ARM: tegra: add aliases and DMA requestor for serial nodes of Tegra114

Add APB DMA requestor and serial aliases for serial controller.
There are two serial drivers i.e. 8250 based simple serial driver
and APB DMA based serial driver for higher baudrate and performace.

The simple serial driver is selected by compatible value
"nvidia,tegra114-uart", "nvidia,tegra20-uart", and the APB DMA based
driver is selected by compatible value "nvidia,tegra114-hsuart",
"nvidia,tegra30-hsuart".

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>

diff --git a/arch/arm/boot/dts/tegra114.dtsi b/arch/arm/boot/dts/tegra114.dtsi
index 75fa72dbde1bdc1960fd3419a9cb00631823699d..6ce3508b96ad2fada0880132a3a0210a46beb131 100644 (file)
--- a/arch/arm/boot/dts/tegra114.dtsi
+++ b/arch/arm/boot/dts/tegra114.dtsi
@@ -4,6 +4,13 @@
        compatible = "nvidia,tegra114";
        interrupt-parent = <&gic>;
 
+       aliases {
+               serial0 = &uarta;
+               serial1 = &uartb;
+               serial2 = &uartc;
+               serial3 = &uartd;
+       };
+
        gic: interrupt-controller {
                compatible = "arm,cortex-a15-gic";
                #interrupt-cells = <3>;
@@ -98,35 +105,47 @@
                       0x70003000 0x40c>;       /* Mux registers */
        };
 
-       serial@70006000 {
+       /*
+        * There are two serial driver i.e. 8250 based simple serial
+        * driver and APB DMA based serial driver for higher baudrate
+        * and performace. To enable the 8250 based driver, the compatible
+        * is "nvidia,tegra114-uart", "nvidia,tegra20-uart" and to enable
+        * the APB DMA based serial driver, the comptible is
+        * "nvidia,tegra114-hsuart", "nvidia,tegra30-hsuart".
+        */
+       uarta: serial@70006000 {
                compatible = "nvidia,tegra114-uart", "nvidia,tegra20-uart";
                reg = <0x70006000 0x40>;
                reg-shift = <2>;
                interrupts = <0 36 0x04>;
+               nvidia,dma-request-selector = <&apbdma 8>;
                status = "disabled";
        };
 
-       serial@70006040 {
+       uartb: serial@70006040 {
                compatible = "nvidia,tegra114-uart", "nvidia,tegra20-uart";
                reg = <0x70006040 0x40>;
                reg-shift = <2>;
                interrupts = <0 37 0x04>;
+               nvidia,dma-request-selector = <&apbdma 9>;
                status = "disabled";
        };
 
-       serial@70006200 {
+       uartc: serial@70006200 {
                compatible = "nvidia,tegra114-uart", "nvidia,tegra20-uart";
                reg = <0x70006200 0x100>;
                reg-shift = <2>;
                interrupts = <0 46 0x04>;
+               nvidia,dma-request-selector = <&apbdma 10>;
                status = "disabled";
        };
 
-       serial@70006300 {
+       uartd: serial@70006300 {
                compatible = "nvidia,tegra114-uart", "nvidia,tegra20-uart";
                reg = <0x70006300 0x100>;
                reg-shift = <2>;
                interrupts = <0 90 0x04>;
+               nvidia,dma-request-selector = <&apbdma 19>;
                status = "disabled";
        };