Implement the ->init_state() function to expose initial state.
Signed-off-by: Boris Brezillon <boris.brezil...@free-electrons.com>
---
drivers/pwm/pwm-rockchip.c | 47 ++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 47 insertions(+)
diff --git a/drivers/pwm/pwm-rockchip.c b/drivers/pwm/pwm-rockchip.c
index 7d9cc90..11e932d 100644
--- a/drivers/pwm/pwm-rockchip.c
+++ b/drivers/pwm/pwm-rockchip.c
@@ -51,6 +51,7 @@ struct rockchip_pwm_data {
void (*set_enable)(struct pwm_chip *chip,
struct pwm_device *pwm, bool enable);
+ void (*init)(struct pwm_chip *chip, struct pwm_device *pwm);
};
static inline struct rockchip_pwm_chip *to_rockchip_pwm_chip(struct pwm_chip
*c)
@@ -75,6 +76,17 @@ static void rockchip_pwm_set_enable_v1(struct pwm_chip *chip,
writel_relaxed(val, pc->base + pc->data->regs.ctrl);
}
+static void rockchip_pwm_init_v1(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+ struct rockchip_pwm_chip *pc = to_rockchip_pwm_chip(chip);
+ u32 enable_conf = PWM_CTRL_OUTPUT_EN | PWM_CTRL_TIMER_EN;
+ u32 val;
+
+ val = readl(pc->base + pc->data->regs.ctrl);
+ if ((val & enable_conf) == enable_conf)
+ pwm->state.enabled = true;
+}
+
static void rockchip_pwm_set_enable_v2(struct pwm_chip *chip,
struct pwm_device *pwm, bool enable)
{
@@ -98,6 +110,36 @@ static void rockchip_pwm_set_enable_v2(struct pwm_chip
*chip,
writel_relaxed(val, pc->base + pc->data->regs.ctrl);
}
+static void rockchip_pwm_init_state(struct pwm_chip *chip,
+ struct pwm_device *pwm)
+{
+ struct rockchip_pwm_chip *pc = to_rockchip_pwm_chip(chip);
+ unsigned long clk_rate;
+ u64 tmp;
+ int ret;
+
+ ret = clk_enable(pc->clk);
+ if (ret)
+ return;
+
+ clk_rate = clk_get_rate(pc->clk);
+
+ tmp = readl(pc->base + pc->data->regs.period);
+ tmp *= pc->data->prescaler * NSEC_PER_SEC;
+ tmp = do_div(tmp, clk_rate);
+ pwm->state.period = tmp;
+
+ tmp = readl(pc->base + pc->data->regs.duty);
+ tmp *= pc->data->prescaler * NSEC_PER_SEC;
+ tmp = do_div(tmp, clk_rate);
+ pwm->state.duty_cycle = tmp;
+
+ pc->data->init(chip, chip->pwms);
+
+ if (!pwm_is_enabled(pwm))
+ clk_disable(pc->clk);
+}
+
static int rockchip_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
int duty_ns, int period_ns)
{
@@ -171,6 +213,7 @@ static void rockchip_pwm_disable(struct pwm_chip *chip,
struct pwm_device *pwm)
}
static const struct pwm_ops rockchip_pwm_ops_v1 = {
+ .init_state = rockchip_pwm_init_state,
.config = rockchip_pwm_config,
.enable = rockchip_pwm_enable,
.disable = rockchip_pwm_disable,
@@ -178,6 +221,7 @@ static const struct pwm_ops rockchip_pwm_ops_v1 = {
};
static const struct pwm_ops rockchip_pwm_ops_v2 = {
+ .init_state = rockchip_pwm_init_state,
.config = rockchip_pwm_config,
.set_polarity = rockchip_pwm_set_polarity,
.enable = rockchip_pwm_enable,
@@ -195,6 +239,7 @@ static const struct rockchip_pwm_data pwm_data_v1 = {
.prescaler = 2,
.ops = &rockchip_pwm_ops_v1,
.set_enable = rockchip_pwm_set_enable_v1,
+ .init = rockchip_pwm_init_v1,
};
static const struct rockchip_pwm_data pwm_data_v2 = {
@@ -207,6 +252,7 @@ static const struct rockchip_pwm_data pwm_data_v2 = {
.prescaler = 1,
.ops = &rockchip_pwm_ops_v2,
.set_enable = rockchip_pwm_set_enable_v2,
+ .init = rockchip_pwm_init_v2,
};
static const struct rockchip_pwm_data pwm_data_vop = {
@@ -219,6 +265,7 @@ static const struct rockchip_pwm_data pwm_data_vop = {
.prescaler = 1,
.ops = &rockchip_pwm_ops_v2,
.set_enable = rockchip_pwm_set_enable_v2,
+ .init = rockchip_pwm_init_v2,
};
static const struct of_device_id rockchip_pwm_dt_ids[] = {
--
1.9.1
--
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