修改led为gpio

hc

2024-10-12 a5969cabbb4660eab42b6ef0412cbbd1200cf14d

 kernel/drivers/pwm/pwm-bcm2835.c
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@@ -1,9 +1,6 @@
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+// SPDX-License-Identifier: GPL-2.0
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 /*
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  * Copyright 2014 Bart Tanghe <bart.tanghe@thomasmore.be>
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License as published by
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- * the Free Software Foundation; version 2.
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  */
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 #include <linux/clk.h>
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@@ -24,7 +21,7 @@
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 #define PERIOD(x)		(((x) * 0x10) + 0x10)
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 #define DUTY(x)			(((x) * 0x10) + 0x14)
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-#define MIN_PERIOD		108		/* 9.2 MHz max. PWM clock */
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+#define PERIOD_MIN		0x2
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 struct bcm2835_pwm {
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 	struct pwm_chip chip;
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@@ -67,22 +64,22 @@
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 	struct bcm2835_pwm *pc = to_bcm2835_pwm(chip);
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 	unsigned long rate = clk_get_rate(pc->clk);
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 	unsigned long scaler;
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+	u32 period;
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 	if (!rate) {
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 		dev_err(pc->dev, "failed to get clock rate\n");
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 		return -EINVAL;
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 	}
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-	scaler = NSEC_PER_SEC / rate;
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+	scaler = DIV_ROUND_CLOSEST(NSEC_PER_SEC, rate);
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+	period = DIV_ROUND_CLOSEST(period_ns, scaler);
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-	if (period_ns <= MIN_PERIOD) {
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-		dev_err(pc->dev, "period %d not supported, minimum %d\n",
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-			period_ns, MIN_PERIOD);
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+	if (period < PERIOD_MIN)
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 		return -EINVAL;
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-	}
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-	writel(duty_ns / scaler, pc->base + DUTY(pwm->hwpwm));
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-	writel(period_ns / scaler, pc->base + PERIOD(pwm->hwpwm));
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+	writel(DIV_ROUND_CLOSEST(duty_ns, scaler),
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+	       pc->base + DUTY(pwm->hwpwm));
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+	writel(period, pc->base + PERIOD(pwm->hwpwm));
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 	return 0;
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 }
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@@ -155,10 +152,9 @@
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 		return PTR_ERR(pc->base);
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 	pc->clk = devm_clk_get(&pdev->dev, NULL);
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-	if (IS_ERR(pc->clk)) {
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-		dev_err(&pdev->dev, "clock not found: %ld\n", PTR_ERR(pc->clk));
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-		return PTR_ERR(pc->clk);
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-	}
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+	if (IS_ERR(pc->clk))
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+		return dev_err_probe(&pdev->dev, PTR_ERR(pc->clk),
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+				     "clock not found\n");
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 	ret = clk_prepare_enable(pc->clk);
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 	if (ret)