linux-kernel - [PATCH] Documentation: DT: omap_serial: document missing properties and add an example

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Message-Id: <1424965125-31714-1-git-send-email-mporter@konsulko.com>
Date:	Thu, 26 Feb 2015 10:38:45 -0500
From:	Matt Porter <mporter@...sulko.com>
To:	Devicetree List <devicetree@...r.kernel.org>
Cc:	Benoît Cousson <bcousson@...libre.com>,
	Linux OMAP List <linux-omap@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH] Documentation: DT: omap_serial: document missing properties and add an example

The omap_serial.txt binding documentation lacks a number of properties
that are used in DTS files for platforms incorporating this peripheral.
Fix this by documenting the missing required and optional fields and
add an example.

Signed-off-by: Matt Porter <mporter@...sulko.com>
---
 .../devicetree/bindings/serial/omap_serial.txt       | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/Documentation/devicetree/bindings/serial/omap_serial.txt b/Documentation/devicetree/bindings/serial/omap_serial.txt
index 342eedd..54c2a15 100644
--- a/Documentation/devicetree/bindings/serial/omap_serial.txt
+++ b/Documentation/devicetree/bindings/serial/omap_serial.txt
@@ -4,7 +4,27 @@ Required properties:
 - compatible : should be "ti,omap2-uart" for OMAP2 controllers
 - compatible : should be "ti,omap3-uart" for OMAP3 controllers
 - compatible : should be "ti,omap4-uart" for OMAP4 controllers
+- reg : address and length of the register space
+- interrupts or interrupts-extended : Should contain the uart interrupt
+                                      specifier or both the interrupt
+                                      controller phandle and interrupt
+                                      specifier.
 - ti,hwmods : Must be "uart<n>", n being the instance number (1-based)
 
 Optional properties:
 - clock-frequency : frequency of the clock input to the UART
+- dmas : DMA specifier, consisting of a phandle to the DMA controller
+         node and a DMA channel number.
+- dma-names : "rx" for receive channel, "tx" for transmit channel.
+
+Example:
+
+                uart4: serial@...42000 {
+                        compatible = "ti,omap3-uart";
+                        reg = <0x49042000 0x400>;
+                        interrupts = <80>;
+                        dmas = <&sdma 81 &sdma 82>;
+                        dma-names = "tx", "rx";
+                        ti,hwmods = "uart4";
+                        clock-frequency = <48000000>;
+                };
-- 
1.8.4

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