linux-kernel - Re: [PATCH 05/12] arm64: dts: Add I2C nodes for Hi3660

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Message-ID: <CAL_JsqJUH-TOufw=dtpgDww_VEvyTW_LZuSQqRSU-cYbAqfJ6A@mail.gmail.com>
Date:   Tue, 23 May 2017 07:48:10 -0500
From:   Rob Herring <robh@...nel.org>
To:     zhangfei <zhangfei.gao@...aro.org>
Cc:     Guodong Xu <guodong.xu@...aro.org>, Wei Xu <xuwei5@...ilicon.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        Chen Feng <puck.chen@...ilicon.com>,
        Jiancheng Xue <xuejiancheng@...ilicon.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 05/12] arm64: dts: Add I2C nodes for Hi3660

On Tue, May 23, 2017 at 12:55 AM, zhangfei <zhangfei.gao@...aro.org> wrote:
> Hi, Rob
>
>
> Thanks for the review.
>
>
> On 2017年05月23日 08:39, Rob Herring wrote:
>>
>> On Wed, May 17, 2017 at 04:37:38PM +0800, Guodong Xu wrote:
>>>
>>> From: Zhangfei Gao <zhangfei.gao@...aro.org>
>>>
>>> Add I2C nodes for Hi3660-hikey960.
>>>
>>> On HiKey960,
>>> I2C0, I2C7 is connected to Low Speed Expansion Connector.
>>> I2C1 is connected to ADV7535.
>>> I2C3 is connected to USB5734.

[...]

>>> diff --git a/arch/arm64/boot/dts/hisilicon/hi3660.dtsi
>>> b/arch/arm64/boot/dts/hisilicon/hi3660.dtsi
>>> index f55710a..f217c9d 100644
>>> --- a/arch/arm64/boot/dts/hisilicon/hi3660.dtsi
>>> +++ b/arch/arm64/boot/dts/hisilicon/hi3660.dtsi
>>> @@ -186,6 +186,62 @@
>>>                         #reset-cells = <2>;
>>>                 };
>>>   +             i2c0: i2c@...71000 {
>>
>> lowercase hex please.
>
> Yes, will change
>>
>>
>>> +                       compatible = "snps,designware-i2c";
>>
>> These should have an SoC specific compatible.
>
> We directly use drivers/i2c/busses/i2c-designware-platdrv.c,
> do we still an soc specific compatible?

It's fine if the driver uses the snps compatible, but the dts should
still have an SoC specific one.

> Checked arch/arm64/boot/dts/amd/amd-seattle-soc.dtsi, and other examples,
>
> compatible = "snps,designware-i2c" is used.

That was a mistake in the other platforms. We shouldn't continue repeating it.

Rob