tty: serial: msm_serial: document DT alias

Update devicetree binding for msm_serial to reflect msm_serial_probe()
getting line id (port number) from the serialN alias.

Signed-off-by: Frank Rowand <frank.rowand@sonymobile.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 47 insertions, 22 deletions

diff --git a/Documentation/devicetree/bindings/serial/qcom,msm-uartdm.txt b/Documentation/devicetree/bindings/serial/qcom,msm-uartdm.txt
index ffa5b784c66e..a2114c217376 100644
--- a/Documentation/devicetree/bindings/serial/qcom,msm-uartdm.txt
+++ b/Documentation/devicetree/bindings/serial/qcom,msm-uartdm.txt
@@ -27,27 +27,52 @@ Optional properties:
 - dmas: Should contain dma specifiers for transmit and receive channels
 - dma-names: Should contain "tx" for transmit and "rx" for receive channels
 
+Note: Aliases may be defined to ensure the correct ordering of the UARTs.
+The alias serialN will result in the UART being assigned port N.  If any
+serialN alias exists, then an alias must exist for each enabled UART.  The
+serialN aliases should be in a .dts file instead of in a .dtsi file.
+
 Examples:
 
-A uartdm v1.4 device with dma capabilities.
-
-serial@f991e000 {
-        compatible = "qcom,msm-uartdm-v1.4", "qcom,msm-uartdm";
-        reg = <0xf991e000 0x1000>;
-        interrupts = <0 108 0x0>;
-        clocks = <&blsp1_uart2_apps_cxc>, <&blsp1_ahb_cxc>;
-        clock-names = "core", "iface";
-        dmas = <&dma0 0>, <&dma0 1>;
-        dma-names = "tx", "rx";
-};
-
-A uartdm v1.3 device without dma capabilities and part of a GSBI complex.
-
-serial@19c40000 {
-        compatible = "qcom,msm-uartdm-v1.3", "qcom,msm-uartdm";
-        reg = <0x19c40000 0x1000>,
-              <0x19c00000 0x1000>;
-        interrupts = <0 195 0x0>;
-        clocks = <&gsbi5_uart_cxc>, <&gsbi5_ahb_cxc>;
-        clock-names = "core", "iface";
-};
+- A uartdm v1.4 device with dma capabilities.
+
+        serial@f991e000 {
+                compatible = "qcom,msm-uartdm-v1.4", "qcom,msm-uartdm";
+                reg = <0xf991e000 0x1000>;
+                interrupts = <0 108 0x0>;
+                clocks = <&blsp1_uart2_apps_cxc>, <&blsp1_ahb_cxc>;
+                clock-names = "core", "iface";
+                dmas = <&dma0 0>, <&dma0 1>;
+                dma-names = "tx", "rx";
+        };
+
+- A uartdm v1.3 device without dma capabilities and part of a GSBI complex.
+
+        serial@19c40000 {
+                compatible = "qcom,msm-uartdm-v1.3", "qcom,msm-uartdm";
+                reg = <0x19c40000 0x1000>,
+                <0x19c00000 0x1000>;
+                interrupts = <0 195 0x0>;
+                clocks = <&gsbi5_uart_cxc>, <&gsbi5_ahb_cxc>;
+                clock-names = "core", "iface";
+        };
+
+- serialN alias.
+
+        aliases {
+                serial0 = &uarta;
+                serial1 = &uartc;
+                serial2 = &uartb;
+        };
+
+        uarta: serial@12490000 {
+                status = "ok";
+        };
+
+        uartb: serial@16340000 {
+                status = "ok";
+        };
+
+        uartc: serial@1a240000 {
+                status = "ok";
+        };