linux-kernel - Re: [PATCH 03/12] dt-bindings: mfd: renesas,rzg3s-vbattb: Document VBATTB

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Date: Mon, 17 Jun 2024 10:10:30 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: claudiu beznea <claudiu.beznea@...on.dev>, geert+renesas@...der.be,
 mturquette@...libre.com, sboyd@...nel.org, robh@...nel.org,
 krzk+dt@...nel.org, conor+dt@...nel.org, lee@...nel.org,
 alexandre.belloni@...tlin.com, magnus.damm@...il.com
Cc: linux-renesas-soc@...r.kernel.org, linux-clk@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-rtc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
Subject: Re: [PATCH 03/12] dt-bindings: mfd: renesas,rzg3s-vbattb: Document
 VBATTB

On 17/06/2024 09:16, claudiu beznea wrote:
> 
> 
> On 16.06.2024 10:38, Krzysztof Kozlowski wrote:
>> On 14/06/2024 09:19, Claudiu wrote:
>>> From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
>>
>>> +
>>> +maintainers:
>>> +  - Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
>>> +
>>> +properties:
>>> +  compatible:
>>> +    items:
>>> +      - const: renesas,rzg3s-vbattb
>>> +      - const: syscon
>>> +      - const: simple-mfd
>>
>> No, mfd does no look good. That's not a simple device anymore and you
>> claim here child does not need vbat bclk, power domains and resets? That
>> would be a big surprise, although technically possible.
> 
> I wasn't sure how this MFD will be received by the Renesas maintainers so I
> kept it simple for this version.
> 
> In theory the VBAT clk, power domain and resets are specific to VBAT module
> itself but, indeed, the child cannot work w/o these.
> 
>>
>> Please clarify: which of parent resources are needed for children?
> 
> VBAT clock, power domain are needed. Reset, too. In the current
> implementation the reset is deasserted though parent by calling the
> syscon_node_to_regmap(np->parent) in the clock driver.

Then you must drop simple-mfd. It's not simple-mfd if children needs
parent's resources.

> 
>>
>> ...
>>
>>> +
>>> +additionalProperties: false
>>> +
>>> +examples:
>>> +  - |
>>> +    #include <dt-bindings/clock/r9a08g045-cpg.h>
>>> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
>>> +
>>> +    vbattb: vbattb@...5c000 {
>>> +        compatible = "renesas,rzg3s-vbattb", "syscon", "simple-mfd";
>>> +        reg = <0x1005c000 0x1000>;
>>> +        ranges = <0 0 0x1005c000 0 0x1000>;
>>> +        interrupts = <GIC_SPI 43 IRQ_TYPE_LEVEL_HIGH>;
>>> +        interrupt-names = "tampdi";
>>> +        clocks = <&cpg CPG_MOD R9A08G045_VBAT_BCLK>;
>>> +        clock-names = "bclk";
>>> +        power-domains = <&cpg>;
>>> +        resets = <&cpg R9A08G045_VBAT_BRESETN>;
>>> +        #address-cells = <2>;
>>> +        #size-cells = <2>;
>>> +        status = "disabled";
>>
>> Drop
> 
> Could you please clarify this? Would you want me to drop the full node
> (same for clock-controller node)?
> 
> Can you point me an example that you are thinking about?

The exact line I commented under.

There is never status in any example. Please open any other binding or
example-schema.



Best regards,
Krzysztof