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Fri, 09 Oct 2026 19:20:15 -0700 (PDT) Received: from setsuna.localnet ([2403:581e:d87e:0:fc2d:ed31:e80e:412d]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-896c479c2cdsm1804113b3a.55.2026.10.09.19.20.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 09 Oct 2026 19:20:14 -0700 (PDT) From: James Calligeros To: Krzysztof Kozlowski Cc: David Rhodes , Richard Fitzgerald , Martin =?UTF-8?B?UG92acWhZXI=?= , Liam Girdwood , Mark Brown , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Jaroslav Kysela , Takashi Iwai , Matthias Brugger , AngeloGioacchino Del Regno , Shenghao Ding , Kevin Lu , Baojun Xu , Sen Wang , Sven Peter , Janne Grunau , Neal Gompa , asahi@lists.linux.dev, linux-sound@vger.kernel.org, patches@opensource.cirrus.com, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org Subject: Re: [PATCH v2 02/21] ASoC: dt-bindings: cs42l42: Do not require chip power supplies Date: Sat, 10 Oct 2026 12:20:04 +1000 Message-ID: In-Reply-To: <20261009-memorable-acoustic-dalmatian-03e22a@quoll> References: <20261004-macaudio-v2-0-7b47ed6335a8@gmail.com> <20261004-macaudio-v2-2-7b47ed6335a8@gmail.com> <20261009-memorable-acoustic-dalmatian-03e22a@quoll> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20261009_192017_604638_8EA7F671 X-CRM114-Status: GOOD ( 14.50 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Friday, 9 October 2026 5:10:01=E2=80=AFpm Australian Eastern Standard Ti= me=20 Krzysztof Kozlowski wrote: > On Sun, Oct 04, 2026 at 04:03:29PM +1000, James Calligeros wrote: > > Some integrators do not expose the power rails connected to the codec > > in a way that can be expressed in the Devicetree. Do not require them > > to be specified on such platforms. >=20 > I don't understand how these cannot be expressed in Devicetree. What are > we missing? On Apple devices, the regulator(s) driving these pins are completely opaque. They are not exposed via the Apple Devicetree or any other discoverable interface, and they are not controllable. As far as we can tell, the pins in question are powered whenever the machine is powered on.