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Tue, 25 Aug 2026 09:06:56 -0700 (PDT) Date: Tue, 25 Aug 2026 18:06:53 +0200 From: Stefano Radaelli To: Frank Li Cc: sashiko-reviews@lists.linux.dev, Frank.Li@kernel.org, robh@kernel.org, imx@lists.linux.dev, conor+dt@kernel.org, devicetree@vger.kernel.org Subject: Re: [PATCH v4 2/3] ARM: dts: imx7d: add Variscite VAR-SOM-MX7 support Message-ID: References: <2b7fabe6b1c4d08e58d2542742492564b67c4c32.1787586961.git.stefano.r@variscite.com> <20260825071648.B547C1F000E9@smtp.kernel.org> 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: On Tue, Aug 25, 2026 at 09:43:05AM -0500, Frank Li wrote: > > > > [Severity: Medium] > > Does this GPIO hog conflict with the native usdhc3 pinctrl configuration > > for SD3_RESET_B? > > > > The sd3-pwr-hog statically claims gpio6 11, which corresponds to > > MX7D_PAD_SD3_RESET_B. The pinctrl_usdhc3 later claims the exact same pad as > > SD3_RESET_B in its native mode. > > > > Is it true? It's true, I'll fix it. > > > [Severity: High] > > Does setting the sw1a maximum voltage to 3.3V violate the hardware limits > > for the i.MX7D core voltage? > > > > The sw1a regulator supplies the cpu0 and cpu1 cores. The PFUZE3000 SW1A limit > > for this design is typically around 1.475V, and the absolute maximum rating > > for the i.MX7D ARM cores is usually around 1.15V. > > > > If a driver scales the core voltage up to 3.3V based on these boundaries, > > could this result in hardware damage? > > Please double check this one? > I double-checked this. PFUZE3000 SW1A supports selector values up to 3.3 V; the 1.475V limit applies to SW1B, not SW1A. The regulator-max-microvolt value only defines the regulator constraint, while the actual CPU voltage is selected according to the i.MX7 OPP table. Therefore, the 3.3 V constraint does not cause the CPU supply to be driven to 3.3 V. Best Regards, Stefano