linux-kernel - Re: [PATCH 3/4] ARM: dts: berlin: add the SDHCI nodes for the BG2Q

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Date:	Thu, 17 Apr 2014 11:33:06 +0800
From:	Jisheng Zhang <jszhang@...vell.com>
To:	Antoine Ténart 
	<antoine.tenart@...e-electrons.com>
CC:	"sebastian.hesselbarth@...il.com" <sebastian.hesselbarth@...il.com>,
	"chris@...ntf.net" <chris@...ntf.net>,
	"anton@...msg.org" <anton@...msg.org>,
	"alexandre.belloni@...e-electrons.com" 
	<alexandre.belloni@...e-electrons.com>,
	Jimmy Xu <zmxu@...vell.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/4] ARM: dts: berlin: add the SDHCI nodes for the BG2Q

Hi Antoine,

On Wed, 16 Apr 2014 05:40:10 -0700
Antoine Ténart <antoine.tenart@...e-electrons.com> wrote:

> Add the SDHCI nodes for the Marvell Berlin BG2Q, using the berlin-sdhci
> driver.
> 
> Signed-off-by: Antoine Ténart <antoine.tenart@...e-electrons.com>
> ---
>  arch/arm/boot/dts/berlin2q.dtsi | 40
> ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/berlin2q.dtsi
> b/arch/arm/boot/dts/berlin2q.dtsi index 5925e6a16749..8f897d461460 100644
> --- a/arch/arm/boot/dts/berlin2q.dtsi
> +++ b/arch/arm/boot/dts/berlin2q.dtsi
> @@ -67,6 +67,14 @@
>  		clock-div = <3>;
>  	};
>  
> +	sdio1clk: sdio1clk {
> +		compatible = "fixed-factor-clock";
> +		#clock-cells = <0>;
> +		clocks = <&syspll>;
> +		clock-mult = <1>;
> +		clock-div = <4>;
> +	};
> +
>  	soc {
>  		compatible = "simple-bus";
>  		#address-cells = <1>;
> @@ -75,6 +83,38 @@
>  		ranges = <0 0xf7000000 0x1000000>;
>  		interrupt-parent = <&gic>;
>  
> +		sdhci0: sdhci@...000 {
> +			compatible = "marvell,berlin2q-sdhci";
> +			reg = <0xab0000 0x200>;
> +			clocks = <&sdio1clk>;
> +			interrupts = <GIC_SPI 17 IRQ_TYPE_LEVEL_HIGH>;
> +			keep-power-in-suspend;
> +			enable-sdio-wakeup;
> +			broken-cd;
> +			status = "disabled";
> +		};
> +
> +		sdhci1: sdhci@...800 {
> +			compatible = "marvell,berlin2q-sdhci";
> +			reg = <0xab0800 0x200>;
> +			clocks = <&sdio1clk>;
> +			interrupts = <GIC_SPI 20 IRQ_TYPE_LEVEL_HIGH>;
> +			keep-power-in-suspend;
> +			enable-sdio-wakeup;
> +			status = "disabled";
> +		};
> +
> +		sdhci2: sdhci@...000 {
> +			compatible = "marvell,berlin2q-sdhci";
> +			reg = <0xab1000 0x200>;
> +			interrupts = <GIC_SPI 28 IRQ_TYPE_LEVEL_HIGH>;
> +			clocks = <&sdio1clk>;
> +			keep-power-in-suspend;
> +			enable-sdio-wakeup;
> +			broken-cd;
> +			status = "disabled";
> +		};

could we put sdhci@...000 at the first of sdhci lists? For two reasons:

1. sdhci@...000 and sdhci@...800 is called as sdhci1 and sdhci2 in mrvl
internal discussion, so this would make the name consistent when we
upgrade linux kernel to one mainline version.

2. sdhci@...000 is always used for emmc. if sdhci@...800 is put at the
head of sdhci@...000, and there's one sdcard in it, mmcblock0 would be
the sdcard rather than emmc.

I dunno whether there's elegant solutions for these two issues. alias? Could
anyone kindly help?

Thanks in advance,
Jisheng
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