linux-kernel - Re: [PATCH 2/3] Arm: dts: aspeed-g6: Add sgpio node

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Date:   Wed, 28 Oct 2020 05:10:49 +0000
From:   Joel Stanley <joel@....id.au>
To:     Billy Tsai <billy_tsai@...eedtech.com>
Cc:     Rob Herring <robh+dt@...nel.org>, Andrew Jeffery <andrew@...id.au>,
        devicetree <devicetree@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-aspeed <linux-aspeed@...ts.ozlabs.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        OpenBMC Maillist <openbmc@...ts.ozlabs.org>,
        BMC-SW <BMC-SW@...eedtech.com>
Subject: Re: [PATCH 2/3] Arm: dts: aspeed-g6: Add sgpio node

On Mon, 12 Oct 2020 at 04:56, Billy Tsai <billy_tsai@...eedtech.com> wrote:
>
> Hi Joel,
>
> Thanks for the review.
>
> On 2020/10/12, 12:35 PM, Joel Stanley wrote:
>
>     > On Mon, 12 Oct 2020 at 03:32, Billy Tsai <billy_tsai@...eedtech.com> wrote:
>     > >
>     > > This patch is used to add sgpiom and sgpios nodes and add compatible
>     > > string for sgpiom.
>     >
>     > You also need to add sgpios documentation to the bindings docs.
>     >
>     > Whenever you add new device tree bindings to the kernel tree you
>     > should add documentation for them.
>     >
>     > When preparing patches for submission, use scripts/checkpatch.pl to
>     > check for common issues. It will warn you if you are adding strings
>     > that are not documented.
>     >
>     > Cheers,
>     >
>     > Joel
>     >
>    Because the driver of sgpios doesn't be implemented, so I don't know how to describe it at sgpio-aspeed.txt.
>    Can I just add  compatible string " aspeed,ast2600-sgpios " to the document for bypassing the warning of checkpatch?

Ignore the sgpios issue for now; we don't have a driver for it so
there's no need to add strings. Drop that part from your dts patch.

>     > >
>     > >  - compatible : Should be one of
>     > > -  "aspeed,ast2400-sgpio", "aspeed,ast2500-sgpio"
>     > > +  "aspeed,ast2400-sgpio", "aspeed,ast2500-sgpio", "aspeed,ast2600-sgpiom"
>     >
>     > I think we should add sgpiom strings for the ast2500 (and ast2400?)
>     > too, as this is how they should have been named in the first place:
>     >
>    If I change the document whether I also need to send the patch for sgpio driver and g5/g4.dtsi?

For the sgpiom? We already have a driver for that.

As I said above, make this about fixing the sgpio master and put aside
the sgpio slave issue for now.

Cheers,

Joel

>     > >  - compatible : Should be one of
>     > >    "aspeed,ast2400-sgpio", "aspeed,ast2500-sgpio"
>     > >   "aspeed,ast2400-sgpiom", "aspeed,ast2500-sgpiom", "aspeed,ast2600-sgpiom"