Implement the ->get_state() function to expose initial state.
Signed-off-by: Boris Brezillon boris.brezillon@free-electrons.com --- drivers/pwm/pwm-rockchip.c | 69 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 69 insertions(+)
diff --git a/drivers/pwm/pwm-rockchip.c b/drivers/pwm/pwm-rockchip.c index 7d9cc90..6a1087c 100644 --- a/drivers/pwm/pwm-rockchip.c +++ b/drivers/pwm/pwm-rockchip.c @@ -51,6 +51,8 @@ struct rockchip_pwm_data {
void (*set_enable)(struct pwm_chip *chip, struct pwm_device *pwm, bool enable); + void (*get_state)(struct pwm_chip *chip, struct pwm_device *pwm, + struct pwm_state *pstate); };
static inline struct rockchip_pwm_chip *to_rockchip_pwm_chip(struct pwm_chip *c) @@ -75,6 +77,19 @@ static void rockchip_pwm_set_enable_v1(struct pwm_chip *chip, writel_relaxed(val, pc->base + pc->data->regs.ctrl); }
+static void rockchip_pwm_get_state_v1(struct pwm_chip *chip, + struct pwm_device *pwm, + struct pwm_state *pstate) +{ + 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) + pstate->enabled = true; +} + static void rockchip_pwm_set_enable_v2(struct pwm_chip *chip, struct pwm_device *pwm, bool enable) { @@ -98,6 +113,55 @@ static void rockchip_pwm_set_enable_v2(struct pwm_chip *chip, writel_relaxed(val, pc->base + pc->data->regs.ctrl); }
+static void rockchip_pwm_get_state_v2(struct pwm_chip *chip, + struct pwm_device *pwm, + struct pwm_state *pstate) +{ + struct rockchip_pwm_chip *pc = to_rockchip_pwm_chip(chip); + u32 enable_conf = PWM_OUTPUT_LEFT | PWM_LP_DISABLE | PWM_ENABLE | + PWM_CONTINUOUS; + u32 val; + + val = readl(pc->base + pc->data->regs.ctrl); + if ((val & enable_conf) != enable_conf) + return; + + pstate->enabled = true; + + if (!(val & PWM_DUTY_POSITIVE)) + pstate->polarity = PWM_POLARITY_INVERSED; +} + +static void rockchip_pwm_get_state(struct pwm_chip *chip, + struct pwm_device *pwm, + struct pwm_state *pstate) +{ + 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; + do_div(tmp, clk_rate); + pstate->period = tmp; + + tmp = readl(pc->base + pc->data->regs.duty); + tmp *= pc->data->prescaler * NSEC_PER_SEC; + do_div(tmp, clk_rate); + pstate->duty_cycle = tmp; + + pc->data->get_state(chip, pwm, pstate); + + 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 +235,7 @@ static void rockchip_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm) }
static const struct pwm_ops rockchip_pwm_ops_v1 = { + .get_state = rockchip_pwm_get_state, .config = rockchip_pwm_config, .enable = rockchip_pwm_enable, .disable = rockchip_pwm_disable, @@ -178,6 +243,7 @@ static const struct pwm_ops rockchip_pwm_ops_v1 = { };
static const struct pwm_ops rockchip_pwm_ops_v2 = { + .get_state = rockchip_pwm_get_state, .config = rockchip_pwm_config, .set_polarity = rockchip_pwm_set_polarity, .enable = rockchip_pwm_enable, @@ -195,6 +261,7 @@ static const struct rockchip_pwm_data pwm_data_v1 = { .prescaler = 2, .ops = &rockchip_pwm_ops_v1, .set_enable = rockchip_pwm_set_enable_v1, + .get_state = rockchip_pwm_get_state_v1, };
static const struct rockchip_pwm_data pwm_data_v2 = { @@ -207,6 +274,7 @@ static const struct rockchip_pwm_data pwm_data_v2 = { .prescaler = 1, .ops = &rockchip_pwm_ops_v2, .set_enable = rockchip_pwm_set_enable_v2, + .get_state = rockchip_pwm_get_state_v2, };
static const struct rockchip_pwm_data pwm_data_vop = { @@ -219,6 +287,7 @@ static const struct rockchip_pwm_data pwm_data_vop = { .prescaler = 1, .ops = &rockchip_pwm_ops_v2, .set_enable = rockchip_pwm_set_enable_v2, + .get_state = rockchip_pwm_get_state_v2, };
static const struct of_device_id rockchip_pwm_dt_ids[] = {