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:   Sun, 3 Jul 2022 16:41:41 -0700
From:   Brad Larson <brad@...sando.io>
To:     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 <krzk@...nel.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

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

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

        dw_i2c@1 {

        lattice_i2c@2 {

        flash@3 {

Regards,
Brad