linux-kernel - Re: [PATCH] arm64: dts: meson-a1: add I2C nodes

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Date:   Tue, 10 Dec 2019 10:43:06 -0800
From:   Kevin Hilman <khilman@...libre.com>
To:     Jerome Brunet <jbrunet@...libre.com>,
        Jian Hu <jian.hu@...ogic.com>,
        Neil Armstrong <narmstrong@...libre.com>
Cc:     "Rob Herring" <robh@...nel.org>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Michael Turquette <mturquette@...libre.com>,
        Wolfram Sang <wsa@...-dreams.de>,
        Mark Rutland <mark.rutland@....com>,
        Jianxin Pan <jianxin.pan@...ogic.com>,
        linux-amlogic@...ts.infradead.org, linux-i2c@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: meson-a1: add I2C nodes

Jerome Brunet <jbrunet@...libre.com> writes:

> On Mon 02 Dec 2019 at 12:12, Jian Hu <jian.hu@...ogic.com> wrote:
>
>> There are four I2C controllers in A1 series,
>> Share the same comptible with AXG.The I2C nodes
>> depend on pinmux and clock controller.
>>
>> Signed-off-by: Jian Hu <jian.hu@...ogic.com>
>> ---
>>  arch/arm64/boot/dts/amlogic/meson-a1.dtsi | 149 ++++++++++++++++++++++
>>  1 file changed, 149 insertions(+)
>>
>> diff --git a/arch/arm64/boot/dts/amlogic/meson-a1.dtsi b/arch/arm64/boot/dts/amlogic/meson-a1.dtsi
>> index eab2ecd36aa8..d0a73d953f5e 100644
>> --- a/arch/arm64/boot/dts/amlogic/meson-a1.dtsi
>> +++ b/arch/arm64/boot/dts/amlogic/meson-a1.dtsi
>> @@ -16,6 +16,13 @@
>>  	#address-cells = <2>;
>>  	#size-cells = <2>;
>>  
>> +	aliases {
>> +		i2c0 = &i2c0;
>> +		i2c1 = &i2c1;
>> +		i2c2 = &i2c2;
>> +		i2c3 = &i2c3;
>> +	};
>> +
>
> I wonder if assigning i2c bus alias in the SoC dtsi is such a good idea.
>
> Such aliases are usually assigned as needed by each board design:
> meson-a1-ad401.dts in your case.

Agreed.  I don't think SoC-wide aliases are a great idea.

Kevin