Re: [PATCH 2/2] phy: rockchip-emmc: should be a child device of the GRF

[Shawn Lin]

在 2016/3/24 21:22, Heiko Stuebner 写道:
> The emmc-phy is fully enclosed in the general register files (GRF).
> Therefore as seen from the device-tree it shouldn't be a separate platform-
> device but instead a sub-device of the GRF - using the simply-mfd mechanism.
>
> The driver entered the kernel in the current merge-window, so we can still
> adapt the binding without needing a fallback, as the binding hasn't been
> released with a full kernel yet.
>
> Signed-off-by: Heiko Stuebner <heiko@xxxxxxxxx>
> ---
> Hi Shawn, Kishon,
>
> I didn't see this new phy driver until now, so I'd really like to get
> this sorted before the old binding solidifies :-).
>
> I'll convert the usbphy as well, but that has to have the fallback for
> the old binding, so is not as urgent as these two.
>
> As mentioned in the patch description above, this is meant as a fixup for
> kernel 4.6.
>
>
> One thing I noticed, the emmc phy is occupying the range 0xf780-0xf7a0,
> so shouldn't the reg property reflect that, like
>      reg = <0xf780 0x20>;
> to stay with common conventions?

yes, and I had a fix[0] for it waiting for Kishon's reviewing.


[0]:
http://lkml.org/lkml/2016/3/8/114

>   .../devicetree/bindings/phy/rockchip-emmc-phy.txt     | 19 ++++++++++++-------
>   drivers/phy/phy-rockchip-emmc.c                       |  5 ++++-
>   2 files changed, 16 insertions(+), 8 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt b/Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt
> index 61916f1..d711259 100644
> --- a/Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt
> +++ b/Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt
> @@ -3,17 +3,22 @@ Rockchip EMMC PHY
>
>   Required properties:
>    - compatible: rockchip,rk3399-emmc-phy
> - - rockchip,grf : phandle to the syscon managing the "general
> -   register files"
>    - #phy-cells: must be 0
>    - reg: PHY configure reg address offset in "general
>      register files"
>
>   Example:
>
> -emmcphy: phy {
> -	compatible = "rockchip,rk3399-emmc-phy";
> -	rockchip,grf = <&grf>;
> -	reg = <0xf780>;
> -	#phy-cells = <0>;
> +
> +grf: syscon@ff770000 {
> +	compatible = "rockchip,rk3399-grf", "syscon", "simple-mfd";
> +
> +...
> +
> +	emmcphy: phy@f780 {
> +		compatible = "rockchip,rk3399-emmc-phy";
> +		rockchip,grf = <&grf>;
> +		reg = <0xf780>;
> +		#phy-cells = <0>;
> +	};
>   };
> diff --git a/drivers/phy/phy-rockchip-emmc.c b/drivers/phy/phy-rockchip-emmc.c
> index 887b4c2..6ebcf3e 100644
> --- a/drivers/phy/phy-rockchip-emmc.c
> +++ b/drivers/phy/phy-rockchip-emmc.c
> @@ -176,7 +176,10 @@ static int rockchip_emmc_phy_probe(struct platform_device *pdev)
>   	struct regmap *grf;
>   	unsigned int reg_offset;
>
> -	grf = syscon_regmap_lookup_by_phandle(dev->of_node, "rockchip,grf");
> +	if (!dev->parent || !dev->parent->of_node)
> +		return -ENODEV;
> +
> +	grf = syscon_node_to_regmap(dev->parent->of_node);
>   	if (IS_ERR(grf)) {
>   		dev_err(dev, "Missing rockchip,grf property\n");
>   		return PTR_ERR(grf);


--
Best Regards
Shawn Lin