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Thu, 27 Aug 2026 03:54:12 -0700 (PDT) Date: Thu, 27 Aug 2026 03:54:09 -0700 From: Dmitry Torokhov To: Maurizio Casciano Cc: linux-input@vger.kernel.org, Liam Girdwood , Mark Brown , David Heidelberg , linux-kernel@vger.kernel.org Subject: Re: [PATCH 1/2] Input: drv260x: Make vbat supply optional Message-ID: References: <20260826132211.3341936-1-mauriziocasciano7@gmail.com> <20260826132211.3341936-2-mauriziocasciano7@gmail.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: <20260826132211.3341936-2-mauriziocasciano7@gmail.com> Hi Maurizio, On Wed, Aug 26, 2026 at 03:22:10PM +0200, Maurizio Casciano wrote: > The Lenovo Yoga Book YB1-X91L firmware instantiates two DRV2604 > ACPI devices, but does not describe a software-controllable vbat supply > for either device. The generic regulator lookup therefore creates a > dummy supply. Yes, that is how most of the drivers handle supplies on ACPI systems. > > Use the optional regulator lookup and skip regulator operations when no > supply is described. Systems which provide vbat retain the existing > enable, managed-disable, suspend, resume, and error-unwind behavior. regulator_get_optional() should only be used in cases where supply can be left unconnected in normal use. This is different from this case where supply *is connected* but it is managed by ACPI/board firmware. IOW this patch is not needed. Thanks. -- Dmitry