Re: [PATCH v2 1/6] riscv: dts: sophgo: Put sdhci compatible in dt of specific SoC

From: Thomas Bonnefille <thomas.bonnefille@bootlin.com>
To: Yixun Lan <dlan@gentoo.org>, Inochi Amaoto <inochiama@outlook.com>
Cc: "Jisheng Zhang" <jszhang@kernel.org>,
	"Rob Herring" <robh@kernel.org>,
	"Krzysztof Kozlowski" <krzk+dt@kernel.org>,
	"Conor Dooley" <conor+dt@kernel.org>,
	"Paul Walmsley" <paul.walmsley@sifive.com>,
	"Chen Wang" <unicorn_wang@outlook.com>,
	"Chao Wei" <chao.wei@sophgo.com>,
	"Albert Ou" <aou@eecs.berkeley.edu>,
	"Palmer Dabbelt" <palmer@dabbelt.com>,
	"Samuel Holland" <samuel.holland@sifive.com>,
	"Thomas Gleixner" <tglx@linutronix.de>,
	"Daniel Lezcano" <daniel.lezcano@linaro.org>,
	"Thomas Petazzoni" <thomas.petazzoni@bootlin.com>,
	"Miquèl Raynal" <miquel.raynal@bootlin.com>,
	linux-kernel@vger.kernel.org, devicetree@vger.kernel.org,
	linux-riscv@lists.infradead.org
Subject: Re: [PATCH v2 1/6] riscv: dts: sophgo: Put sdhci compatible in dt of specific SoC
Date: Mon, 17 Jun 2024 11:16:32 +0200	[thread overview]
Message-ID: <c75601a1-1389-400e-90b9-99c1e775a866@bootlin.com> (raw)
In-Reply-To: <20240616235829.GA4000183@ofsar>

On 6/17/24 1:58 AM, Yixun Lan wrote:
> Hi
> 
> On 18:47 Wed 12 Jun     , Inochi Amaoto wrote:
>> On Wed, Jun 12, 2024 at 10:02:31AM GMT, Thomas Bonnefille wrote:
>>> Remove SDHCI compatible for CV1800b from common dtsi file to put it in
>>> the specific dtsi file of the CV1800b.
>>> This commits aims at following the same guidelines as in the other nodes
>>> of the CV18XX family.
> is there any URL of guideline? or did I miss anything
> couldn't find any discussion about this in v1
> 

Not explicitly, the fact is that I had to use a specific compatible on 
SG2002 for the sdhci (it is already defined mainline), I had to choose 
between :

1. cv18xx.dtsi : compatible cv1800b-dwcmshc
    cv1800b.dtsi : no redefined compatible
    sg2002.dtsi : overwrite the previous compatible to use sg2002-dwcmshc

2. cv18xx.dtsi : no compatible
    cv1800b.dtsi : compatible for cv1800b-dwcmshc
    sg2002.dtsi : compatible for sg2002-dwcmshc

As in the plic and clint controllers, the second option was chosen I 
consider this as a "guideline" and reformat the dtsis accordingly.

>>>
>>> Signed-off-by: Thomas Bonnefille <thomas.bonnefille@bootlin.com>
>>> ---
>>>   arch/riscv/boot/dts/sophgo/cv1800b.dtsi | 4 ++++
>>>   arch/riscv/boot/dts/sophgo/cv18xx.dtsi  | 1 -
>>>   2 files changed, 4 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/arch/riscv/boot/dts/sophgo/cv1800b.dtsi b/arch/riscv/boot/dts/sophgo/cv1800b.dtsi
>>> index ec9530972ae2..b9cd51457b4c 100644
>>> --- a/arch/riscv/boot/dts/sophgo/cv1800b.dtsi
>>> +++ b/arch/riscv/boot/dts/sophgo/cv1800b.dtsi
>>> @@ -25,3 +25,7 @@ &clint {
>>>   &clk {
>>>   	compatible = "sophgo,cv1800-clk";
>>>   };
>>> +
>>> +&sdhci0 {
>>> +	compatible = "sophgo,cv1800b-dwcmshc";
>>> +};
>>> diff --git a/arch/riscv/boot/dts/sophgo/cv18xx.dtsi b/arch/riscv/boot/dts/sophgo/cv18xx.dtsi
>>> index 891932ae470f..7247c7c3013c 100644
>>> --- a/arch/riscv/boot/dts/sophgo/cv18xx.dtsi
>>> +++ b/arch/riscv/boot/dts/sophgo/cv18xx.dtsi
>>> @@ -288,7 +288,6 @@ uart4: serial@41c0000 {
>>>   		};
>>>   
>>>   		sdhci0: mmc@4310000 {
>>> -			compatible = "sophgo,cv1800b-dwcmshc";
>>>   			reg = <0x4310000 0x1000>;
>>>   			interrupts = <36 IRQ_TYPE_LEVEL_HIGH>;
>>>   			clocks = <&clk CLK_AXI4_SD0>,
>>>
>>> -- 
>>> 2.45.2
>>>
>>
>> Hi, Jisheng,
>>
>> Is this change necessary? IIRC, the sdhci is the same across
>> the whole series.
> I tend to agree with Inochi here, if it's same across all SoC, then no bother to
> split, it will cause more trouble to maintain..
> 

To be honest, I agree with this to, but as a specific compatible for the 
SG2002 was created in commit 849e81817b9b, I thought that the best 
practice was to use it.

>>
>> Regards,
>> Inochi
> 

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