linux-kernel - Re: [rtc-linux] Re: [PATCH v5 1/4] dt-bindings: mfd: s2mps11: add documentation for s2mps15 PMIC

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Date:	Mon, 09 Nov 2015 11:24:45 +0530
From:	Alim Akhtar <alim.akhtar@...sung.com>
To:	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	rtc-linux@...glegroups.com
Cc:	k.kozlowski.k@...il.com, lee.jones@...aro.org, broonie@...nel.org,
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
	Thomas Abraham <thomas.ab@...sung.com>,
	devicetree@...r.kernel.org
Subject: Re: [rtc-linux] Re: [PATCH v5 1/4] dt-bindings: mfd: s2mps11: add
 documentation for s2mps15 PMIC

Hi Krzysztof,

On 11/07/2015 08:39 AM, Krzysztof Kozlowski wrote:
> W dniu 07.11.2015 o 07:33, Rob Herring pisze:
>> On Fri, Oct 30, 2015 at 11:55:31AM +0530, Alim Akhtar wrote:
>>> From: Thomas Abraham <thomas.ab@...sung.com>
>>>
>>> Add dt-binding documentation for s2mps15 PMIC device. The s2mps15 device
>>> is similar to s2mps11/14 PMIC device and has 27 LDO and 10 buck regulators.
>>> This also supports RTC and three 32.768KHz clock outputs.
>>>
>>> Cc: devicetree@...r.kernel.org
>>> Signed-off-by: Thomas Abraham <thomas.ab@...sung.com>
>>> Signed-off-by: Alim Akhtar <alim.akhtar@...sung.com>
>>> ---
>>>   Documentation/devicetree/bindings/mfd/s2mps11.txt |   21 ++++++++++++++-------
>>>   1 file changed, 14 insertions(+), 7 deletions(-)
>>>
>>> diff --git a/Documentation/devicetree/bindings/mfd/s2mps11.txt b/Documentation/devicetree/bindings/mfd/s2mps11.txt
>>> index 890f0b0e1643..4c0543ceec25 100644
>>> --- a/Documentation/devicetree/bindings/mfd/s2mps11.txt
>>> +++ b/Documentation/devicetree/bindings/mfd/s2mps11.txt
>>> @@ -1,5 +1,5 @@
>>>
>>> -* Samsung S2MPS11, S2MPS13, S2MPS14 and S2MPU02 Voltage and Current Regulator
>>> +* Samsung S2MPS11/13/14/15 and S2MPU02 Voltage and Current Regulator
>>>
>>>   The Samsung S2MPS11 is a multi-function device which includes voltage and
>>>   current regulators, RTC, charger controller and other sub-blocks. It is
>>> @@ -7,8 +7,12 @@ interfaced to the host controller using an I2C interface. Each sub-block is
>>>   addressed by the host system using different I2C slave addresses.
>>>
>>>   Required properties:
>>> -- compatible: Should be "samsung,s2mps11-pmic" or "samsung,s2mps13-pmic"
>>> -	      or "samsung,s2mps14-pmic" or "samsung,s2mpu02-pmic".
>>> +- compatible: Should be one of the following
>>> +	- "samsung,s2mps11-pmic"
>>> +	- "samsung,s2mps13-pmic"
>>> +	- "samsung,s2mps14-pmic"
>>> +	- "samsung,s2mps15-pmic"
>>> +	- "samsung,s2mpu02-pmic".
>>>   - reg: Specifies the I2C slave address of the pmic block. It should be 0x66.
>>>
>>>   Optional properties:
>>> @@ -24,7 +28,7 @@ Optional properties:
>>>     unwanted buck warm reset (setting buck voltages to default values).
>>>
>>>   Optional nodes:
>>> -- clocks: s2mps11, s2mps13 and s5m8767 provide three(AP/CP/BT) buffered 32.768
>>> +- clocks: s2mps11, s2mps13, s2mps15 and s5m8767 provide three(AP/CP/BT) buffered 32.768
>>
>> s5m8767 doesn't seem to be documented. Can you please fix or remove.
>
> What exactly do you have in mind?
>
> The s5m8767-clk is already documented as part of clk-s2mps11.c driver:
> Documentation/devicetree/bindings/mfd/s2mps11.txt
>
> The main s5m8767 MFD driver is documented as part of regulator driver:
> Documentation/devicetree/bindings/regulator/s5m8767-regulator.txt
>
> Yes, this may be confusing... They S2M and S5M family devices share:
>   - main mfd driver,
>   - rtc driver,
>   - clk driver.
>
> but regulator drivers are separate.
>
Indeed things are documented but in very confusing manners, e.g. 
compatible name "samsung,s5m8767-pmic" belongs to MFD not regulator.
It should have being in */bindings/mfd/s2mps11.txt
Not sure if it make sense to change it though.

> Best regards,
> Krzysztof
>
>
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