devres: allow const resource arguments

devm_ioremap_resource() does not currently take 'const' arguments, which
results in a warning from the first driver trying to do it anyway:

  drivers/gpio/gpio-amd-fch.c: In function 'amd_fch_gpio_probe':
  drivers/gpio/gpio-amd-fch.c:171:49: error: passing argument 2 of 'devm_ioremap_resource' discards 'const' qualifier from pointer target type [-Werror=discarded-qualifiers]
    priv->base = devm_ioremap_resource(&pdev->dev, &amd_fch_gpio_iores);

Change the prototype to allow it, as there is no real reason not to.

Fixes: 9bb2e0452508 ("gpio: amd: Make resource struct const")
Signed-off-by: Arnd Bergmann <>
Acked-by: Greg Kroah-Hartman <>
Reviewed-by: Enrico Weigelt <>
Reviewed-by: Andrew Morton <>
Cc: Greg Kroah-Hartman <>
Cc: Linus Walleij <>
Cc: Arnd Bergmann <>
Cc: "Rafael J. Wysocki" <>
Cc: Ulf Hansson <>
Cc: Andy Shevchenko <>
Cc: Heikki Krogerus <>
Signed-off-by: Andrew Morton <>
Signed-off-by: Linus Torvalds <>
diff --git a/include/linux/device.h b/include/linux/device.h
index 848fc71..4a295e3 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -704,7 +704,8 @@
 					 gfp_t gfp_mask, unsigned int order);
 extern void devm_free_pages(struct device *dev, unsigned long addr);
-void __iomem *devm_ioremap_resource(struct device *dev, struct resource *res);
+void __iomem *devm_ioremap_resource(struct device *dev,
+				    const struct resource *res);
 void __iomem *devm_of_iomap(struct device *dev,
 			    struct device_node *node, int index,
diff --git a/lib/devres.c b/lib/devres.c
index 69bed2f..6a0e9bd 100644
--- a/lib/devres.c
+++ b/lib/devres.c
@@ -131,7 +131,8 @@
  *	if (IS_ERR(base))
  *		return PTR_ERR(base);
-void __iomem *devm_ioremap_resource(struct device *dev, struct resource *res)
+void __iomem *devm_ioremap_resource(struct device *dev,
+				    const struct resource *res)
 	resource_size_t size;
 	void __iomem *dest_ptr;