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Fri, 27 Feb 2026 01:50:47 -0800 (PST) X-Received: by 2002:a05:6a00:3d48:b0:821:8145:6948 with SMTP id d2e1a72fcca58-8274da51b38mr1657286b3a.7.1772185847252; Fri, 27 Feb 2026 01:50:47 -0800 (PST) Received: from [10.218.41.33] ([202.46.22.19]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-82739d4dc6dsm4732240b3a.6.2026.02.27.01.50.42 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 27 Feb 2026 01:50:46 -0800 (PST) Message-ID: <1b34bdcf-79fa-45c1-8ca8-8610c15741af@oss.qualcomm.com> Date: Fri, 27 Feb 2026 15:20:40 +0530 Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 1/1] arm64: dts: qcom: monaco-evk: Add Interface Plus Mezzanine To: Dmitry Baryshkov , Krzysztof Kozlowski Cc: Bjorn Andersson , konradybcio@kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, richardcochran@gmail.com, linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, mohd.anwar@oss.qualcomm.com, krishna.chundru@oss.qualcomm.com, monish.chunara@oss.qualcomm.com References: <20260222173545.3627478-1-umang.chheda@oss.qualcomm.com> <20260222173545.3627478-2-umang.chheda@oss.qualcomm.com> <87e3de23-cee9-4789-87ca-e85826af7760@kernel.org> <2pcw4qrgxu2fwhssyf3plu6h4anwiofvdx3ppnfbngibfm5lxz@7ixcrh5jk4t3> Content-Language: en-US From: Umang Chheda In-Reply-To: <2pcw4qrgxu2fwhssyf3plu6h4anwiofvdx3ppnfbngibfm5lxz@7ixcrh5jk4t3> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Authority-Analysis: v=2.4 cv=WZwBqkhX c=1 sm=1 tr=0 ts=69a168f8 cx=c_pps a=WW5sKcV1LcKqjgzy2JUPuA==:117 a=fChuTYTh2wq5r3m49p7fHw==:17 a=IkcTkHD0fZMA:10 a=HzLeVaNsDn8A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=Um2Pa8k9VHT-vaBCBUpS:22 a=40BG639Icp96ZrZOFxkA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=OpyuDcXvxspvyRM73sMx:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMjI3MDA4MyBTYWx0ZWRfX6wT2O184xvlG e5kzj0ECpLl4qpXc44goh3aRMMOXA8fXx2OEMQNWoJegzEOBwfk0FgoJsTeodgcxjZcVPHnIgYB XoRgM4u98BdMSeLSkT6f0J4LRzk5AfoeggIBh61T4W+6cZ7+p0h6muW/AuaABI3/6qtt6qVH7CZ kr6ikh+2+6Jjz6nX11IzmdWMtZ5AW8GOtMOIUN1sPqEkWmiJDIeZb/X39zD2rx9uVQSK+pC8+5O +bP58hJktuZKGu/2EiuNmfkF2IV1KSQub6W4OFSTQXMpN6jc5XaeaWKZ7xRSEzlmvcKOPrgE9Te QFNJGN3GeeP1cFCR+MqvxEjfw3tEKgjXPHZDBlUqGtrUdLATdn++aefQIeMxwonTKaittAibn1R cbGlzGxSE6sp8wuxhwcnPXWglVV0ioxsQQJW8rgEK9d/xAfobBElEqTF+pgXHqDXQo7etC/x0mL ZEamSkMgjYfCIUDad7Q== X-Proofpoint-ORIG-GUID: rnKT-iN36Z0KVP4NQCg0bvdSUZ446APR X-Proofpoint-GUID: rnKT-iN36Z0KVP4NQCg0bvdSUZ446APR X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-02-27_01,2026-02-26_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 lowpriorityscore=0 phishscore=0 priorityscore=1501 bulkscore=0 clxscore=1015 malwarescore=0 adultscore=0 impostorscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2602130000 definitions=main-2602270083 Hello Krzysztof, On 2/24/2026 3:39 AM, Dmitry Baryshkov wrote: > On Mon, Feb 23, 2026 at 09:37:53PM +0100, Krzysztof Kozlowski wrote: >> On 23/02/2026 20:02, Dmitry Baryshkov wrote: >>>>> So I presume what you're saying is that we should at most declare one >>>>> level of non-controlled fixed regulators? >>>> In general, non-controller fixed regulators should not be there at all, >>>> except when they serve certain purpose, like fulfill the binding >>>> requirement. It's their only point. >>>> >>>> And a chain of: >>>> >>>> A -> B -> C -> device >>>> >>>> is completely redundant if all A+B+C are non-controlled. >>> I think that came from me. I don't consider that to be completely >>> redundant. It helps in reviews and in some understanding of the board >>> logic. I'm not asking to implement all the intermediate regulators, but >>> to implement the meaningful relationship between end-user regulators. >> These are not end-user regulators. These are fixed things which no one >> touches and no one needs. There is no single purpose for user-space to >> see them. >> >> Why do you not insist on defining all of such external oscilators, rest >> of regulators, all possible little ICs? > So, where is the boundary from you point of view? Do we define fixed > regulators powering DRM bridges / USB hubs and other similar devices? > Or do we do it only if the bindings require us to do it? Can you help share your point of view on the above query from Dmitry ? In this case to adhere to  bindings requirements Is it okay if we define fixed regulators like A - > B - > device ? Instead of defining all the intermediate regulators. > Thanks, Umang