm64: dts: imx91-var-dart-sonata: add RGB select supply for PCA6408 Message-ID: References: <20260327163243.17334-1-stefano.r@variscite.com> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Hi Frank, On Fri, Mar 27, 2026 at 12:51:25PM -0400, Frank Li wrote: > On Fri, Mar 27, 2026 at 05:32:43PM +0100, Stefano Radaelli wrote: > > From: Stefano Radaelli > > > > RGB_SEL controls the routing of some carrier board lines on the Sonata > > board. The two PCA6408 GPIO expanders depend on that path being enabled, > > so describe the selector as a fixed regulator and use it as their > > vcc-supply. > > Does below resolve your problem? > https://lore.kernel.org/imx/20260325-pinctrl-mux-v4-0-043c2c82e623@nxp.com/ > > So needn't hack select as regualtor > Thanks for pointing me your patch, interesting improvement! Actually, in this case RGB_SEL is not meant to model a selectable mux on the Sonata carrier. On this board it must stay asserted permanently, otherwise the downstream path to the two PCA6408 expanders is not accessible. Modeling it as a mux might be confusing for users of the DART-MX91, as as it would suggest that the routing is configurable, while on this board it is actually fixed. Best Regards, Stefano