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Thu, 09 Apr 2026 22:40:29 -0700 (PDT) X-Received: by 2002:a17:90b:2e84:b0:35d:a0b7:9608 with SMTP id 98e67ed59e1d1-35e42768bfemr1877286a91.7.1775799628889; Thu, 09 Apr 2026 22:40:28 -0700 (PDT) Received: from [10.218.15.94] ([202.46.22.19]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-35e41345f63sm1765599a91.16.2026.04.09.22.40.24 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 09 Apr 2026 22:40:28 -0700 (PDT) Message-ID: <8d97669b-7bde-4a21-8131-0907554f534e@oss.qualcomm.com> Date: Fri, 10 Apr 2026 11:10:22 +0530 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2] ASoC: codecs: wcd937x: Add conditional regulator control for wcd937x To: Mark Brown Cc: Srinivas Kandagatla , Liam Girdwood , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Jaroslav Kysela , Takashi Iwai , linux-sound@vger.kernel.org, linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260402072256.2811085-1-karthik.s@oss.qualcomm.com> Content-Language: en-US From: Karthik S In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Proofpoint-GUID: GgjwbIGUZAgcB0aJ4HH6i_lZYvxS7-jK X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDEwMDA1MCBTYWx0ZWRfX1YsJ+xM05UVy dEYmzxCA8N89QvAo0BsUQiGkdsQIqDocYGFp/7cC/LshXVfopM9oJh9AJiePC2ooMA7LMPcqDkN haiAH+HddIQdHAaBER8ndG1mJQ5p5djNdXlIlUW90Ac2z2ye7Nb8KpmE4FKLN7XGWFya061eLAt CjqfEp/JXENRNMoyzNQOqdxUXwXie+2tLN7IjX36xgb5QRQ1oBM2gE/4HaOFrMbT0WAqV6dfw39 j5Qlp5cv3p+sqsSnduEHDaJjihfdC4ZTiVG36m7D+xT/c1VBUvN2wneGdKcBT3K4aOgqaJ/NE2G 8xTyO9zF7x6yKdXta8J5JPm2bSHmKMG7zxNMFq+TTyHI/e6EHlUKEgvm/gEf0ti4jaAMD2JfZpR MklW0ibFPmFisqQWHJhIA51F4F2596/XZ1H9ejMQef6RVwUeK6XC6P3FcCN6uygN/Gq7YQgCzrs jHUwB8uVeBkyTBG8TyQ== X-Proofpoint-ORIG-GUID: GgjwbIGUZAgcB0aJ4HH6i_lZYvxS7-jK X-Authority-Analysis: v=2.4 cv=DslmPm/+ c=1 sm=1 tr=0 ts=69d88d4e cx=c_pps a=0uOsjrqzRL749jD1oC5vDA==:117 a=fChuTYTh2wq5r3m49p7fHw==:17 a=IkcTkHD0fZMA:10 a=A5OVakUREuEA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=yx91gb_oNiZeI1HMLzn7:22 a=Tjl11wupZS1xL07QWgYA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=ZXulRonScM0A:10 a=mQ_c8vxmzFEMiUWkPHU9:22 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-04-10_01,2026-04-09_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 lowpriorityscore=0 suspectscore=0 adultscore=0 malwarescore=0 clxscore=1015 impostorscore=0 bulkscore=0 priorityscore=1501 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604010000 definitions=main-2604100050 Hi @Mark , On the indus mezz skew, The codec rails are distributed through fixed Vdd (3.3V supply). These rails are Board‑controlled , not switched by the codec and not power‑cycled dynamically. There is no per‑codec enable/disable control exposed to software.The codec is wired to rails that are always powered when the board is powered. Hence this justifies it being handled as a board dt property. On 4/2/2026 4:53 PM, Mark Brown wrote: > On Thu, Apr 02, 2026 at 12:52:56PM +0530, karthik.s wrote: >> Add has_always_on_supplies for managing regulators. Indicates that the >> codec power supplies are provided by the board as always-on rails and >> are not switchable by the codec or its associated regulators. This implies >> that the codec supply regulators are always enabled by the system and >> must not be requested or enabled by the codec driver. > Same issue, why would we want this? Thanks and regards, Karthik S