pwm: hibvt: Add hi3559v100 support

Add support for the hi3559v100-shub-pwm and hisilicon,hi3559v100-pwm
platforms. They require a special quirk: the PWM has to be enabled twice
to force a duty_cycle refresh.

Signed-off-by: Mathieu Othacehe <m.othacehe@gmail.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

1 files changed, 26 insertions, 1 deletions

diff --git a/drivers/pwm/pwm-hibvt.c b/drivers/pwm/pwm-hibvt.c
index ffc803818c3c..a0b09603d13d 100644
--- a/drivers/pwm/pwm-hibvt.c
+++ b/drivers/pwm/pwm-hibvt.c
@@ -54,6 +54,7 @@ struct hibvt_pwm_chip {
 
 struct hibvt_pwm_soc {
         u32 num_pwms;
+        bool quirk_force_enable;
 };
 
 static const struct hibvt_pwm_soc hi3516cv300_soc_info = {
@@ -64,6 +65,16 @@ static const struct hibvt_pwm_soc hi3519v100_soc_info = {
         .num_pwms = 8,
 };
 
+static const struct hibvt_pwm_soc hi3559v100_shub_soc_info = {
+        .num_pwms = 8,
+        .quirk_force_enable = true,
+};
+
+static const struct hibvt_pwm_soc hi3559v100_soc_info = {
+        .num_pwms = 2,
+        .quirk_force_enable = true,
+};
+
 static inline struct hibvt_pwm_chip *to_hibvt_pwm_chip(struct pwm_chip *chip)
 {
         return container_of(chip, struct hibvt_pwm_chip, chip);
@@ -152,13 +163,23 @@ static void hibvt_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm,
 static int hibvt_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
                                 struct pwm_state *state)
 {
+        struct hibvt_pwm_chip *hi_pwm_chip = to_hibvt_pwm_chip(chip);
+
         if (state->polarity != pwm->state.polarity)
                 hibvt_pwm_set_polarity(chip, pwm, state->polarity);
 
         if (state->period != pwm->state.period ||
-                state->duty_cycle != pwm->state.duty_cycle)
+            state->duty_cycle != pwm->state.duty_cycle) {
                 hibvt_pwm_config(chip, pwm, state->duty_cycle, state->period);
 
+                /*
+                 * Some implementations require the PWM to be enabled twice
+                 * each time the duty cycle is refreshed.
+                 */
+                if (hi_pwm_chip->soc->quirk_force_enable && state->enabled)
+                        hibvt_pwm_enable(chip, pwm);
+        }
+
         if (state->enabled != pwm->state.enabled) {
                 if (state->enabled)
                         hibvt_pwm_enable(chip, pwm);
@@ -259,6 +280,10 @@ static const struct of_device_id hibvt_pwm_of_match[] = {
           .data = &hi3516cv300_soc_info },
         { .compatible = "hisilicon,hi3519v100-pwm",
           .data = &hi3519v100_soc_info },
+        { .compatible = "hisilicon,hi3559v100-shub-pwm",
+          .data = &hi3559v100_shub_soc_info },
+        { .compatible = "hisilicon,hi3559v100-pwm",
+          .data = &hi3559v100_soc_info },
         {  }
 };
 MODULE_DEVICE_TABLE(of, hibvt_pwm_of_match);