gpio: tps65219: Update _IDX & _OFFSET macro prefix

TPS65215 and TPS65219 are overlapping PMIC devices. While their regulator
features differe, the GPIO features are the same. In the TPS65219 MFD
driver, the 2 PMICs share the same "tps65219-gpio" compatible string to
limit support for TPS65215 in this GPIO driver to comments.

The TPS6521X_GPIO0_IDX and TPS6521X_GPIO0_OFFSET macro name prefixes are
updated to indicate these macros apply to both PMICs.

Reviewed-by: Roger Quadros <rogerq@kernel.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Jonathan Cormier <jcormier@criticallink.com>
Signed-off-by: Shree Ramamoorthy <s-ramamoorthy@ti.com>
Link: https://lore.kernel.org/r/20250722181609.1541739-2-s-ramamoorthy@ti.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

Author: shramamoorthy

drivers/gpio/gpio-tps65219.c

@@ -1,8 +1,8 @@
 // SPDX-License-Identifier: GPL-2.0
 /*
- * GPIO driver for TI TPS65219 PMICs
+ * GPIO driver for TI TPS65215/TPS65219 PMICs
  *
- * Copyright (C) 2022 Texas Instruments Incorporated - http://www.ti.com/
+ * Copyright (C) 2022, 2025 Texas Instruments Incorporated - http://www.ti.com/
  */
 
 #include <linux/bits.h>
@@ -13,8 +13,15 @@
 #include <linux/regmap.h>
 
 #define TPS65219_GPIO0_DIR_MASK		BIT(3)
-#define TPS65219_GPIO0_OFFSET		2
-#define TPS65219_GPIO0_IDX		0
+#define TPS6521X_GPIO0_OFFSET		2
+#define TPS6521X_GPIO0_IDX		0
+
+/*
+ * TPS65215 & TPS65219 GPIO mapping
+ * Linux gpio offset 0 -> GPIO (pin16) -> bit_offset 2
+ * Linux gpio offset 1 -> GPO1 (pin8 ) -> bit_offset 0
+ * Linux gpio offset 2 -> GPO2 (pin17) -> bit_offset 1
+ */
 
 struct tps65219_gpio {
 	struct gpio_chip gpio_chip;
@@ -26,7 +33,7 @@ static int tps65219_gpio_get_direction(struct gpio_chip *gc, unsigned int offset
 	struct tps65219_gpio *gpio = gpiochip_get_data(gc);
 	int ret, val;
 
-	if (offset != TPS65219_GPIO0_IDX)
+	if (offset != TPS6521X_GPIO0_IDX)
 		return GPIO_LINE_DIRECTION_OUT;
 
 	ret = regmap_read(gpio->tps->regmap, TPS65219_REG_MFP_1_CONFIG, &val);
@@ -42,7 +49,7 @@ static int tps65219_gpio_get(struct gpio_chip *gc, unsigned int offset)
 	struct device *dev = gpio->tps->dev;
 	int ret, val;
 
-	if (offset != TPS65219_GPIO0_IDX) {
+	if (offset != TPS6521X_GPIO0_IDX) {
 		dev_err(dev, "GPIO%d is output only, cannot get\n", offset);
 		return -ENOTSUPP;
 	}
@@ -70,7 +77,7 @@ static int tps65219_gpio_set(struct gpio_chip *gc, unsigned int offset, int valu
 	struct tps65219_gpio *gpio = gpiochip_get_data(gc);
 	int v, mask, bit;
 
-	bit = (offset == TPS65219_GPIO0_IDX) ? TPS65219_GPIO0_OFFSET : offset - 1;
+	bit = (offset == TPS6521X_GPIO0_IDX) ? TPS6521X_GPIO0_OFFSET : offset - 1;
 
 	mask = BIT(bit);
 	v = value ? mask : 0;
@@ -116,7 +123,7 @@ static int tps65219_gpio_direction_input(struct gpio_chip *gc, unsigned int offs
 	struct tps65219_gpio *gpio = gpiochip_get_data(gc);
 	struct device *dev = gpio->tps->dev;
 
-	if (offset != TPS65219_GPIO0_IDX) {
+	if (offset != TPS6521X_GPIO0_IDX) {
 		dev_err(dev, "GPIO%d is output only, cannot change to input\n", offset);
 		return -ENOTSUPP;
 	}
@@ -130,7 +137,7 @@ static int tps65219_gpio_direction_input(struct gpio_chip *gc, unsigned int offs
 static int tps65219_gpio_direction_output(struct gpio_chip *gc, unsigned int offset, int value)
 {
 	tps65219_gpio_set(gc, offset, value);
-	if (offset != TPS65219_GPIO0_IDX)
+	if (offset != TPS6521X_GPIO0_IDX)
 		return 0;
 
 	if (tps65219_gpio_get_direction(gc, offset) == GPIO_LINE_DIRECTION_OUT)
@@ -178,5 +185,5 @@ module_platform_driver(tps65219_gpio_driver);
 
 MODULE_ALIAS("platform:tps65219-gpio");
 MODULE_AUTHOR("Jonathan Cormier <jcormier@criticallink.com>");
-MODULE_DESCRIPTION("TPS65219 GPIO driver");
+MODULE_DESCRIPTION("TPS65215/TPS65219 GPIO driver");
 MODULE_LICENSE("GPL");