[PATCH v2 2/2] pwm: pxa: Add optional bus clock

[Yixun Lan <dlan@kernel.org>]

Add one secondary optional bus clock for the PWM PXA driver, also keep it
compatible with old single clock.

The SpacemiT K3 SoC require a bus clock for PWM controller, acquire and
enable it during probe phase.

Signed-off-by: Yixun Lan <dlan@kernel.org>
---
 drivers/pwm/pwm-pxa.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/pwm/pwm-pxa.c b/drivers/pwm/pwm-pxa.c
index 0f5bdb0e395e..80d2fa10919f 100644
--- a/drivers/pwm/pwm-pxa.c
+++ b/drivers/pwm/pwm-pxa.c
@@ -161,6 +161,7 @@ static int pwm_probe(struct platform_device *pdev)
 	const struct platform_device_id *id = platform_get_device_id(pdev);
 	struct pwm_chip *chip;
 	struct pxa_pwm_chip *pc;
+	struct clk *bus_clk;
 	struct device *dev = &pdev->dev;
 	struct reset_control *rst;
 	int ret = 0;
@@ -177,7 +178,12 @@ static int pwm_probe(struct platform_device *pdev)
 		return PTR_ERR(chip);
 	pc = to_pxa_pwm_chip(chip);
 
-	pc->clk = devm_clk_get(dev, NULL);
+	bus_clk = devm_clk_get_optional_enabled(dev, "bus");
+	if (IS_ERR(bus_clk))
+		return dev_err_probe(dev, PTR_ERR(bus_clk), "Failed to get bus clock\n");
+
+	/* Get named func clk if bus clock is valid */
+	pc->clk = devm_clk_get(dev, bus_clk ? "func" : NULL);
 	if (IS_ERR(pc->clk))
 		return dev_err_probe(dev, PTR_ERR(pc->clk), "Failed to get clock\n");
 

-- 
2.53.0