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

On 25.07.2012 14:32, Wolfram Sang wrote:

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+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?

I'd prefer to drop it unless there is a real need for it. CCing Shawn to
ask why "fsl,spi-num-chipselects" was added to the spi-imx driver
instead of using of_gpio_{named_}count(). Was there a reason?

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+
+		/* 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?

Many, yes; enough, don't know :) I just experienced that people
missed this information in some of the i2c host controller binding
descriptions, despite it was available elsewhere.

I would rather say specific examples in the documenation for generic bus
drivers cause more confusion than they clear :)


Daniel


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