linux-kernel - Re: [PATCH] arm64: dts: rockchip: remove bus-width from mmc nodes in rk3308.dtsi

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Message-ID: <f19b6b48-2950-abca-7dee-31c24118c3ef@gmail.com>
Date:   Tue, 14 Apr 2020 13:45:00 +0200
From:   Johan Jonker <jbx6244@...il.com>
To:     Robin Murphy <robin.murphy@....com>, heiko@...ech.de
Cc:     devicetree@...r.kernel.org, robh+dt@...nel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org
Subject: Re: [PATCH] arm64: dts: rockchip: remove bus-width from mmc nodes in
 rk3308.dtsi

Hi Robin, Heiko,

If the Rockchip DT maintainers(= Heiko) agree that the new line for the
'bus-width' properties is that it should be placed in dtsi I'll produce
a version 2. Please advise what should be done with the other Rockchip
SoCs. Change them too?

Johan.

On 4/14/20 12:02 PM, Robin Murphy wrote:
> On 2020-04-13 8:36 pm, Johan Jonker wrote:
>> The 'bus-width' property for mmc nodes is defined both in
>> 'rk3308.dtsi' and 'rk3308-roc-cc.dts'.
>> In line with the other Rockchip SoCs define that in a user dts only,
>> so remove all entries from mmc nodes in 'rk3308.dtsi'.
> 
> Judging by the pinctrl entries, these represent the number of pins
> provided by the SoC itself. Obviously boards need to override that if
> for some reason they don't wire up all the available data lines, but it
> seems backwards to have every board restate the SoC's default value.
> 
> In fact, having brought it up, for this particular case the pinctrl
> setting is inherently related to the bus width, so having one without
> the other in either place doesn't smell right.
> 
> Robin.
> 
>> Signed-off-by: Johan Jonker <jbx6244@...il.com>
>> ---
>>   arch/arm64/boot/dts/rockchip/rk3308.dtsi | 3 ---
>>   1 file changed, 3 deletions(-)
>>
>> diff --git a/arch/arm64/boot/dts/rockchip/rk3308.dtsi
>> b/arch/arm64/boot/dts/rockchip/rk3308.dtsi
>> index a9b98555d..130771ede 100644
>> --- a/arch/arm64/boot/dts/rockchip/rk3308.dtsi
>> +++ b/arch/arm64/boot/dts/rockchip/rk3308.dtsi
>> @@ -587,7 +587,6 @@
>>           compatible = "rockchip,rk3308-dw-mshc",
>> "rockchip,rk3288-dw-mshc";
>>           reg = <0x0 0xff480000 0x0 0x4000>;
>>           interrupts = <GIC_SPI 76 IRQ_TYPE_LEVEL_HIGH>;
>> -        bus-width = <4>;
>>           clocks = <&cru HCLK_SDMMC>, <&cru SCLK_SDMMC>,
>>                <&cru SCLK_SDMMC_DRV>, <&cru SCLK_SDMMC_SAMPLE>;
>>           clock-names = "biu", "ciu", "ciu-drive", "ciu-sample";
>> @@ -602,7 +601,6 @@
>>           compatible = "rockchip,rk3308-dw-mshc",
>> "rockchip,rk3288-dw-mshc";
>>           reg = <0x0 0xff490000 0x0 0x4000>;
>>           interrupts = <GIC_SPI 77 IRQ_TYPE_LEVEL_HIGH>;
>> -        bus-width = <8>;
>>           clocks = <&cru HCLK_EMMC>, <&cru SCLK_EMMC>,
>>                <&cru SCLK_EMMC_DRV>, <&cru SCLK_EMMC_SAMPLE>;
>>           clock-names = "biu", "ciu", "ciu-drive", "ciu-sample";
>> @@ -615,7 +613,6 @@
>>           compatible = "rockchip,rk3308-dw-mshc",
>> "rockchip,rk3288-dw-mshc";
>>           reg = <0x0 0xff4a0000 0x0 0x4000>;
>>           interrupts = <GIC_SPI 78 IRQ_TYPE_LEVEL_HIGH>;
>> -        bus-width = <4>;
>>           clocks = <&cru HCLK_SDIO>, <&cru SCLK_SDIO>,
>>                <&cru SCLK_SDIO_DRV>, <&cru SCLK_SDIO_SAMPLE>;
>>           clock-names = "biu", "ciu", "ciu-drive", "ciu-sample";
>>