powerpc/8xx: Drop legacy-of-mm-gpiochip.h header

Remove legacy-of-mm-gpiochip.h header file. The above mentioned
file provides an OF API that's deprecated. There is no agnostic
alternatives to it and we have to open code the logic which was
hidden behind of_mm_gpiochip_add_data(). Note, most of the GPIO
drivers are using their own labeling schemas and resource retrieval
that only a few may gain of the code deduplication, so whenever
alternative is appear we can move drivers again to use that one.

As a side effect this change fixes a potential memory leak on
an error path, if of_mm_gpiochip_add_data() fails.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Acked-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20241118123254.620519-1-andriy.shevchenko@linux.intel.com

Author: andy-shev

arch/powerpc/platforms/8xx/cpm1.c

@@ -45,7 +45,7 @@
 #include <sysdev/fsl_soc.h>
 
 #ifdef CONFIG_8xx_GPIO
-#include <linux/gpio/legacy-of-mm-gpiochip.h>
+#include <linux/gpio/driver.h>
 #endif
 
 #define CPM_MAP_SIZE    (0x4000)
@@ -376,7 +376,8 @@ int __init cpm1_clk_setup(enum cpm_clk_target target, int clock, int mode)
 #ifdef CONFIG_8xx_GPIO
 
 struct cpm1_gpio16_chip {
-	struct of_mm_gpio_chip mm_gc;
+	struct gpio_chip gc;
+	void __iomem *regs;
 	spinlock_t lock;
 
 	/* shadowed data register to clear/set bits safely */
@@ -386,31 +387,27 @@ struct cpm1_gpio16_chip {
 	int irq[16];
 };
 
-static void cpm1_gpio16_save_regs(struct of_mm_gpio_chip *mm_gc)
+static void cpm1_gpio16_save_regs(struct cpm1_gpio16_chip *cpm1_gc)
 {
-	struct cpm1_gpio16_chip *cpm1_gc =
-		container_of(mm_gc, struct cpm1_gpio16_chip, mm_gc);
-	struct cpm_ioport16 __iomem *iop = mm_gc->regs;
+	struct cpm_ioport16 __iomem *iop = cpm1_gc->regs;
 
 	cpm1_gc->cpdata = in_be16(&iop->dat);
 }
 
 static int cpm1_gpio16_get(struct gpio_chip *gc, unsigned int gpio)
 {
-	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
-	struct cpm_ioport16 __iomem *iop = mm_gc->regs;
+	struct cpm1_gpio16_chip *cpm1_gc = gpiochip_get_data(gc);
+	struct cpm_ioport16 __iomem *iop = cpm1_gc->regs;
 	u16 pin_mask;
 
 	pin_mask = 1 << (15 - gpio);
 
 	return !!(in_be16(&iop->dat) & pin_mask);
 }
 
-static void __cpm1_gpio16_set(struct of_mm_gpio_chip *mm_gc, u16 pin_mask,
-	int value)
+static void __cpm1_gpio16_set(struct cpm1_gpio16_chip *cpm1_gc, u16 pin_mask, int value)
 {
-	struct cpm1_gpio16_chip *cpm1_gc = gpiochip_get_data(&mm_gc->gc);
-	struct cpm_ioport16 __iomem *iop = mm_gc->regs;
+	struct cpm_ioport16 __iomem *iop = cpm1_gc->regs;
 
 	if (value)
 		cpm1_gc->cpdata |= pin_mask;
@@ -422,38 +419,35 @@ static void __cpm1_gpio16_set(struct of_mm_gpio_chip *mm_gc, u16 pin_mask,
 
 static void cpm1_gpio16_set(struct gpio_chip *gc, unsigned int gpio, int value)
 {
-	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
-	struct cpm1_gpio16_chip *cpm1_gc = gpiochip_get_data(&mm_gc->gc);
+	struct cpm1_gpio16_chip *cpm1_gc = gpiochip_get_data(gc);
 	unsigned long flags;
 	u16 pin_mask = 1 << (15 - gpio);
 
 	spin_lock_irqsave(&cpm1_gc->lock, flags);
 
-	__cpm1_gpio16_set(mm_gc, pin_mask, value);
+	__cpm1_gpio16_set(cpm1_gc, pin_mask, value);
 
 	spin_unlock_irqrestore(&cpm1_gc->lock, flags);
 }
 
 static int cpm1_gpio16_to_irq(struct gpio_chip *gc, unsigned int gpio)
 {
-	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
-	struct cpm1_gpio16_chip *cpm1_gc = gpiochip_get_data(&mm_gc->gc);
+	struct cpm1_gpio16_chip *cpm1_gc = gpiochip_get_data(gc);
 
 	return cpm1_gc->irq[gpio] ? : -ENXIO;
 }
 
 static int cpm1_gpio16_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
 {
-	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
-	struct cpm1_gpio16_chip *cpm1_gc = gpiochip_get_data(&mm_gc->gc);
-	struct cpm_ioport16 __iomem *iop = mm_gc->regs;
+	struct cpm1_gpio16_chip *cpm1_gc = gpiochip_get_data(gc);
+	struct cpm_ioport16 __iomem *iop = cpm1_gc->regs;
 	unsigned long flags;
 	u16 pin_mask = 1 << (15 - gpio);
 
 	spin_lock_irqsave(&cpm1_gc->lock, flags);
 
 	setbits16(&iop->dir, pin_mask);
-	__cpm1_gpio16_set(mm_gc, pin_mask, val);
+	__cpm1_gpio16_set(cpm1_gc, pin_mask, val);
 
 	spin_unlock_irqrestore(&cpm1_gc->lock, flags);
 
@@ -462,9 +456,8 @@ static int cpm1_gpio16_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
 
 static int cpm1_gpio16_dir_in(struct gpio_chip *gc, unsigned int gpio)
 {
-	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
-	struct cpm1_gpio16_chip *cpm1_gc = gpiochip_get_data(&mm_gc->gc);
-	struct cpm_ioport16 __iomem *iop = mm_gc->regs;
+	struct cpm1_gpio16_chip *cpm1_gc = gpiochip_get_data(gc);
+	struct cpm_ioport16 __iomem *iop = cpm1_gc->regs;
 	unsigned long flags;
 	u16 pin_mask = 1 << (15 - gpio);
 
@@ -481,11 +474,10 @@ int cpm1_gpiochip_add16(struct device *dev)
 {
 	struct device_node *np = dev->of_node;
 	struct cpm1_gpio16_chip *cpm1_gc;
-	struct of_mm_gpio_chip *mm_gc;
 	struct gpio_chip *gc;
 	u16 mask;
 
-	cpm1_gc = kzalloc(sizeof(*cpm1_gc), GFP_KERNEL);
+	cpm1_gc = devm_kzalloc(dev, sizeof(*cpm1_gc), GFP_KERNEL);
 	if (!cpm1_gc)
 		return -ENOMEM;
 
@@ -499,10 +491,8 @@ int cpm1_gpiochip_add16(struct device *dev)
 				cpm1_gc->irq[i] = irq_of_parse_and_map(np, j++);
 	}
 
-	mm_gc = &cpm1_gc->mm_gc;
-	gc = &mm_gc->gc;
-
-	mm_gc->save_regs = cpm1_gpio16_save_regs;
+	gc = &cpm1_gc->gc;
+	gc->base = -1;
 	gc->ngpio = 16;
 	gc->direction_input = cpm1_gpio16_dir_in;
 	gc->direction_output = cpm1_gpio16_dir_out;
@@ -512,42 +502,49 @@ int cpm1_gpiochip_add16(struct device *dev)
 	gc->parent = dev;
 	gc->owner = THIS_MODULE;
 
-	return of_mm_gpiochip_add_data(np, mm_gc, cpm1_gc);
+	gc->label = devm_kasprintf(dev, GFP_KERNEL, "%pOF", np);
+	if (!gc->label)
+		return -ENOMEM;
+
+	cpm1_gc->regs = devm_of_iomap(dev, np, 0, NULL);
+	if (IS_ERR(cpm1_gc->regs))
+		return PTR_ERR(cpm1_gc->regs);
+
+	cpm1_gpio16_save_regs(cpm1_gc);
+
+	return devm_gpiochip_add_data(dev, gc, cpm1_gc);
 }
 
 struct cpm1_gpio32_chip {
-	struct of_mm_gpio_chip mm_gc;
+	struct gpio_chip gc;
+	void __iomem *regs;
 	spinlock_t lock;
 
 	/* shadowed data register to clear/set bits safely */
 	u32 cpdata;
 };
 
-static void cpm1_gpio32_save_regs(struct of_mm_gpio_chip *mm_gc)
+static void cpm1_gpio32_save_regs(struct cpm1_gpio32_chip *cpm1_gc)
 {
-	struct cpm1_gpio32_chip *cpm1_gc =
-		container_of(mm_gc, struct cpm1_gpio32_chip, mm_gc);
-	struct cpm_ioport32b __iomem *iop = mm_gc->regs;
+	struct cpm_ioport32b __iomem *iop = cpm1_gc->regs;
 
 	cpm1_gc->cpdata = in_be32(&iop->dat);
 }
 
 static int cpm1_gpio32_get(struct gpio_chip *gc, unsigned int gpio)
 {
-	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
-	struct cpm_ioport32b __iomem *iop = mm_gc->regs;
+	struct cpm1_gpio32_chip *cpm1_gc = gpiochip_get_data(gc);
+	struct cpm_ioport32b __iomem *iop = cpm1_gc->regs;
 	u32 pin_mask;
 
 	pin_mask = 1 << (31 - gpio);
 
 	return !!(in_be32(&iop->dat) & pin_mask);
 }
 
-static void __cpm1_gpio32_set(struct of_mm_gpio_chip *mm_gc, u32 pin_mask,
-	int value)
+static void __cpm1_gpio32_set(struct cpm1_gpio32_chip *cpm1_gc, u32 pin_mask, int value)
 {
-	struct cpm1_gpio32_chip *cpm1_gc = gpiochip_get_data(&mm_gc->gc);
-	struct cpm_ioport32b __iomem *iop = mm_gc->regs;
+	struct cpm_ioport32b __iomem *iop = cpm1_gc->regs;
 
 	if (value)
 		cpm1_gc->cpdata |= pin_mask;
@@ -559,30 +556,28 @@ static void __cpm1_gpio32_set(struct of_mm_gpio_chip *mm_gc, u32 pin_mask,
 
 static void cpm1_gpio32_set(struct gpio_chip *gc, unsigned int gpio, int value)
 {
-	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
-	struct cpm1_gpio32_chip *cpm1_gc = gpiochip_get_data(&mm_gc->gc);
+	struct cpm1_gpio32_chip *cpm1_gc = gpiochip_get_data(gc);
 	unsigned long flags;
 	u32 pin_mask = 1 << (31 - gpio);
 
 	spin_lock_irqsave(&cpm1_gc->lock, flags);
 
-	__cpm1_gpio32_set(mm_gc, pin_mask, value);
+	__cpm1_gpio32_set(cpm1_gc, pin_mask, value);
 
 	spin_unlock_irqrestore(&cpm1_gc->lock, flags);
 }
 
 static int cpm1_gpio32_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
 {
-	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
-	struct cpm1_gpio32_chip *cpm1_gc = gpiochip_get_data(&mm_gc->gc);
-	struct cpm_ioport32b __iomem *iop = mm_gc->regs;
+	struct cpm1_gpio32_chip *cpm1_gc = gpiochip_get_data(gc);
+	struct cpm_ioport32b __iomem *iop = cpm1_gc->regs;
 	unsigned long flags;
 	u32 pin_mask = 1 << (31 - gpio);
 
 	spin_lock_irqsave(&cpm1_gc->lock, flags);
 
 	setbits32(&iop->dir, pin_mask);
-	__cpm1_gpio32_set(mm_gc, pin_mask, val);
+	__cpm1_gpio32_set(cpm1_gc, pin_mask, val);
 
 	spin_unlock_irqrestore(&cpm1_gc->lock, flags);
 
@@ -591,9 +586,8 @@ static int cpm1_gpio32_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
 
 static int cpm1_gpio32_dir_in(struct gpio_chip *gc, unsigned int gpio)
 {
-	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
-	struct cpm1_gpio32_chip *cpm1_gc = gpiochip_get_data(&mm_gc->gc);
-	struct cpm_ioport32b __iomem *iop = mm_gc->regs;
+	struct cpm1_gpio32_chip *cpm1_gc = gpiochip_get_data(gc);
+	struct cpm_ioport32b __iomem *iop = cpm1_gc->regs;
 	unsigned long flags;
 	u32 pin_mask = 1 << (31 - gpio);
 
@@ -610,19 +604,16 @@ int cpm1_gpiochip_add32(struct device *dev)
 {
 	struct device_node *np = dev->of_node;
 	struct cpm1_gpio32_chip *cpm1_gc;
-	struct of_mm_gpio_chip *mm_gc;
 	struct gpio_chip *gc;
 
-	cpm1_gc = kzalloc(sizeof(*cpm1_gc), GFP_KERNEL);
+	cpm1_gc = devm_kzalloc(dev, sizeof(*cpm1_gc), GFP_KERNEL);
 	if (!cpm1_gc)
 		return -ENOMEM;
 
 	spin_lock_init(&cpm1_gc->lock);
 
-	mm_gc = &cpm1_gc->mm_gc;
-	gc = &mm_gc->gc;
-
-	mm_gc->save_regs = cpm1_gpio32_save_regs;
+	gc = &cpm1_gc->gc;
+	gc->base = -1;
 	gc->ngpio = 32;
 	gc->direction_input = cpm1_gpio32_dir_in;
 	gc->direction_output = cpm1_gpio32_dir_out;
@@ -631,7 +622,17 @@ int cpm1_gpiochip_add32(struct device *dev)
 	gc->parent = dev;
 	gc->owner = THIS_MODULE;
 
-	return of_mm_gpiochip_add_data(np, mm_gc, cpm1_gc);
+	gc->label = devm_kasprintf(dev, GFP_KERNEL, "%pOF", np);
+	if (!gc->label)
+		return -ENOMEM;
+
+	cpm1_gc->regs = devm_of_iomap(dev, np, 0, NULL);
+	if (IS_ERR(cpm1_gc->regs))
+		return PTR_ERR(cpm1_gc->regs);
+
+	cpm1_gpio32_save_regs(cpm1_gc);
+
+	return devm_gpiochip_add_data(dev, gc, cpm1_gc);
 }
 
 #endif /* CONFIG_8xx_GPIO */