pwm: pxa: Add optional bus clock

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>
Link: https://patch.msgid.link/20260428-03-k3-pwm-drv-v2-2-a532bbe45556@kernel.org
Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>

diff --git a/drivers/pwm/pwm-pxa.c b/drivers/pwm/pwm-pxa.c
index 0f5bdb0e395ea0a0e4dc2481e2e19e5e8a2a9e8a..80d2fa10919f86569050bae86fd642bffa2469e5 100644 (file)
--- 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");