linux-kernel - Re: [PATCH] phy: rockchip-emmc: fix compile issue on arm64 platform

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Date:	Thu, 7 Apr 2016 18:30:26 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	Shawn Lin <shawn.lin@...k-chips.com>
CC:	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] phy: rockchip-emmc: fix compile issue on arm64 platform

Hi,

On Tuesday 08 March 2016 01:54 PM, Shawn Lin wrote:
> This patch rename "reg" property to "reg_offset".
> We rename it to fix the compile issue on ARM64 platform:
> (reg_format): "reg" property in /phy has invalid length (4 bytes)
> (#address-cells == 2, #size-cells == 2)

Is the same node used for both ARM32 and ARM64 platforms?

Thanks
Kishon
> 
> This's because "reg" is very special one which should keep the
> *-cells with its parent node and can't be overwrited even if we
> do that explicitly. On 32-bit plafform, the default *-cells
> fit for what we assign to "reg". But that's not correct for 64-bit
> platform. So we can see two possible solutions to fix this problem:
> A) make phy-rockchip-emmc as a child phy node and overwrite its
> parent's #address-cells and #size-cells.
> B) avoid using this special property.
> 
> we use it just for passing on a offset for different Socs, and there's
> no requirement to change the code to make phy-rockchip-emmc as a child
> node. so choose option B) is sane.
> 
> Signed-off-by: Shawn Lin <shawn.lin@...k-chips.com>
> ---
> 
>  Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt | 4 ++--
>  drivers/phy/phy-rockchip-emmc.c                             | 2 +-
>  2 files changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt b/Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt
> index 61916f1..ed964ef 100644
> --- a/Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt
> +++ b/Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt
> @@ -6,7 +6,7 @@ Required properties:
>   - rockchip,grf : phandle to the syscon managing the "general
>     register files"
>   - #phy-cells: must be 0
> - - reg: PHY configure reg address offset in "general
> + - reg_offset: PHY configure reg address offset in "general
>     register files"
>  
>  Example:
> @@ -14,6 +14,6 @@ Example:
>  emmcphy: phy {
>  	compatible = "rockchip,rk3399-emmc-phy";
>  	rockchip,grf = <&grf>;
> -	reg = <0xf780>;
> +	reg_offset = <0xf780>;
>  	#phy-cells = <0>;
>  };
> diff --git a/drivers/phy/phy-rockchip-emmc.c b/drivers/phy/phy-rockchip-emmc.c
> index 887b4c2..3f55c0d 100644
> --- a/drivers/phy/phy-rockchip-emmc.c
> +++ b/drivers/phy/phy-rockchip-emmc.c
> @@ -186,7 +186,7 @@ static int rockchip_emmc_phy_probe(struct platform_device *pdev)
>  	if (!rk_phy)
>  		return -ENOMEM;
>  
> -	if (of_property_read_u32(dev->of_node, "reg", &reg_offset)) {
> +	if (of_property_read_u32(dev->of_node, "reg_offset", &reg_offset)) {
>  		dev_err(dev, "missing reg property in node %s\n",
>  			dev->of_node->name);
>  		return -EINVAL;
>