linux-kernel - Re: [PATCH 11/11] arm64: dts: Add Pensando Elba SoC support

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Message-ID: <CAK9rFnzPEq1_zOnHYzTDyOOU9xRsuP-KBEFnc84cRoyfAve+Jg@mail.gmail.com>
Date:   Wed, 25 May 2022 17:19:34 -0700
From:   Brad Larson <brad@...sando.io>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Arnd Bergmann <arnd@...db.de>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Mark Brown <broonie@...nel.org>,
        Serge Semin <fancer.lancer@...il.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Olof Johansson <olof@...om.net>,
        David Clear <dac2@...sando.io>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        linux-spi <linux-spi@...r.kernel.org>,
        linux-mmc <linux-mmc@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 11/11] arm64: dts: Add Pensando Elba SoC support

Hi Krzysztof,

On Thu, Apr 7, 2022 at 12:06 PM Krzysztof Kozlowski
<krzysztof.kozlowski@...aro.org> wrote:
>
> On 07/04/2022 01:36, Brad Larson wrote:
> > Add Pensando common and Elba SoC specific device nodes
> >
> > +&spi0 {
> > +     num-cs = <4>;
> > +     cs-gpios = <0>, <0>, <&porta 1 GPIO_ACTIVE_LOW>,
> > +                <&porta 7 GPIO_ACTIVE_LOW>;
> > +     status = "okay";
> > +     spi0_cs0@0 {
>
> Generic node name needed matching the class of a devicxe.

The device on this spi bus is a FPGA with 4 functions and looking at
other projects I've changed it to a resource-controller node name.  On
cs0 there is a sub-device reset-controller added in the upcoming
patchset to enable hardware reset of the eMMC device.

> > +             compatible = "semtech,sx1301";  /* Enable spidev */
>
> This comment is a bit odd... did you just use random compatible from
> spidev instead of defining proper compatible?

Yes, because adding a compatible was nacked.  We have a driver added
(two actually, mfd and reset driver) for the next patch update.

> > +             #address-cells = <1>;
> > +             #size-cells = <1>;
>
> Why address/size cells?

Removed where not needed

> > +             spi-max-frequency = <12000000>;
> > +             reg = <0>;
>
> Please put reg just after compatible. It's the most common pattern.

Yes, moved reg to be right after compatible

> > +     };
> > +
> > +     spi0_cs1@1 {
> > +             compatible = "semtech,sx1301";
> > +             #address-cells = <1>;
> > +             #size-cells = <1>;
> > +             spi-max-frequency = <12000000>;
> > +             reg = <1>;
> > +     };
> > +
 (...)
> > +
> > +             mssoc: mssoc@...c0000 {
>
> Generic node name.

Changed to syscon

> > +                     compatible = "syscon", "simple-mfd";
>
> This does not look correct. Syscon is okay, but why do you need
> simple-mfd (there are no children here)?

Yes, removed "simple-mfd"

Regards,
Brad