On 10/11/2011 10:19 AM, Thomas Abraham wrote: > Hi Rob, > > On 11 October 2011 20:41, Rob Herring <robherring2@xxxxxxxxx> wrote: >> Thomas, >> >> On 10/11/2011 03:16 AM, Thomas Abraham wrote: >>> As gpio chips get registered, a device tree node which represents the >>> gpio chip is searched and attached to it. A translate function is also >>> provided to convert the gpio specifier into actual platform settings >>> for pin function selection, pull up/down and driver strength settings. >>> >>> Signed-off-by: Thomas Abraham <thomas.abraham@xxxxxxxxxx> >>> --- >>> This patch is based on the latest consolidated Samsung GPIO driver available >>> in the following tree: >>> https://github.com/kgene/linux-samsung.git branch: for-next >>> >>> .../devicetree/bindings/gpio/gpio-samsung.txt | 30 +++++++++++ >>> drivers/gpio/gpio-samsung.c | 53 ++++++++++++++++++++ >>> 2 files changed, 83 insertions(+), 0 deletions(-) >>> create mode 100644 Documentation/devicetree/bindings/gpio/gpio-samsung.txt >>> >>> diff --git a/Documentation/devicetree/bindings/gpio/gpio-samsung.txt b/Documentation/devicetree/bindings/gpio/gpio-samsung.txt >>> new file mode 100644 >>> index 0000000..883faeb >>> --- /dev/null >>> +++ b/Documentation/devicetree/bindings/gpio/gpio-samsung.txt >>> @@ -0,0 +1,30 @@ >>> +Samsung Exynos4 GPIO Controller >>> + >>> +Required properties: >>> +- compatible: Format of compatible property value should be >>> + "samsung,exynos4-gpio-<controller_name>". Example: For GPA0 controller, the >>> + compatible property value should be "samsung,exynos4-gpio-gpa0". >> >> Isn't gpa0 an instance of the h/w, not a version? > > GPA0 is a instance of the gpio controller. There are several such > instances and there could be differences in those instances such as > the number of GPIO lines managed by that gpio controller instance. > That doesn't seem like a reason to have different compatible strings. Does that affect the programming model of the controller? Unused lines whether at the board level or SOC level shouldn't really matter. Rob -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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