Merge v6.15.4linux-rolling-stable

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 20 insertions, 3 deletions

diff --git a/drivers/pwm/pwm-axi-pwmgen.c b/drivers/pwm/pwm-axi-pwmgen.c
index 4337c8f5acf0..60dcd3542373 100644
--- a/drivers/pwm/pwm-axi-pwmgen.c
+++ b/drivers/pwm/pwm-axi-pwmgen.c
@@ -257,7 +257,7 @@ static int axi_pwmgen_probe(struct platform_device *pdev)
 	struct regmap *regmap;
 	struct pwm_chip *chip;
 	struct axi_pwmgen_ddata *ddata;
-	struct clk *clk;
+	struct clk *axi_clk, *clk;
 	void __iomem *io_base;
 	int ret;
 
@@ -280,9 +280,26 @@ static int axi_pwmgen_probe(struct platform_device *pdev)
 	ddata = pwmchip_get_drvdata(chip);
 	ddata->regmap = regmap;
 
-	clk = devm_clk_get_enabled(dev, NULL);
+	/*
+	 * Using NULL here instead of "axi" for backwards compatibility. There
+	 * are some dtbs that don't give clock-names and have the "ext" clock
+	 * as the one and only clock (due to mistake in the original bindings).
+	 */
+	axi_clk = devm_clk_get_enabled(dev, NULL);
+	if (IS_ERR(axi_clk))
+		return dev_err_probe(dev, PTR_ERR(axi_clk), "failed to get axi clock\n");
+
+	clk = devm_clk_get_optional_enabled(dev, "ext");
 	if (IS_ERR(clk))
-		return dev_err_probe(dev, PTR_ERR(clk), "failed to get clock\n");
+		return dev_err_probe(dev, PTR_ERR(clk), "failed to get ext clock\n");
+
+	/*
+	 * If there is no "ext" clock, it means the HDL was compiled with
+	 * ASYNC_CLK_EN=0. In this case, the AXI clock is also used for the
+	 * PWM output clock.
+	 */
+	if (!clk)
+		clk = axi_clk;
 
 	ret = devm_clk_rate_exclusive_get(dev, clk);
 	if (ret)