clk: pwm: implement the .get_duty_cycle callback

Commit 9fba738a53dda2 ("clk: add duty cycle support") added support for
getting and setting the duty cycle of a clock. This implements the
get_duty_cycle callback for PWM based clocks so the duty cycle is shown
in the debugfs output (/sys/kernel/debug/clk/clk_summary).

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

1 files changed, 14 insertions, 0 deletions

diff --git a/drivers/clk/clk-pwm.c b/drivers/clk/clk-pwm.c
index 02b472a1f9b0..c0cd6a0ff7f8 100644
--- a/drivers/clk/clk-pwm.c
+++ b/drivers/clk/clk-pwm.c
@@ -47,10 +47,24 @@ static unsigned long clk_pwm_recalc_rate(struct clk_hw *hw,
         return clk_pwm->fixed_rate;
 }
 
+static int clk_pwm_get_duty_cycle(struct clk_hw *hw, struct clk_duty *duty)
+{
+        struct clk_pwm *clk_pwm = to_clk_pwm(hw);
+        struct pwm_state state;
+
+        pwm_get_state(clk_pwm->pwm, &state);
+
+        duty->num = state.duty_cycle;
+        duty->den = state.period;
+
+        return 0;
+}
+
 static const struct clk_ops clk_pwm_ops = {
         .prepare = clk_pwm_prepare,
         .unprepare = clk_pwm_unprepare,
         .recalc_rate = clk_pwm_recalc_rate,
+        .get_duty_cycle = clk_pwm_get_duty_cycle,
 };
 
 static int clk_pwm_probe(struct platform_device *pdev)