linux-kernel - [PATCH 2/3] i2c: at91: add DT property "atmel,twd-hold-cycles" to binding

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Message-ID: <1448372862-11912-2-git-send-email-ludovic.desroches@atmel.com>
Date:	Tue, 24 Nov 2015 14:47:41 +0100
From:	Ludovic Desroches <ludovic.desroches@...el.com>
To:	<wsa@...-dreams.de>, <nicolas.ferre@...el.com>,
	<alexandre.belloni@...e-electrons.com>, <plagnioj@...osoft.com>
CC:	<linux-i2c@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <cyrille.pichen@...el.com>,
	Wenyou Yang <wenyou.yang@...el.com>,
	Ludovic Desroches <ludovic.desroches@...el.com>
Subject: [PATCH 2/3] i2c: at91: add DT property "atmel,twd-hold-cycles" to binding

From: Wenyou Yang <wenyou.yang@...el.com>

Add a DT property "atmel,twd-hold-cycles" to specify the HOLD
filed of TWIHS_CWGR register to increase the TWD hold time.

Signed-off-by: Wenyou Yang <wenyou.yang@...el.com>
Signed-off-by: Ludovic Desroches <ludovic.desroches@...el.com>
---
 Documentation/devicetree/bindings/i2c/i2c-at91.txt | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Documentation/devicetree/bindings/i2c/i2c-at91.txt b/Documentation/devicetree/bindings/i2c/i2c-at91.txt
index 6e81dc1..c81a0cb 100644
--- a/Documentation/devicetree/bindings/i2c/i2c-at91.txt
+++ b/Documentation/devicetree/bindings/i2c/i2c-at91.txt
@@ -17,6 +17,9 @@ Optional properties:
 - dma-names: should contain "tx" and "rx".
 - atmel,fifo-size: maximum number of data the RX and TX FIFOs can store for FIFO
   capable I2C controllers.
+- atmel,twd-hold-cycles: number of cycles for TWD hold time whose value is
+  determinated by (atmel,twd-hold-cycles + 3) x t_peripheral_clock,
+  maximum value is 0x1f.
 - Child nodes conforming to i2c bus binding
 
 Examples :
@@ -29,6 +32,7 @@ i2c0: i2c@...84000 {
 	#size-cells = <0>;
 	clocks = <&twi0_clk>;
 	clock-frequency = <400000>;
+	atmel,twd-hold-cycles = <2>;
 
 	24c512@50 {
 		compatible = "24c512";
-- 
2.5.0

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