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[93.144.65.244]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-490b7c6b966sm25579115e9.2.2026.06.03.02.12.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 03 Jun 2026 02:12:18 -0700 (PDT) Date: Wed, 3 Jun 2026 11:12:16 +0200 From: Stefano Radaelli To: Frank Li Cc: linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, imx@lists.linux.dev, pierluigi.p@variscite.com, Stefano Radaelli , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH v1 1/1] arm64: dts: imx91-var-som-symphony: fix RGB_SEL handling Message-ID: References: <20260529134850.22196-1-stefano.r@variscite.com> Precedence: bulk X-Mailing-List: linux-kernel@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 Mon, Jun 01, 2026 at 04:42:32PM -0400, Frank Li wrote: > On Fri, May 29, 2026 at 03:48:50PM +0200, Stefano Radaelli wrote: > > From: Stefano Radaelli > > > > RGB_SEL is a board-level signal driven by the PCAL6408 GPIO expander on > > the Symphony carrier board. > > > > The signal needs to be driven high on the i.MX91 variant to keep the > > board in the expected display configuration. Move the handling of this > > line from a fixed regulator tied to the PCAL6408 supply to a GPIO hog on > > the correct GPIO expander. > > Look like this can't resolve your problem. gpio driver may probe later > than display, so gpio-hog may not set correct when display setup. > > Frank > > thanks for looking at this. The main issue I am trying to fix here is that the current upstream DT describes RGB_SEL on the wrong GPIO expander. The existing DT drives RGB_SEL from pca9534 GPIO 7 and also uses it as a fake supply for the pca6408. That is not correct for this board. RGB_SEL is actually connected to pca6408 GPIO 7, so the current description does not drive the intended line at all. With this change, RGB_SEL is driven by the correct GPIO controller and this fixes the hardware configuration issue I am seeing on the i.MX91 Symphpony board, making it working now as expected. Best Regards, Stefano