pwm: sprd: Rework how the available channels are counted

To be able to convert the sprd driver to pwmchip_alloc() the number of
PWM channels must be known when the driver private data is allocated. So
make sprd_pwm_clk_init() not take a struct sprd_pwm_chip. On the plus
side this allows to drop a member of said driver private data.
Reviewed-by: Chunyan Zhang <zhang.lyra@gmail.com>
Link: https://lore.kernel.org/r/682cbbafbfc4982383d66c3871bb9e52d4e03195.1707900770.git.u.kleine-koenig@pengutronix.deSigned-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>

drivers/pwm/pwm-sprd.c

@@ -36,7 +36,6 @@ struct sprd_pwm_chip {
 	void __iomem *base;
 	struct device *dev;
 	struct pwm_chip chip;
-	int num_pwms;
 	struct sprd_pwm_chn chn[SPRD_PWM_CHN_NUM];
 };
 
@@ -215,45 +214,48 @@ static const struct pwm_ops sprd_pwm_ops = {
 	.get_state = sprd_pwm_get_state,
 };
 
-static int sprd_pwm_clk_init(struct sprd_pwm_chip *spc)
+static int sprd_pwm_clk_init(struct device *dev,
+			     struct sprd_pwm_chn chn[SPRD_PWM_CHN_NUM])
 {
 	struct clk *clk_pwm;
 	int ret, i;
 
 	for (i = 0; i < SPRD_PWM_CHN_NUM; i++) {
-		struct sprd_pwm_chn *chn = &spc->chn[i];
 		int j;
 
 		for (j = 0; j < SPRD_PWM_CHN_CLKS_NUM; ++j)
-			chn->clks[j].id =
+			chn[i].clks[j].id =
 				sprd_pwm_clks[i * SPRD_PWM_CHN_CLKS_NUM + j];
 
-		ret = devm_clk_bulk_get(spc->dev, SPRD_PWM_CHN_CLKS_NUM,
-					chn->clks);
+		ret = devm_clk_bulk_get(dev, SPRD_PWM_CHN_CLKS_NUM,
+					chn[i].clks);
 		if (ret) {
 			if (ret == -ENOENT)
 				break;
 
-			return dev_err_probe(spc->dev, ret,
+			return dev_err_probe(dev, ret,
 					     "failed to get channel clocks\n");
 		}
 
-		clk_pwm = chn->clks[SPRD_PWM_CHN_OUTPUT_CLK].clk;
-		chn->clk_rate = clk_get_rate(clk_pwm);
+		clk_pwm = chn[i].clks[SPRD_PWM_CHN_OUTPUT_CLK].clk;
+		chn[i].clk_rate = clk_get_rate(clk_pwm);
 	}
 
 	if (!i)
-		return dev_err_probe(spc->dev, -ENODEV, "no available PWM channels\n");
+		return dev_err_probe(dev, -ENODEV, "no available PWM channels\n");
 
-	spc->num_pwms = i;
-
-	return 0;
+	return i;
 }
 
 static int sprd_pwm_probe(struct platform_device *pdev)
 {
 	struct sprd_pwm_chip *spc;
-	int ret;
+	struct sprd_pwm_chn chn[SPRD_PWM_CHN_NUM];
+	int ret, npwm;
+
+	npwm = sprd_pwm_clk_init(&pdev->dev, chn);
+	if (npwm < 0)
+		return npwm;
 
 	spc = devm_kzalloc(&pdev->dev, sizeof(*spc), GFP_KERNEL);
 	if (!spc)
@@ -264,14 +266,11 @@ static int sprd_pwm_probe(struct platform_device *pdev)
 		return PTR_ERR(spc->base);
 
 	spc->dev = &pdev->dev;
-
-	ret = sprd_pwm_clk_init(spc);
-	if (ret)
-		return ret;
+	memcpy(spc->chn, chn, sizeof(chn));
 
 	spc->chip.dev = &pdev->dev;
 	spc->chip.ops = &sprd_pwm_ops;
-	spc->chip.npwm = spc->num_pwms;
+	spc->chip.npwm = npwm;
 
 	ret = devm_pwmchip_add(&pdev->dev, &spc->chip);
 	if (ret)