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 <redacted>

---

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 <redacted>