Re: [PATCH 2/2] SPI: spi-gpio: Add DT bindings

On 25.07.2012 14:11, Wolfram Sang wrote:

On Wed, Jul 25, 2012 at 01:44:12PM +0200, Daniel Mack wrote:

quoted

This patch adds DT bindings to the spi-gpio driver and some
documentation about how to use it.

Signed-off-by: Daniel Mack <redacted>
---
 Documentation/devicetree/bindings/spi/spi-gpio.txt |   29 ++++++
 drivers/spi/spi-gpio.c                             |   99 +++++++++++++++++++-
 2 files changed, 125 insertions(+), 3 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/spi/spi-gpio.txt

diff --git a/Documentation/devicetree/bindings/spi/spi-gpio.txt b/Documentation/devicetree/bindings/spi/spi-gpio.txt
new file mode 100644
index 0000000..8a824be
--- /dev/null
+++ b/Documentation/devicetree/bindings/spi/spi-gpio.txt

@@ -0,0 +1,29 @@
+SPI-GPIO devicetree bindings
+
+Required properties:
+
+ - compatible: should be set to "spi-gpio"
+ - #address-cells: should be set to <0x1>
+ - ranges
+ - gpio-sck: GPIO spec for the SCK line to use
+ - gpio-miso: GPIO spec for the MISO line to use
+ - gpio-mosi: GPIO spec for the MOSI line to use
+ - cs-gpios: GPIOs to use for chipselect lines
+ - num-chipselects: number of chipselect lines
+
+Example:
+
+	spi {
+		compatible = "spi-gpio";
+		#address-cells = <0x1>;
+		ranges;
+
+		gpio-sck = <&gpio 95 0>;
+		gpio-miso = <&gpio 98 0>;
+		gpio-mosi = <&gpio 97 0>;
+		cs-gpios = <&gpio 125 0>;
+		num-chipselects = <1>;

Can't we use of_gpio_named_count() instead of this property?

I thought so too, but it's probably also a good idea to keep this driver
in line to what other drivers do, no? Anyway, I can of course change it
if desired.

quoted

+
+		/* clients */

Minor: A simple example is helpful for people new to devicetree as I
experienced in the last days.

Hmm, aren't there enough examples in a) the full dts files in the kernel
and b) in the documenation of spi clients?


Thanks,
Daniel


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