Subject: Re: [PATCH v2 2/3] phy: rockchip-emmc: should be a child device of
 the GRF
To: Heiko Stuebner <heiko@sntech.de>, kishon@ti.com
References: <1458854943-17388-1-git-send-email-heiko@sntech.de>
 <1458854943-17388-2-git-send-email-heiko@sntech.de>
Cc: shawn.lin@rock-chips.com, linux-rockchip@lists.infradead.org,
        linux-kernel@vger.kernel.org, ykk@rock-chips.com,
        devicetree@vger.kernel.org, robh+dt@kernel.org, pawel.moll@arm.com,
        mark.rutland@arm.com, ijc+devicetree@hellion.org.uk,
        galak@codeaurora.org
From: Shawn Lin <shawn.lin@rock-chips.com>
Message-ID: <56F9E00A.8040303@rock-chips.com>
Date: Tue, 29 Mar 2016 09:53:14 +0800
User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:38.0) Gecko/20100101
 Thunderbird/38.7.0
MIME-Version: 1.0
In-Reply-To: <1458854943-17388-2-git-send-email-heiko@sntech.de>
Content-Type: text/plain; charset=gbk; format=flowed
Content-Transfer-Encoding: 8bit
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 2878
Lines: 88

?? 2016/3/25 5:29, Heiko Stuebner д??:
> 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@sntech.de>
> ---
> 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.
>
>

Reviewed-by: Shawn Lin <shawn.lin@rock-chips.com>

> changes in v2: drop forgotten rockchip,grf from example
>
>
>   .../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 +3,21 @@ 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";
> +		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