Hello Greg,
On 07/11/2017 07:22 AM, Greg Ungerer wrote:
> Document the "<0>" notation for specifying use of a native chip-select
> in the "cs-gpios" tag of an SPI device in devicetree. This isn't unique
> to the spi-imx driver, but this clearly spells out that you can use it
> with this driver.
>
> Signed-off-by: Greg Ungerer <gerg@xxxxxxxxxxxxxx>
> ---
> Documentation/devicetree/bindings/spi/fsl-imx-cspi.txt | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/devicetree/bindings/spi/fsl-imx-cspi.txt b/Documentation/devicetree/bindings/spi/fsl-imx-cspi.txt
> index 31b5b21..cf616ea 100644
> --- a/Documentation/devicetree/bindings/spi/fsl-imx-cspi.txt
> +++ b/Documentation/devicetree/bindings/spi/fsl-imx-cspi.txt
> @@ -12,6 +12,7 @@ Required properties:
> - reg : Offset and length of the register set for the device
> - interrupts : Should contain CSPI/eCSPI interrupt
> - cs-gpios : Specifies the gpio pins to be used for chipselects.
> + Specify use of native chipselects with "<0>" in place of a gpio.
> - clocks : Clock specifiers for both ipg and per clocks.
> - clock-names : Clock names should include both "ipg" and "per"
> See the clock consumer binding,
> @@ -38,7 +39,8 @@ ecspi@70010000 {
> reg = <0x70010000 0x4000>;
> interrupts = <36>;
> cs-gpios = <&gpio3 24 0>, /* GPIO3_24 */
> - <&gpio3 25 0>; /* GPIO3_25 */
> + <&gpio3 25 0>, /* GPIO3_25 */
> + <0>; /* Native chip select */
> dmas = <&sdma 3 7 1>, <&sdma 4 7 2>;
> dma-names = "rx", "tx";
> fsl,spi-rdy-drctl = <1>;
>
Adding Rob to Cc.
Reviewed-by: Vladimir Zapolskiy <vz@xxxxxxxxx>
Rob, if you find the change acceptable, can you ack it?
--
With best wishes,
Vladimir
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