[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
State Changes Requested
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Commit Message

ludovic.desroches@atmel.com Nov. 24, 2015, 1:47 p.m. UTC
From: Wenyou Yang <wenyou.yang@atmel.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@atmel.com>
Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
---
 Documentation/devicetree/bindings/i2c/i2c-at91.txt | 4 ++++
 1 file changed, 4 insertions(+)

Comments

Rob Herring Nov. 25, 2015, 10:46 p.m. UTC | #1
On Tue, Nov 24, 2015 at 02:47:41PM +0100, Ludovic Desroches wrote:
> From: Wenyou Yang <wenyou.yang@atmel.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@atmel.com>
> Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>

Acked-by: Rob Herring <robh@kernel.org>

> ---
>  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@fff84000 {
>  	#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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Patch
diff mbox

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@fff84000 {
 	#size-cells = <0>;
 	clocks = <&twi0_clk>;
 	clock-frequency = <400000>;
+	atmel,twd-hold-cycles = <2>;
 
 	24c512@50 {
 		compatible = "24c512";