linux-kernel - Re: [PATCH v2 3/6] dt/bindings: Add bindings for Tegra GMI controller

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Date:   Wed, 24 Aug 2016 21:54:47 +0200
From:   Mirza Krak <mirza.krak@...il.com>
To:     Jon Hunter <jonathanh@...dia.com>
Cc:     Stephen Warren <swarren@...dotorg.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Alexandre Courbot <gnurou@...il.com>, linux@...linux.org.uk,
        pdeschrijver@...dia.com, Prashant Gaikwad <pgaikwad@...dia.com>,
        Michael Turquette <mturquette@...libre.com>,
        sboyd@...eaurora.org, robh+dt@...nel.org, mark.rutland@....com,
        devicetree@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-clk@...r.kernel.org
Subject: Re: [PATCH v2 3/6] dt/bindings: Add bindings for Tegra GMI controller

2016-08-24 17:56 GMT+02:00 Jon Hunter <jonathanh@...dia.com>:
+
>> +Example with two SJA1000 CAN controllers connected to the GMI bus. We wrap the
>> +controllers with a simple-bus node since they are all connected to the same
>> +chip-select (CS4), in this example external address decoding is provided:
>> +
>> +gmi@...90000 {
>> +     compatible = "nvidia,tegra20-gmi";
>> +     reg = <0x70009000 0x1000>;
>> +     #address-cells = <1>;
>> +     #size-cells = <1>;
>> +     clocks = <&tegra_car TEGRA20_CLK_NOR>;
>> +     clock-names = "gmi";
>> +     resets = <&tegra_car 42>;
>> +     reset-names = "gmi";
>> +     ranges = <4 0x48000000 0x7ffffff>;
>> +
>> +     status = "disabled";
>> +
>> +     bus@4 {
>> +             compatible = "simple-bus";
>> +             reg = <4>;
>> +             #address-cells = <1>;
>> +             #size-cells = <1>;
>> +             ranges = <0 4 0x40100>;
>
> Does this work? I tried to add an example like this and I got ...
>
> Warning (reg_format): "reg" property in /gmi@...09000/bus@4 has invalid
> length (4 bytes) (#address-cells == 1, #size-cells == 1)

Shoot, to get rid of the warning it should be

reg = <4 0 >;

But it works either way.

>
> I am wondering if we should just following the arm,pl172 example and
> have ...
>
>         cs4 {
>                 compatible = "simple-bus";
>                 #address-cells = <1>;
>                 #size-cells = <1>;
>                 ranges;
>
>                 nvidia,snor-cs = <4>;
>                 nvidia,snor-mux-mode;
>                 nvidia,snor-adv-inv;
>
>                 can@0 {
>                         reg = <0 0x100>;
>                         ...
>                 };
>
>                 ...
>         };
>

That means to go back to V1 really (almost :)). Which I do not mind.
Will give it a test run.

But I am a little hesitant if will be any better/cleaner. In your example above:

can@0 {
         reg = <0 0x100>;
         ...
};

Would this really translate correctly? In the pl172 example they have
multiple ranges and address with "flash@0,0" which a range defined in
parent node. "can@0" does not have valid match in parent node in our
example. So I probably need add some more logic for it to properly
translate.

I have an idea which is following:

gmi@...90000 {
         status = "okay";
         #address-cells = <2>;
         #size-cells = <1>;
         ranges = <4 0 0x48000000 0x00040000>;

         cs4 {
                 compatible = "simple-bus";
                 #address-cells = <2>;
                 #size-cells = <1>;
                 ranges;

                 nvidia,snor-cs = <4>;
                 nvidia,snor-mux-mode;
                 nvidia,snor-adv-inv;

                 can@0 {
                         compatible = "nxp,sja1000";
                         reg = <4 0 0x100>;
                         ...
                 };


                 can@...00 {
                         compatible = "nxp,sja1000";
                         reg = <4 0x40000 0x100>;
                         ...
                 };
         };
};

Do not know if above will work at all (not able to test at current
location), anyway I will play around with it some more and get back to
you.

Best Regards
Mirza