[PATCH v8 11/11] pwm: Add Raspberry Pi Firmware based PWM bus

[Thierry Reding]

On Fri, Mar 12, 2021 at 01:24:54PM +0100, Nicolas Saenz Julienne wrote:
> Adds support to control the PWM bus available in official Raspberry Pi
> PoE HAT. Only RPi's co-processor has access to it, so commands have to
> be sent through RPi's firmware mailbox interface.
> 
> Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne at suse.de>
> 
> ---
> 
> Changes since v7:
>  - Remove unwarranted RPI_PWM_DEF_DUTY_REG usage
> 
>  Changes since v6:
> - Use %pe
> - Round divisions properly
> - Use dev_err_probe()
> - Pass check_patch
> 
> Changes since v3:
>  - Rename compatible string to be more explicit WRT to bus's limitations
> 
> Changes since v2:
>  - Use devm_rpi_firmware_get()
>  - Rename driver
>  - Small cleanups
> 
> Changes since v1:
>  - Use default pwm bindings and get rid of xlate() function
>  - Correct spelling errors
>  - Correct apply() function
>  - Round values
>  - Fix divisions in arm32 mode
>  - Small cleanups
> 
>  drivers/pwm/Kconfig               |   9 ++
>  drivers/pwm/Makefile              |   1 +
>  drivers/pwm/pwm-raspberrypi-poe.c | 206 ++++++++++++++++++++++++++++++
>  3 files changed, 216 insertions(+)
>  create mode 100644 drivers/pwm/pwm-raspberrypi-poe.c

Acked-by: Thierry Reding <thierry.reding at gmail.com>
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