[PATCH 06/14] drivers: reset: Add STM32 reset driver

[afaerber@suse.de (Andreas Färber)]

Am 12.02.2015 um 18:45 schrieb Maxime Coquelin:
> The STM32 MCUs family IP can be reset by accessing some shared registers.
> 
> The specificity is that some reset lines are used by the timers.
> At timer initialization time, the timer has to be reset, that's why
> we cannot use a regular driver.
> 
> Signed-off-by: Maxime Coquelin <mcoquelin.stm32@gmail.com>
> ---
>  .../devicetree/bindings/reset/st,stm32-reset.txt   |  19 ++++
>  drivers/reset/Makefile                             |   1 +
>  drivers/reset/reset-stm32.c                        | 124 +++++++++++++++++++++
>  3 files changed, 144 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/reset/st,stm32-reset.txt
>  create mode 100644 drivers/reset/reset-stm32.c
> 
> diff --git a/Documentation/devicetree/bindings/reset/st,stm32-reset.txt b/Documentation/devicetree/bindings/reset/st,stm32-reset.txt
> new file mode 100644
> index 0000000..add1298
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/reset/st,stm32-reset.txt
> @@ -0,0 +1,19 @@
> +STMicroelectronics STM32 Peripheral Reset Controller
> +====================================================
> +
> +Please also refer to reset.txt in this directory for common reset
> +controller binding usage.
> +
> +Required properties:
> +- compatible: Should be "st,stm32-reset"
> +- reg: should be register base and length as documented in the
> +  datasheet
> +- #reset-cells: 1, see below
> +
> +example:
> +
> +reset_ahb1: reset at 40023810 {
> +	#reset-cells = <1>;
> +	compatible = "st,stm32-reset";
> +	reg = <0x40023810 0x4>;
> +};
[snip]

RM0090 has two different chapters on the RCC IP:
* Reset and clock control for STM32F42xxx and STM32F43xxx (RCC)
* Reset and clock control for STM32F405xx/07xx and STM32F415xx/17xx(RCC)

I therefore feel it is wrong to use "stm32-" here; instead I used
"st,stm32f429-rcc" (also relates to 12/14 discussion). This may apply to
other identifiers, too.

Regards,
Andreas

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