pwm: jz4740: Add support for the JZ4725B

The PWM hardware in the JZ4725B works the same as in the JZ4740, but has
only six channels available.
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

drivers/pwm/pwm-jz4740.c

@@ -20,7 +20,9 @@
 #include <linux/pwm.h>
 #include <linux/regmap.h>
 
-#define NUM_PWM 8
+struct soc_info {
+	unsigned int num_pwms;
+};
 
 struct jz4740_pwm_chip {
 	struct pwm_chip chip;
@@ -36,7 +38,7 @@ static bool jz4740_pwm_can_use_chn(struct jz4740_pwm_chip *jz,
 				   unsigned int channel)
 {
 	/* Enable all TCU channels for PWM use by default except channels 0/1 */
-	u32 pwm_channels_mask = GENMASK(NUM_PWM - 1, 2);
+	u32 pwm_channels_mask = GENMASK(jz->chip.npwm - 1, 2);
 
 	device_property_read_u32(jz->chip.dev->parent,
 				 "ingenic,pwm-channels-mask",
@@ -226,6 +228,11 @@ static int jz4740_pwm_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct jz4740_pwm_chip *jz4740;
+	const struct soc_info *info;
+
+	info = device_get_match_data(dev);
+	if (!info)
+		return -EINVAL;
 
 	jz4740 = devm_kzalloc(dev, sizeof(*jz4740), GFP_KERNEL);
 	if (!jz4740)
@@ -239,7 +246,7 @@ static int jz4740_pwm_probe(struct platform_device *pdev)
 
 	jz4740->chip.dev = dev;
 	jz4740->chip.ops = &jz4740_pwm_ops;
-	jz4740->chip.npwm = NUM_PWM;
+	jz4740->chip.npwm = info->num_pwms;
 	jz4740->chip.base = -1;
 	jz4740->chip.of_xlate = of_pwm_xlate_with_flags;
 	jz4740->chip.of_pwm_n_cells = 3;
@@ -256,9 +263,18 @@ static int jz4740_pwm_remove(struct platform_device *pdev)
 	return pwmchip_remove(&jz4740->chip);
 }
 
+static const struct soc_info __maybe_unused jz4740_soc_info = {
+	.num_pwms = 8,
+};
+
+static const struct soc_info __maybe_unused jz4725b_soc_info = {
+	.num_pwms = 6,
+};
+
 #ifdef CONFIG_OF
 static const struct of_device_id jz4740_pwm_dt_ids[] = {
-	{ .compatible = "ingenic,jz4740-pwm", },
+	{ .compatible = "ingenic,jz4740-pwm", .data = &jz4740_soc_info },
+	{ .compatible = "ingenic,jz4725b-pwm", .data = &jz4725b_soc_info },
 	{},
 };
 MODULE_DEVICE_TABLE(of, jz4740_pwm_dt_ids);