[PATCH v4] backlight: lp855x: Switch to atomic PWM API

[Maíra Canal]

Remove legacy PWM interface (pwm_config, pwm_enable, pwm_disable) and
replace it for the atomic PWM API.

Signed-off-by: Maíra Canal <maira.ca...@usp.br>
---
V1 -> V2: Initialize variable and simply conditional loop
V2 -> V3: Fix assignment of NULL variable
V3 -> V4: Replace division for pwm_set_relative_duty_cycle
---
 drivers/video/backlight/lp855x_bl.c | 20 ++++++++------------
 1 file changed, 8 insertions(+), 12 deletions(-)

diff --git a/drivers/video/backlight/lp855x_bl.c 
b/drivers/video/backlight/lp855x_bl.c
index e94932c69f54..bbf24564082a 100644
--- a/drivers/video/backlight/lp855x_bl.c
+++ b/drivers/video/backlight/lp855x_bl.c
@@ -233,9 +233,8 @@ static int lp855x_configure(struct lp855x *lp)
 
 static void lp855x_pwm_ctrl(struct lp855x *lp, int br, int max_br)
 {
-       unsigned int period = lp->pdata->period_ns;
-       unsigned int duty = br * period / max_br;
        struct pwm_device *pwm;
+       struct pwm_state state;
 
        /* request pwm device with the consumer name */
        if (!lp->pwm) {
@@ -245,18 +244,15 @@ static void lp855x_pwm_ctrl(struct lp855x *lp, int br, 
int max_br)
 
                lp->pwm = pwm;
 
-               /*
-                * FIXME: pwm_apply_args() should be removed when switching to
-                * the atomic PWM API.
-                */
-               pwm_apply_args(pwm);
+               pwm_init_state(lp->pwm, &state);
+               state.period = lp->pdata->period_ns;
        }
 
-       pwm_config(lp->pwm, duty, period);
-       if (duty)
-               pwm_enable(lp->pwm);
-       else
-               pwm_disable(lp->pwm);
+       pwm_get_state(lp->pwm, &state);
+       pwm_set_relative_duty_cycle(&state, br, max_br);
+       state.enabled = state.duty_cycle;
+
+       pwm_apply_state(lp->pwm, &state);
 }
 
 static int lp855x_bl_update_status(struct backlight_device *bl)
-- 
2.31.1