diff options
| author | Alper Nebi Yasak | 2020-10-22 23:49:26 +0300 |
|---|---|---|
| committer | Anatolij Gustschin | 2021-04-10 16:07:12 +0200 |
| commit | fefa713b1843cf13d3132bfe0cf27710938c5d92 (patch) | |
| tree | 4ae09212a60da99436d30eb24b3f9d041553cdbe /test/dm | |
| parent | 9749d2ea29e1a535c9ea8f850db8b6abe6df7b15 (diff) | |
video: backlight: Support PWMs without a known period_ns
The PWM device provided by Chrome OS EC doesn't really support anything
other than setting a relative duty cycle. To support it as a backlight,
this patch makes the PWM period optional in the device tree and pretends
the valid brightness range is its period_ns.
Also adds a sandbox test for a PWM channel that has a fixed period,
checking that the resulting duty_cycle matches on a set_config() even if
the requested period_ns can't be set.
Signed-off-by: Alper Nebi Yasak <alpernebiyasak@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'test/dm')
| -rw-r--r-- | test/dm/pwm.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/test/dm/pwm.c b/test/dm/pwm.c index 0de6dba1ba6..b624cf3d655 100644 --- a/test/dm/pwm.c +++ b/test/dm/pwm.c @@ -6,6 +6,7 @@ #include <common.h> #include <dm.h> #include <pwm.h> +#include <asm/test.h> #include <dm/test.h> #include <test/test.h> #include <test/ut.h> @@ -14,6 +15,10 @@ static int dm_test_pwm_base(struct unit_test_state *uts) { struct udevice *dev; + uint period_ns; + uint duty_ns; + bool enable; + bool polarity; ut_assertok(uclass_get_device(UCLASS_PWM, 0, &dev)); ut_assertnonnull(dev); @@ -24,6 +29,12 @@ static int dm_test_pwm_base(struct unit_test_state *uts) ut_asserteq(-ENOSPC, pwm_set_enable(dev, 3, true)); ut_assertok(pwm_set_invert(dev, 0, true)); + ut_assertok(pwm_set_config(dev, 2, 100, 50)); + ut_assertok(sandbox_pwm_get_config(dev, 2, &period_ns, &duty_ns, + &enable, &polarity)); + ut_asserteq(period_ns, 4096); + ut_asserteq(duty_ns, 50 * 4096 / 100); + ut_assertok(uclass_get_device(UCLASS_PWM, 1, &dev)); ut_asserteq(-ENODEV, uclass_get_device(UCLASS_PWM, 2, &dev)); |