linux-kernel - Re: [PATCH 1/4] regulator: dt-bindings: add documentation for s2mpu05-pmic regulators

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Message-ID: <0836dfe1-f497-4d46-b93f-a7362b8c61aa@kernel.org>
Date: Wed, 5 Feb 2025 21:37:21 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Kaustabh Chakraborty <kauschluss@...root.org>
Cc: Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>,
 Rob Herring <robh@...nel.org>, Conor Dooley <conor@...nel.org>,
 Lee Jones <lee@...nel.org>, Sergey Lisov <sleirsgoevy@...il.com>,
 linux-kernel@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
 devicetree@...r.kernel.org
Subject: Re: [PATCH 1/4] regulator: dt-bindings: add documentation for
 s2mpu05-pmic regulators

On 05/02/2025 21:06, Kaustabh Chakraborty wrote:
> On 2025-02-05 08:32, Krzysztof Kozlowski wrote:
>>> +
>>> +description: |
>>> +  This is a part of device tree bindings for S2M and S5M family of Power
>>> +  Management IC (PMIC).
>>> +
>>> +  The S2MPU05 provides buck and LDO regulators.
>>> +
>>> +  See also Documentation/devicetree/bindings/mfd/samsung,s2mps11.yaml for
>>> +  additional information and example.
>>> +
>>> +patternProperties:
>>> +  # 21 LDOs
>>> +  "^LDO([1-9]|10|2[0-9]|3[0-5])$":
>>
>> Why is there a gap in LDOs?
> 
> LDOs 11-24 are not implemented in the downstream kernel driver. On further
> inspection I was able to find the register addresses, but minimum voltage
> and step values are unknown. :(


I see, there are marked for CP. Add a comment that gap in LDOs is due to
lack of datasheet and lack of control by OS.

Best regards,
Krzysztof