linux-kernel - Re: [PATCH 3/5] ARM64: dts: meson-axg: add I2C DT info for Meson-AXG SoC

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Date:   Fri, 17 Nov 2017 22:02:32 +0800
From:   Yixun Lan <yixun.lan@...ogic.com>
To:     Neil Armstrong <narmstrong@...libre.com>,
        Wolfram Sang <wsa@...-dreams.de>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        <linux-i2c@...r.kernel.org>, <devicetree@...r.kernel.org>,
        Kevin Hilman <khilman@...libre.com>
CC:     <yixun.lan@...ogic.com>, Jerome Brunet <jbrunet@...libre.com>,
        Carlo Caione <carlo@...one.org>, Jian Hu <jian.hu@...ogic.com>,
        <linux-amlogic@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/5] ARM64: dts: meson-axg: add I2C DT info for Meson-AXG
 SoC

Hi Neil

see my comments in line

On 11/17/17 21:05, Neil Armstrong wrote:
> Hi Yixun, Jian,
> 
> On 17/11/2017 09:02, Yixun Lan wrote:
>> From: Jian Hu <jian.hu@...ogic.com>
>>
>> There are four I2C masters in EE domain, and one I2C Master in
>> AO domain, the DT info here should describe them all.
>>
>> Signed-off-by: Jian Hu <jian.hu@...ogic.com>
>> Signed-off-by: Yixun Lan <yixun.lan@...ogic.com>
>> ---
>>  arch/arm64/boot/dts/amlogic/meson-axg.dtsi | 59 ++++++++++++++++++++++++++++++
>>  1 file changed, 59 insertions(+)
>>
>> diff --git a/arch/arm64/boot/dts/amlogic/meson-axg.dtsi b/arch/arm64/boot/dts/amlogic/meson-axg.dtsi
>> index 57faaa9d8013..99e967aff439 100644
>> --- a/arch/arm64/boot/dts/amlogic/meson-axg.dtsi
>> +++ b/arch/arm64/boot/dts/amlogic/meson-axg.dtsi
>> @@ -129,6 +129,54 @@
>>  				#reset-cells = <1>;
>>  			};
>>  
>> +			i2c_m0: i2c@...00 {
> 
> Can you use a more simple "i2c0" phandle naming instead ? or get back to the "i2c_A/B/C/D" naming like in meson_gx to keep consistency ?
> 
Ok, I would prefer to use 'i2c0' then

we had a internal discussion about the inconsistent naming of the I2C
controller, and reach a consensus to name them as:
 the EE domain: ee_i2c_m0, ee_i2c_m1 ..
 the AO domain: ao_i2c_m0, ao_i2c_s0
in the future datasheet.

note: 'ee' means the EE domain, m0 mean the master 0, s0 mean the I2C
slave 0


> [...]
> 
>> +			};
>> +
>> +			i2c_m1: i2c@...00 {
> 
> [...]
> 
>> +			};
>> +
>> +			i2c_m2: i2c@...00 {
> 
> [...]
> 
>> +			};
>> +
>> +			i2c_m3: i2c@...00 {
> 
> [...]
> 
>> +			};
>> +
>>  			uart_A: serial@...00 {
>>  				compatible = "amlogic,meson-gx-uart", "amlogic,meson-uart";
>>  				reg = <0x0 0x24000 0x0 0x14>;
>> @@ -312,6 +360,17 @@
>>  				};
>>  			};
>>  
>> +			i2c_ao: i2c@...0 {
> 
> Can you keep the same "i2c_AO" as in meson-gx ?
> 
> 
sure, can do

> [...]
> 
>> +			};
>> +
>>  			uart_AO: serial@...0 {
>>  				compatible = "amlogic,meson-gx-uart", "amlogic,meson-ao-uart";
>>  				reg = <0x0 0x3000 0x0 0x18>;
>>
> 
> Neil
> 
> .
>