linux-kernel - Re: [PATCH v5 06/15] dt-bindings: mfd: amd,pensando-elbasr: Add AMD Pensando Elba System Resource chip

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Date:   Tue, 5 Jul 2022 11:46:43 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Brad Larson <brad@...sando.io>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-mmc <linux-mmc@...r.kernel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Al Cooper <alcooperx@...il.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Arnd Bergmann <arnd@...db.de>, blarson@....com,
        Catalin Marinas <catalin.marinas@....com>,
        Gabriel Somlo <gsomlo@...il.com>, gerg@...ux-m68k.org,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Lee Jones <lee.jones@...aro.org>,
        Mark Brown <broonie@...nel.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Pratyush Yadav <p.yadav@...com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Rob Herring <robh+dt@...nel.org>, samuel@...lland.org,
        Serge Semin <fancer.lancer@...il.com>,
        suravee.suthikulpanit@....com,
        Tom Lendacky <thomas.lendacky@....com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Will Deacon <will@...nel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>
Subject: Re: [PATCH v5 06/15] dt-bindings: mfd: amd,pensando-elbasr: Add AMD
 Pensando Elba System Resource chip

On 04/07/2022 01:41, Brad Larson wrote:
> Hi Krzysztof,
> 
> On Mon, Jun 20, 2022 at 5:56 AM Krzysztof Kozlowski
> <krzysztof.kozlowski@...aro.org> wrote:
>>
>> On 13/06/2022 21:56, Brad Larson wrote:
>>> From: Brad Larson <blarson@....com>
>>>
>>> Add support for the AMD Pensando Elba SoC System Resource chip
>>> using the SPI interface.  The Elba SR is a Multi-function Device
>>> supporting device register access using CS0, smbus interface for
>>> FRU and board peripherals using CS1, dual Lattice I2C masters for
>>> transceiver management using CS2, and CS3 for flash access.
>>>
>>> Signed-off-by: Brad Larson <blarson@....com>
>>> ---
>>>  .../bindings/mfd/amd,pensando-elbasr.yaml     | 93 +++++++++++++++++++
>>>  1 file changed, 93 insertions(+)
>>>  create mode 100644 Documentation/devicetree/bindings/mfd/amd,pensando-elbasr.yaml
>> ...
>>> +
>>> +examples:
>>> +  - |
>>> +    #include <dt-bindings/reset/amd,pensando-elba-reset.h>
>>> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
>>> +
>>> +    spi0 {
>>
>> Just "spi"
> 
> Changed to spi
> 
>>> +        #address-cells = <1>;
>>> +        #size-cells = <0>;
>>> +        num-cs = <4>;
>>> +
>>> +        spi@0 {
>>
>> "spi" is for SPI controllers. Use generic name matching the device.
>> Usually this is "system-controller", however Rob pointed out your
>> inaccurate bindings and example.
> 
> Proposed the below change node in the reply to Rob.  The model I
> followed for this was the Altera mfd/altera-a10sr.c

You pointed driver, so how is it related to bindings? Do not mix Linux
implementation with the bindings.

> 
> spi@0 {
>         sr_regs@0 {
>                 rstc: reset-controller@0 {

No underscores in node names. sr_regs is not generic name.

> 
>         dw_i2c@1 {

Again, not a generic name. If it is i2c controller, should be i2c. If it
is i2c device/client, should be something generic matching class of the
device.

> 
>         lattice_i2c@2 {
> 
>         flash@3 {

This looks ok, depending on compatible.

> 
> Regards,
> Brad


Best regards,
Krzysztof