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pwm: ntxec: Add driver for PWM function in Netronix EC

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The Netronix EC provides a PWM output which is used for the backlight
on some ebook readers. This patches adds a driver for the PWM output.

The .get_state callback is not implemented, because the PWM state can't
be read back from the hardware.

Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Reviewed-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Thierry Reding <thierry.reding@gmail.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Jonathan Neuschäfer
2021-01-24 22:41:24 +01:00
committed by Lee Jones
parent eceae58393
commit 9fc0486f94
3 changed files with 193 additions and 0 deletions
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drivers/pwm/Kconfig
+8
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@@ -393,6 +393,14 @@ config PWM_MXS
To compile this driver as a module, choose M here: the module
will be called pwm-mxs.
config PWM_NTXEC
tristate "Netronix embedded controller PWM support"
depends on MFD_NTXEC
help
Say yes here if you want to support the PWM output of the embedded
controller found in certain e-book readers designed by the original
design manufacturer Netronix.
config PWM_OMAP_DMTIMER
tristate "OMAP Dual-Mode Timer PWM support"
depends on OF