[U-Boot] [PATCH v4 03/16] tegra: fdt: Add pwm binding and node

[Thierry Reding]

On Thu, Sep 27, 2012 at 05:44:24PM -0700, Simon Glass wrote:
> This binding will apparently soon be in linux-next. Bring it in now
> since we need to do something, and may as well try to target what
> Linux will have.
> 
> Signed-off-by: Simon Glass <sjg at chromium.org>
> ---
> Changes in v3:
> - Add new commit for pwm binding and node
> 
>  arch/arm/dts/tegra20.dtsi                    |    7 +++++++
>  doc/device-tree-bindings/pwm/tegra20-pwm.txt |   18 ++++++++++++++++++
>  2 files changed, 25 insertions(+), 0 deletions(-)
>  create mode 100644 doc/device-tree-bindings/pwm/tegra20-pwm.txt
> 
> diff --git a/arch/arm/dts/tegra20.dtsi b/arch/arm/dts/tegra20.dtsi
> index d936b1e..3221bc9 100644
> --- a/arch/arm/dts/tegra20.dtsi
> +++ b/arch/arm/dts/tegra20.dtsi
> @@ -211,4 +211,11 @@
>  		compatible = "nvidia,tegra20-nand";
>  		reg = <0x70008000 0x100>;
>  	};
> +
> +	pwm: pwm at 7000a000 {
> +		compatible = "nvidia,tegra20-pwm";
> +		reg = <0x7000a000 0x100>;
> +		#pwm-cells = <2>;
> +	};
> +
>  };
> diff --git a/doc/device-tree-bindings/pwm/tegra20-pwm.txt b/doc/device-tree-bindings/pwm/tegra20-pwm.txt
> new file mode 100644
> index 0000000..bbbeedb
> --- /dev/null
> +++ b/doc/device-tree-bindings/pwm/tegra20-pwm.txt
> @@ -0,0 +1,18 @@
> +Tegra SoC PWFM controller
> +
> +Required properties:
> +- compatible: should be one of:
> +  - "nvidia,tegra20-pwm"
> +  - "nvidia,tegra30-pwm"
> +- reg: physical base address and length of the controller's registers
> +- #pwm-cells: On Tegra the number of cells used to specify a PWM is 2. The
> +  first cell specifies the per-chip index of the PWM to use and the second
> +  cell is the duty cycle in nanoseconds.

This is a mistake in the Linux kernel documentation. The second cell
specifies the period in nanoseconds, not the duty cycle. I'll fix this
up in the kernel.

Thierry
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