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Mon, 24 Aug 2026 06:30:13 -0700 (PDT) Received: from linaro.org ([2a02:2454:ff24:7210:8b5e:6b33:b439:3e9]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-c24966f8f2asm1311988366b.36.2026.08.24.06.30.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 24 Aug 2026 06:30:12 -0700 (PDT) Date: Mon, 24 Aug 2026 15:30:11 +0200 From: Stephan Gerhold To: Linus Walleij Cc: u-boot@lists.u-boot-project.org, Tom Rini , Stefan Hansson Subject: Re: [PATCH v5 06/13] mmc: arm_pl180: Power down card supplies at OS handoff Message-ID: References: <20260823-ux500-external-sdcard-v5-0-07ca794e2b94@kernel.org> <20260823-ux500-external-sdcard-v5-6-07ca794e2b94@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260823-ux500-external-sdcard-v5-6-07ca794e2b94@kernel.org> X-BeenThere: u-boot@lists.u-boot-project.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: U-Boot discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: u-boot-bounces@lists.u-boot-project.org On Sun, Aug 23, 2026 at 10:39:25PM +0200, Linus Walleij wrote: > PL180 card supplies remain enabled after probing and while U-Boot is > running. They are no longer needed once control is handed to the operating > system. > > Mark the driver for removal during OS preparation and disable its VMMC and > VQMMC supplies from the remove callback. > > Signed-off-by: Linus Walleij Is it worth briefly toggling the regulator off before Linux turns it on again? Linux will typically need to turn them on again later during boot, and even if not Linux should be able to deal with unused regulators. I'm not sure it's worth adding such cleanup to U-Boot. Thanks, Stephan