On Tue, Dec 30, 2014 at 8:28 PM, Rob Herring <robherring2@xxxxxxxxx> wrote:
> From: Rob Herring <robh@xxxxxxxxxx>
>
> The Versatile boards have the same sysregs as other ARM Ltd boards. Add
> the nodes in preparation to enable support for 24MHz counter as
> sched_clock and MMC card detect and write protect support.
>
> Signed-off-by: Rob Herring <robh@xxxxxxxxxx>
> Cc: Russell King <linux@xxxxxxxxxxxxxxxx>
> Cc: Linus Walleij <linus.walleij@xxxxxxxxxx>
> ---
> arch/arm/boot/dts/versatile-ab.dts | 23 +++++++++++++++++++++++
> 1 file changed, 23 insertions(+)
>
> diff --git a/arch/arm/boot/dts/versatile-ab.dts b/arch/arm/boot/dts/versatile-ab.dts
> index 27d0d9c..62f04b0 100644
> --- a/arch/arm/boot/dts/versatile-ab.dts
> +++ b/arch/arm/boot/dts/versatile-ab.dts
> @@ -252,6 +252,29 @@
> #size-cells = <1>;
> ranges = <0 0x10000000 0x10000>;
>
> + sysreg@0 {
> + compatible = "arm,vexpress-sysreg";
vexpress? No...
compatible = "syscon";
> + reg = <0x00000 0x1000>;
> +
> + v2m_led_gpios: sys_led@08 {
> + compatible = "arm,vexpress-sysreg,sys_led";
> + gpio-controller;
> + #gpio-cells = <2>;
> + };
These are not GPIOs. These are LED registers really.
see how to use LEDs from drivers/leds/leds-syscon.c and bindings.
example in:
arch/arm/boot/dts/integrator.dtsi
Very straight-forward I think.
> +
> + v2m_mmc_gpios: sys_mci@48 {
> + compatible = "arm,vexpress-sysreg,sys_mci";
> + gpio-controller;
> + #gpio-cells = <2>;
> + };
> +
> + v2m_flash_gpios: sys_flash@4c {
> + compatible = "arm,vexpress-sysreg,sys_flash";
> + gpio-controller;
> + #gpio-cells = <2>;
> + };
I don't have drivers for these "gpio controllers" and I don't think they are
GPIOs either, since they are not general purpose at all.
For the latter I have some code boiling for the Integrators:
https://git.kernel.org/cgit/linux/kernel/git/linusw/linux-integrator.git/commit/?h=multiplatform&id=9c28e114ec957fadf1dade382d8e8b8aa43c8426
https://git.kernel.org/cgit/linux/kernel/git/linusw/linux-integrator.git/commit/?h=multiplatform&id=a3d4512abb85de290cdca0586bcff9147833917f
Yours,
Linus Walleij
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