linux-kernel - Re: [PATCH 05/10] dt-bindings: power: reset: Add bindings for twl6030-power

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Date:   Wed, 14 Jun 2023 15:30:05 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Mithil <bavishimithil@...il.com>,
        "robh@...nel.org" <robh@...nel.org>
Cc:     "contact@...lk.fr" <contact@...lk.fr>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "dmitry.torokhov@...il.com" <dmitry.torokhov@...il.com>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "lee@...nel.org" <lee@...nel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "linux@...linux.org.uk" <linux@...linux.org.uk>,
        "sre@...nel.org" <sre@...nel.org>,
        "tony@...mide.com" <tony@...mide.com>
Subject: Re: [PATCH 05/10] dt-bindings: power: reset: Add bindings for
 twl6030-power

On 14/06/2023 11:13, Mithil wrote:
> Subject: Re: [PATCH 05/10] dt-bindings: power: reset: Add bindings for
> twl6030-power
> 
> On Tue, Aug 23, 2022 at 12:54 AM Rob Herring <robh@...nel.org> wrote:
>>
>> On Sat, Aug 20, 2022 at 12:46:55PM +0530, Mithil Bavishi wrote:
>>> Adds documentation for the twl6030 power driver.
>>>
>>> Signed-off-by: Paul Kocialkowski <contact@...lk.fr>
>>> Signed-off-by: Mithil Bavishi <bavishimithil@...il.com>
>>> ---
>>>  .../bindings/power/reset/twl6030-power.txt    | 31 +++++++++++++++++++
>>
>> New bindings must be DT schema format.
>>
>>>  1 file changed, 31 insertions(+)
>>>  create mode 100644 Documentation/devicetree/bindings/power/reset/twl6030-power.txt
>>>
>>> diff --git a/Documentation/devicetree/bindings/power/reset/twl6030-power.txt b/Documentation/devicetree/bindings/power/reset/twl6030-power.txt
>>> new file mode 100644
>>> index 000000000..946bb3d9f
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/power/reset/twl6030-power.txt
>>> @@ -0,0 +1,31 @@
>>> +Texas Instruments TWL family (twl6030) reset and power management module
>>> +
>>> +For now, the binding only supports the complete shutdown of the system after
>>> +poweroff.
>>> +
>>> +Required properties:
>>> +- compatible : must be
>>> +       "ti,twl6030-power"
>>> +
>>> +Optional properties:
>>> +
>>> +- ti,system-power-controller: This indicates that TWL6030 is the
>>
>> We have a generic property for this.
>>
> 
> What is property is that? And how would it get implemented here?

Easy to guess...

git grep system-power-controller



> 
>>> +  power supply master of the system. With this flag, the chip will
>>> +  initiate an ACTIVE-to-OFF or SLEEP-to-OFF transition when the
>>> +  system poweroffs.
>>> +
>>> +Example:
>>> +&i2c1 {
>>> +       clock-frequency = <2600000>;
>>> +
>>> +       twl: twl@48 {
>>> +               reg = <0x48>;
>>> +               interrupts = <7>; /* SYS_NIRQ cascaded to intc */
>>> +               interrupt-parent = <&intc>;
>>> +
>>> +               twl_power: power {
>>> +                       compatible = "ti,twl6030-power";
>>> +                       ti,system-power-controller;
>>
>> Why do you need a child node here? There aren't any resources for the
>> sub-block.
>>
> 
> Just an example and how it is used on a device as well, is it fine if
> just the block is as-is?

The question is not about example. Question was why do you need child
node at all. Children without resources are usually useless.

Best regards,
Krzysztof