summaryrefslogtreecommitdiff
path: root/drivers/video/backlight/lp855x_bl.c
diff options
context:
space:
mode:
authorArtur Weber <aweber.kernel@gmail.com>2023-05-19 20:07:26 +0200
committerLee Jones <lee@kernel.org>2023-06-08 16:49:11 +0100
commitc1ff7da03e164265cd19f95ac0926c22d28eec19 (patch)
tree94c853a75b5c29f6165d9a50203bcacd816519c0 /drivers/video/backlight/lp855x_bl.c
parent24b8ae3e2e2f675e78bdf97f24de285c4a38cbcb (diff)
video: backlight: lp855x: Get PWM for PWM mode during probe
Also deprecate the pwm-period DT property, as it is now redundant (pwms property already contains period value). Signed-off-by: Artur Weber <aweber.kernel@gmail.com> Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org> Signed-off-by: Lee Jones <lee@kernel.org> Link: https://lore.kernel.org/r/20230519180728.2281-3-aweber.kernel@gmail.com
Diffstat (limited to 'drivers/video/backlight/lp855x_bl.c')
-rw-r--r--drivers/video/backlight/lp855x_bl.c48
1 files changed, 26 insertions, 22 deletions
diff --git a/drivers/video/backlight/lp855x_bl.c b/drivers/video/backlight/lp855x_bl.c
index caac1cfacbe8..1c9e921bca14 100644
--- a/drivers/video/backlight/lp855x_bl.c
+++ b/drivers/video/backlight/lp855x_bl.c
@@ -218,23 +218,10 @@ err:
static void lp855x_pwm_ctrl(struct lp855x *lp, int br, int max_br)
{
- struct pwm_device *pwm;
struct pwm_state state;
- /* request pwm device with the consumer name */
- if (!lp->pwm) {
- pwm = devm_pwm_get(lp->dev, lp->chipname);
- if (IS_ERR(pwm))
- return;
-
- lp->pwm = pwm;
-
- pwm_init_state(lp->pwm, &state);
- } else {
- pwm_get_state(lp->pwm, &state);
- }
+ pwm_get_state(lp->pwm, &state);
- state.period = lp->pdata->period_ns;
state.duty_cycle = div_u64(br * state.period, max_br);
state.enabled = state.duty_cycle;
@@ -339,6 +326,7 @@ static int lp855x_parse_dt(struct lp855x *lp)
of_property_read_string(node, "bl-name", &pdata->name);
of_property_read_u8(node, "dev-ctrl", &pdata->device_control);
of_property_read_u8(node, "init-brt", &pdata->initial_brightness);
+ /* Deprecated, specify period in pwms property instead */
of_property_read_u32(node, "pwm-period", &pdata->period_ns);
/* Fill ROM platform data if defined */
@@ -399,6 +387,7 @@ static int lp855x_probe(struct i2c_client *cl)
const struct i2c_device_id *id = i2c_client_get_device_id(cl);
const struct acpi_device_id *acpi_id = NULL;
struct device *dev = &cl->dev;
+ struct pwm_state pwmstate;
struct lp855x *lp;
int ret;
@@ -457,11 +446,6 @@ static int lp855x_probe(struct i2c_client *cl)
}
}
- if (lp->pdata->period_ns > 0)
- lp->mode = PWM_BASED;
- else
- lp->mode = REGISTER_BASED;
-
lp->supply = devm_regulator_get(dev, "power");
if (IS_ERR(lp->supply)) {
if (PTR_ERR(lp->supply) == -EPROBE_DEFER)
@@ -472,11 +456,31 @@ static int lp855x_probe(struct i2c_client *cl)
lp->enable = devm_regulator_get_optional(dev, "enable");
if (IS_ERR(lp->enable)) {
ret = PTR_ERR(lp->enable);
- if (ret == -ENODEV) {
+ if (ret == -ENODEV)
lp->enable = NULL;
- } else {
+ else
return dev_err_probe(dev, ret, "getting enable regulator\n");
- }
+ }
+
+ lp->pwm = devm_pwm_get(lp->dev, lp->chipname);
+ if (IS_ERR(lp->pwm)) {
+ ret = PTR_ERR(lp->pwm);
+ if (ret == -ENODEV || ret == -EINVAL)
+ lp->pwm = NULL;
+ else
+ return dev_err_probe(dev, ret, "getting PWM\n");
+
+ lp->mode = REGISTER_BASED;
+ dev_dbg(dev, "mode: register based\n");
+ } else {
+ pwm_init_state(lp->pwm, &pwmstate);
+ /* Legacy platform data compatibility */
+ if (lp->pdata->period_ns > 0)
+ pwmstate.period = lp->pdata->period_ns;
+ pwm_apply_state(lp->pwm, &pwmstate);
+
+ lp->mode = PWM_BASED;
+ dev_dbg(dev, "mode: PWM based\n");
}
if (lp->supply) {