linux-kernel - Re: [PATCH 2/2] ARM: dts: add new compatible stream for i.MX6QP mmdc

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Date:   Wed, 2 Nov 2016 10:16:46 -0500
From:   Zhi Li <lznuaa@...il.com>
To:     Shawn Guo <shawnguo@...nel.org>
Cc:     Frank Li <Frank.Li@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        kernel list <linux-kernel@...r.kernel.org>,
        peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
        alexander.shishkin@...ux.intel.com,
        Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH 2/2] ARM: dts: add new compatible stream for i.MX6QP mmdc

On Wed, Nov 2, 2016 at 9:42 AM, Shawn Guo <shawnguo@...nel.org> wrote:
> On Tue, Oct 25, 2016 at 04:26:57PM -0500, Frank Li wrote:
>> mmdc of i.MX6QP are little difference with i.MX6Q.
>> added new compatible stream fsl,imx6qp-mmdc
>>
>> Signed-off-by: Frank Li <Frank.Li@....com>
>> ---
>>  arch/arm/boot/dts/imx6qp.dtsi | 7 +++++++
>>  1 file changed, 7 insertions(+)
>>
>> diff --git a/arch/arm/boot/dts/imx6qp.dtsi b/arch/arm/boot/dts/imx6qp.dtsi
>> index 886dbf2..e0fdd0f 100644
>> --- a/arch/arm/boot/dts/imx6qp.dtsi
>> +++ b/arch/arm/boot/dts/imx6qp.dtsi
>> @@ -85,5 +85,12 @@
>>               pcie: pcie@...1000000 {
>>                       compatible = "fsl,imx6qp-pcie", "snps,dw-pcie";
>>               };
>> +
>> +             aips-bus@...00000 {
>> +                     mmdc0: mmdc@...b0000 { /* MMDC0 */
>> +                             compatible = "fsl,imx6qp-mmdc", "fsl,imx6q-mmdc";
>
> Sine we already know that imx6qp-mmdc has a different programming model
> from imx6q-mmdc, it makes less sense to have "fsl,imx6q-mmdc" here.

PM code (Suspend and resume) use  "fsl,imx6q-mmdc" to get mmdc's base
address to do some works.

best regards
Frank Li

>
> Shawn
>
>> +                             reg = <0x021b0000 0x4000>;
>> +                     };
>> +             };
>>       };
>>  };
>> --
>> 2.5.2
>>