linux-kernel - Re: [PATCH 1/3] Documentation: dtb: xgene: Add PMD clock binding

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Message-ID: <CAFHUOYxUh5dCkjJddfJy1ODR5p4P9v7C=8dxEvsbnJ6mPiscXQ@mail.gmail.com>
Date:   Mon, 29 Aug 2016 09:05:29 -0700
From:   Hoan Tran <hotran@....com>
To:     Rob Herring <robh@...nel.org>
Cc:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-clk <linux-clk@...r.kernel.org>,
        Devicetree List <devicetree@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        linux-arm-kernel@...ts.infradead.org, Loc Ho <lho@....com>,
        Duc Dang <dhdang@....com>
Subject: Re: [PATCH 1/3] Documentation: dtb: xgene: Add PMD clock binding

Hi Rob,



On Mon, Aug 29, 2016 at 8:42 AM, Rob Herring <robh@...nel.org> wrote:
> On Tue, Aug 23, 2016 at 08:52:39AM -0700, Hoan Tran wrote:
>> Add APM X-Gene clock binding documentation for PMD clock.
>>
>> Signed-off-by: Hoan Tran <hotran@....com>
>> ---
>>  Documentation/devicetree/bindings/clock/xgene.txt | 22 ++++++++++++++++++++++
>>  1 file changed, 22 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/clock/xgene.txt b/Documentation/devicetree/bindings/clock/xgene.txt
>> index 82f9638..c381733 100644
>> --- a/Documentation/devicetree/bindings/clock/xgene.txt
>> +++ b/Documentation/devicetree/bindings/clock/xgene.txt
>> @@ -8,6 +8,7 @@ Required properties:
>>  - compatible : shall be one of the following:
>>       "apm,xgene-socpll-clock" - for a X-Gene SoC PLL clock
>>       "apm,xgene-pcppll-clock" - for a X-Gene PCP PLL clock
>> +     "apm,xgene-pmd-clock" - for a X-Gene PMD clock
>>       "apm,xgene-device-clock" - for a X-Gene device clock
>>       "apm,xgene-socpll-v2-clock" - for a X-Gene SoC PLL v2 clock
>>       "apm,xgene-pcppll-v2-clock" - for a X-Gene PCP PLL v2 clock
>> @@ -22,6 +23,17 @@ Required properties for SoC or PCP PLL clocks:
>>  Optional properties for PLL clocks:
>>  - clock-names : shall be the name of the PLL. If missing, use the device name.
>>
>> +Required properties for PMD clocks:
>> +- reg : shall be the physical register address for the pmd clock.
>> +- clocks : shall be the input parent clock phandle for the clock.
>> +- #clock-cells : shall be set to 1.
>> +- clock-output-names : shall be the name of the clock referenced by derive
>> +  clock.
>> +- clock-shift: Bit shift of the clock register. Default is 0.
>> +- clock-width: Width of the clock register. Default is 32.
>> +Optional properties for PLL clocks:
>> +- clock-names : shall be the name of the clock. If missing, use the device name.
>> +
>>  Required properties for device clocks:
>>  - reg : shall be a list of address and length pairs describing the CSR
>>           reset and/or the divider. Either may be omitted, but at least
>> @@ -59,6 +71,16 @@ For example:
>>               type = <0>;
>>       };
>>
>> +     pmd0clk: pmd0clk {
>> +             compatible = "apm,xgene-pmd-clock";
>> +             #clock-cells = <1>;
>> +             clocks = <&pmdpll 0>;
>> +             reg = <0x0 0x7E200200 0x0 0x10>;
>> +             clock-shift = <8>;
>> +             clock-width = <3>;
>
> These should be implied by the compatible string. It's not a big deal
> for just adding this clock, but if you have lots more clocks to add then
> it is a problem. We only want leaf clocks (the ones going to devices) in
> DT unless there is only a few clocks.
>

This clock node is the clock of CPU.
A PMD has 2 CPUs, and they are using the same PMD clock.

Thanks
Hoan

> Rob