linux-kernel - [PATCH V3 3/5] ARM: tegra:add aliases and DMA requestor for serial nodes of Tegra114

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Date:	Thu, 14 Mar 2013 01:19:52 +0530
From:	Laxman Dewangan <ldewangan@...dia.com>
To:	<swarren@...dotorg.org>
CC:	<linux-arm-kernel@...ts.infradead.org>,
	<linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	Laxman Dewangan <ldewangan@...dia.com>
Subject: [PATCH V3 3/5] ARM: tegra:add aliases and DMA requestor for serial nodes of Tegra114

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

The simple serial driver get enabled with compatible "nvidia,tegra114-uart",
"nvidia,tegra20-uart" and APB DMA based driver will get enabled with
compatible "nvidia,tegra114-hsuart", "nvidia,tegra30-hsuart".

Signed-off-by: Laxman Dewangan <ldewangan@...dia.com>
---
Changes from V1:
- Remove UARTB car id correction. Make the compatible with tegra114 and
  tegra30 for hsuart and tegra20 for simple uart driver.

Changes from V2:
- Rebase to for-3.10/dt of Stephen's tegra tree.

 arch/arm/boot/dts/tegra114.dtsi |   27 +++++++++++++++++++++++----
 1 files changed, 23 insertions(+), 4 deletions(-)

diff --git a/arch/arm/boot/dts/tegra114.dtsi b/arch/arm/boot/dts/tegra114.dtsi
index ce44938..5a41d04 100644
--- 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@...06000 {
+	/*
+	 * 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@...06000 {
 		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@...06040 {
+	uartb: serial@...06040 {
 		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@...06200 {
+	uartc: serial@...06200 {
 		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@...06300 {
+	uartd: serial@...06300 {
 		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";
 	};
 
-- 
1.7.1.1

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