[PATCH v3 1/2] dt-bindings: phy: rockchip,pcie3-phy: Document firmware-name

[Shawn Lin]

RK3568 can load an updated PHY firmware into its internal SRAM. The
firmware file is named by the optional firmware-name property; when it
is not described the microcode already present in the PHY is used.

Document the property and add it to the RK3568 example.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski at oss.qualcomm.com>
Signed-off-by: Shawn Lin <shawn.lin at rock-chips.com>
---

Changes in v3:
- add maxItems (Krzysztof)
- add Krzysztof's Reviewed-by

 .../devicetree/bindings/phy/rockchip,pcie3-phy.yaml        | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/devicetree/bindings/phy/rockchip,pcie3-phy.yaml b/Documentation/devicetree/bindings/phy/rockchip,pcie3-phy.yaml
index d7de8b527c5c..554211d22077 100644
--- a/Documentation/devicetree/bindings/phy/rockchip,pcie3-phy.yaml
+++ b/Documentation/devicetree/bindings/phy/rockchip,pcie3-phy.yaml
@@ -67,6 +67,12 @@ properties:
       minimum: 0
       maximum: 1
 
+  firmware-name:
+    description:
+      Name of the PHY firmware loaded into the internal SRAM on RK3568.
+      If omitted, the firmware already present in the PHY is used.
+    maxItems: 1
+
 required:
   - compatible
   - reg
@@ -113,4 +119,5 @@ examples:
       resets = <&cru SRST_PCIE30PHY>;
       reset-names = "phy";
       rockchip,phy-grf = <&pcie30_phy_grf>;
+      firmware-name = "rockchip/pcie3-t22-c8g2-1.6.3-202a-p7.fw";
     };
-- 
2.25.1