One change
On 16-11-09 01:33 AM, Yendapally Reddy Dhananjaya Reddy wrote:
Add documentation for mdio mux available in Broadcom NSP SoC
Signed-off-by: Yendapally Reddy Dhananjaya Reddy <yendapally.re...@broadcom.com>
---
.../devicetree/bindings/net/brcm,mdio-mux-nsp.txt | 57 ++++++++++++++++++++++
1 file changed, 57 insertions(+)
create mode 100644 Documentation/devicetree/bindings/net/brcm,mdio-mux-nsp.txt
diff --git a/Documentation/devicetree/bindings/net/brcm,mdio-mux-nsp.txt
b/Documentation/devicetree/bindings/net/brcm,mdio-mux-nsp.txt
new file mode 100644
index 0000000..b749a2b
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/brcm,mdio-mux-nsp.txt
@@ -0,0 +1,57 @@
+Properties for an MDIO bus multiplexer available in Broadcom NSP SoC.
+
+This MDIO bus multiplexer defines buses that could access the internal
+phys as well as external to SoCs. When child bus is selected, one needs
+to select the below properties to generate desired MDIO transaction on
+appropriate bus.
+
+Required properties in addition to the generic multiplexer properties:
+
+MDIO multiplexer node:
+- compatible: brcm,mdio-mux-iproc.
This should be brcm,mdio-mux-nsp
+- reg: Should contain registers location and length.
+- reg-names: Should contain the resource reg names.
+ - bus-ctrl: mdio bus control register address space required to
+ select the bus master. This property is not required for SoC's
+ that doesn't provide master selection.
+ - mgmt-ctrl: mdio management control register address space
+
+Sub-nodes:
+ Each bus master should be represented as a sub-node.
+
+Sub-nodes required properties:
+- reg: Bus master number. Should be 0x10 to access the external mdio devices.
+- address-cells: should be 1
+- size-cells: should be 0
+
+Every non-ethernet PHY requires a compatible property so that it could be
+probed based on this compatible string.
+
+Additional information regarding generic multiplexer properties can be found
+at- Documentation/devicetree/bindings/net/mdio-mux.txt
+
+example:
+
+ mdio_mux: mdio-mux@3f190 {
+ compatible = "brcm,mdio-mux-nsp";
+ reg = <0x3f190 0x4>,
+ <0x32000 0x4>;
+ reg-names = "bus-ctrl", "mgmt-ctrl";
+ mdio-parent-bus = <&mdio>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ mdio@0 {
+ reg = <0x0>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ usb3_phy: usb3-phy@10 {
+ compatible = "brcm,nsp-usb3-phy";
+ reg = <0x10>;
+ usb3-ctrl-syscon = <&usb3_ctrl>;
+ #phy-cells = <0>;
+ status = "disabled";
+ };
+ };
+ };
