pwm: adp5585: add support for adp5589

Add support for the adp5589 I/O expander. From a PWM point of view it is
pretty similar to adp5585. Main difference is the address
of registers meaningful for configuring the PWM.

Acked-by: Uwe Kleine-König <[e-mail]>
Signed-off-by: Nuno Sá <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Lee Jones <[e-mail]>

drivers/pwm/pwm-adp5585.c

···
 #define ADP5585_PWM_MIN_PERIOD_NS	(2ULL * NSEC_PER_SEC / ADP5585_PWM_OSC_FREQ_HZ)
 #define ADP5585_PWM_MAX_PERIOD_NS	(2ULL * 0xffff * NSEC_PER_SEC / ADP5585_PWM_OSC_FREQ_HZ)
 
+struct adp5585_pwm_chip {
+	unsigned int pwm_cfg;
+	unsigned int pwm_offt_low;
+	unsigned int pwm_ont_low;
+};
+
+struct adp5585_pwm {
+	const struct adp5585_pwm_chip *info;
+	struct regmap *regmap;
+	unsigned int ext_cfg;
+};
+
 static int pwm_adp5585_request(struct pwm_chip *chip, struct pwm_device *pwm)
 {
-	struct regmap *regmap = pwmchip_get_drvdata(chip);
+	struct adp5585_pwm *adp5585_pwm = pwmchip_get_drvdata(chip);
 
 	/* Configure the R3 pin as PWM output. */
-	return regmap_update_bits(regmap, ADP5585_PIN_CONFIG_C,
+	return regmap_update_bits(adp5585_pwm->regmap, adp5585_pwm->ext_cfg,
 				  ADP5585_R3_EXTEND_CFG_MASK,
 				  ADP5585_R3_EXTEND_CFG_PWM_OUT);
 }
 
 static void pwm_adp5585_free(struct pwm_chip *chip, struct pwm_device *pwm)
 {
-	struct regmap *regmap = pwmchip_get_drvdata(chip);
+	struct adp5585_pwm *adp5585_pwm = pwmchip_get_drvdata(chip);
 
-	regmap_update_bits(regmap, ADP5585_PIN_CONFIG_C,
+	regmap_update_bits(adp5585_pwm->regmap, adp5585_pwm->ext_cfg,
 			   ADP5585_R3_EXTEND_CFG_MASK,
 			   ADP5585_R3_EXTEND_CFG_GPIO4);
 }
···
 			     struct pwm_device *pwm,
 			     const struct pwm_state *state)
 {
-	struct regmap *regmap = pwmchip_get_drvdata(chip);
+	struct adp5585_pwm *adp5585_pwm = pwmchip_get_drvdata(chip);
+	const struct adp5585_pwm_chip *info = adp5585_pwm->info;
+	struct regmap *regmap = adp5585_pwm->regmap;
 	u64 period, duty_cycle;
 	u32 on, off;
 	__le16 val;
 	int ret;
 
 	if (!state->enabled) {
-		regmap_clear_bits(regmap, ADP5585_PWM_CFG, ADP5585_PWM_EN);
+		regmap_clear_bits(regmap, info->pwm_cfg, ADP5585_PWM_EN);
 		return 0;
 	}
 
···
 	off = div_u64(period, NSEC_PER_SEC / ADP5585_PWM_OSC_FREQ_HZ) - on;
 
 	val = cpu_to_le16(off);
-	ret = regmap_bulk_write(regmap, ADP5585_PWM_OFFT_LOW, &val, 2);
+	ret = regmap_bulk_write(regmap, info->pwm_offt_low, &val, 2);
 	if (ret)
 		return ret;
 
 	val = cpu_to_le16(on);
-	ret = regmap_bulk_write(regmap, ADP5585_PWM_ONT_LOW, &val, 2);
+	ret = regmap_bulk_write(regmap, info->pwm_ont_low, &val, 2);
 	if (ret)
 		return ret;
 
 	/* Enable PWM in continuous mode and no external AND'ing. */
-	ret = regmap_update_bits(regmap, ADP5585_PWM_CFG,
+	ret = regmap_update_bits(regmap, info->pwm_cfg,
 				 ADP5585_PWM_IN_AND | ADP5585_PWM_MODE |
 				 ADP5585_PWM_EN, ADP5585_PWM_EN);
 	if (ret)
 		return ret;
 
-	return regmap_set_bits(regmap, ADP5585_PWM_CFG, ADP5585_PWM_EN);
+	return regmap_set_bits(regmap, info->pwm_cfg, ADP5585_PWM_EN);
 }
 
 static int pwm_adp5585_get_state(struct pwm_chip *chip,
 				 struct pwm_device *pwm,
 				 struct pwm_state *state)
 {
-	struct regmap *regmap = pwmchip_get_drvdata(chip);
+	struct adp5585_pwm *adp5585_pwm = pwmchip_get_drvdata(chip);
+	const struct adp5585_pwm_chip *info = adp5585_pwm->info;
+	struct regmap *regmap = adp5585_pwm->regmap;
 	unsigned int on, off;
 	unsigned int val;
 	__le16 on_off;
 	int ret;
 
-	ret = regmap_bulk_read(regmap, ADP5585_PWM_OFFT_LOW, &on_off, 2);
+	ret = regmap_bulk_read(regmap, info->pwm_offt_low, &on_off, 2);
 	if (ret)
 		return ret;
 	off = le16_to_cpu(on_off);
 
-	ret = regmap_bulk_read(regmap, ADP5585_PWM_ONT_LOW, &on_off, 2);
+	ret = regmap_bulk_read(regmap, info->pwm_ont_low, &on_off, 2);
 	if (ret)
 		return ret;
 	on = le16_to_cpu(on_off);
···
 
 	state->polarity = PWM_POLARITY_NORMAL;
 
-	regmap_read(regmap, ADP5585_PWM_CFG, &val);
+	regmap_read(regmap, info->pwm_cfg, &val);
 	state->enabled = !!(val & ADP5585_PWM_EN);
 
 	return 0;
···
 
 static int adp5585_pwm_probe(struct platform_device *pdev)
 {
+	const struct platform_device_id *id = platform_get_device_id(pdev);
 	struct device *dev = &pdev->dev;
 	struct adp5585_dev *adp5585 = dev_get_drvdata(dev->parent);
+	struct adp5585_pwm *adp5585_pwm;
 	struct pwm_chip *chip;
 	int ret;
 
-	chip = devm_pwmchip_alloc(dev, ADP5585_PWM_CHAN_NUM, 0);
+	chip = devm_pwmchip_alloc(dev, ADP5585_PWM_CHAN_NUM,
+				  sizeof(*adp5585_pwm));
 	if (IS_ERR(chip))
 		return PTR_ERR(chip);
 
+	adp5585_pwm = pwmchip_get_drvdata(chip);
+	adp5585_pwm->regmap = adp5585->regmap;
+	adp5585_pwm->ext_cfg = adp5585->regs->ext_cfg;
+
+	adp5585_pwm->info = (const struct adp5585_pwm_chip *)id->driver_data;
+	if (!adp5585_pwm->info)
+		return -ENODEV;
+
 	device_set_of_node_from_dev(dev, dev->parent);
 
-	pwmchip_set_drvdata(chip, adp5585->regmap);
 	chip->ops = &adp5585_pwm_ops;
 
 	ret = devm_pwmchip_add(dev, chip);
···
 	return 0;
 }
 
+static const struct adp5585_pwm_chip adp5589_pwm_chip_info = {
+	.pwm_cfg = ADP5585_PWM_CFG,
+	.pwm_offt_low = ADP5585_PWM_OFFT_LOW,
+	.pwm_ont_low = ADP5585_PWM_ONT_LOW,
+};
+
+static const struct adp5585_pwm_chip adp5585_pwm_chip_info = {
+	.pwm_cfg = ADP5589_PWM_CFG,
+	.pwm_offt_low = ADP5589_PWM_OFFT_LOW,
+	.pwm_ont_low = ADP5589_PWM_ONT_LOW,
+};
+
 static const struct platform_device_id adp5585_pwm_id_table[] = {
-	{ "adp5585-pwm" },
+	{ "adp5585-pwm", (kernel_ulong_t)&adp5585_pwm_chip_info },
+	{ "adp5589-pwm", (kernel_ulong_t)&adp5589_pwm_chip_info },
 	{ /* Sentinel */ }
 };
 MODULE_DEVICE_TABLE(platform, adp5585_pwm_id_table);

include/linux/mfd/adp5585.h

···
 #define ADP5589_GPO_DATA_OUT_A		0x2a
 #define ADP5589_GPO_OUT_MODE_A		0x2d
 #define		ADP5589_GPIO_DIRECTION_A	0x30
+#define ADP5589_PWM_OFFT_LOW		0x3e
+#define ADP5589_PWM_ONT_LOW		0x40
+#define ADP5589_PWM_CFG			0x42
 #define ADP5589_PIN_CONFIG_D		0x4C
 #define ADP5589_INT_EN			0x4e
 #define ADP5589_MAX_REG			ADP5589_INT_EN