On Tue, 22 Nov 2016, Benjamin Gaignard wrote:
> Add bindings information for stm32 timer MFD
>
> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@xxxxxx>
> ---
> .../devicetree/bindings/mfd/stm32-timer.txt | 53 ++++++++++++++++++++++
> 1 file changed, 53 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/mfd/stm32-timer.txt
>
> diff --git a/Documentation/devicetree/bindings/mfd/stm32-timer.txt b/Documentation/devicetree/bindings/mfd/stm32-timer.txt
> new file mode 100644
> index 0000000..3cefce1
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mfd/stm32-timer.txt
> @@ -0,0 +1,53 @@
> +STM32 multifunctions timer driver
"STM32 Multi-Function Timer/PWM device bindings"
Doesn't this shared device have a better name?
> +stm32 timer MFD allow to handle at the same time pwm and IIO timer devices
No need for this sentence.
> +Required parameters:
> +- compatible: must be one of the follow value:
> + "st,stm32-mfd-timer1"
> + "st,stm32-mfd-timer2"
> + "st,stm32-mfd-timer3"
> + "st,stm32-mfd-timer4"
> + "st,stm32-mfd-timer5"
> + "st,stm32-mfd-timer6"
> + "st,stm32-mfd-timer7"
> + "st,stm32-mfd-timer8"
> + "st,stm32-mfd-timer9"
> + "st,stm32-mfd-timer10"
> + "st,stm32-mfd-timer11"
> + "st,stm32-mfd-timer12"
> + "st,stm32-mfd-timer13"
> + "st,stm32-mfd-timer14"
We don't normally number devices.
What's stopping you from simply doing:
pwm1: pwm1@40010000 {
compatible = "st,stm32-pwm";
};
pwm2: pwm1@40020000 {
compatible = "st,stm32-pwm";
};
pwm3: pwm1@40030000 {
compatible = "st,stm32-pwm";
};
> +- reg : Physical base address and length of the controller's
> + registers.
> +- clock-names: Set to "mfd_timer_clk".
How many clocks are there?
If only 1, you don't need this property.
"mfd_timer_clk" is not the correct name.
What is it called in the datasheet?
> +- clocks: Phandle of the clock used by the timer module.
"Phandle to the clock ..."
> + For Clk properties, please refer to [1].
> +- interrupts : Reference to the timer interrupt
Reference to?
See how other binding documents describe this property.
> +Optional parameters:
> +- resets : Reference to a reset controller asserting the timer
As above.
> +Optional subnodes:
Either use ":" or " :" or "<tab>:", but keep it consistent.
> +- pwm: See Documentation/devicetree/bindings/pwm/pwm-stm32.txt
> +- iiotimer: See Documentation/devicetree/bindings/iio/timer/stm32-iio-timer.txt
> +
> +[1] Documentation/devicetree/bindings/clock/clock-bindings.txt
Use the relative paths "../clock/", "../pwm/", "../iio/".
> +Example:
> + mfd_timer1: mfdtimer1@40010000 {
This is not an "MFD timer". MFD is a Linuxisum.
> + compatible = "st,stm32-mfd-timer1";
Better description required.
> + reg = <0x40010000 0x400>;
> + clocks = <&rcc 0 160>;
> + clock-names = "mfd_timer_clk";
> + interrupts = <27>;
> +
> + pwm1: pwm1@40010000 {
> + compatible = "st,stm32-pwm1";
> + };
> +
> + iiotimer1: iiotimer1@40010000 {
> + compatible = "st,stm32-iio-timer1";
> + };
> + };
--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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