[PATCH 2/3] phy: rockchip-emmc: should be a child device of the GRF

[Kishon Vijay Abraham I]

From: Heiko Stuebner <he...@sntech.de>

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 <he...@sntech.de>
Acked-by: Rob Herring <r...@kernel.org>
Reviewed-by: Shawn Lin <shawn....@rock-chips.com>
Signed-off-by: Kishon Vijay Abraham I <kis...@ti.com>
---
 .../devicetree/bindings/phy/rockchip-emmc-phy.txt  |   18 +++++++++++-------
 drivers/phy/phy-rockchip-emmc.c                    |    5 ++++-
 2 files changed, 15 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..461e958 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);
-- 
1.7.9.5