tegra: Use const for pinmux_config_pingroup/table()

These two functions don't actually modify their arguments so add a const
keyword.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Tom Warren <twarren@nvidia.com>

arch/arm/cpu/tegra20-common/pinmux.c

@@ -554,7 +554,7 @@ void pinmux_set_func(enum pmux_pingrp pin, enum pmux_func func)
 	writel(reg, muxctl);
 }
 
-void pinmux_config_pingroup(struct pingroup_config *config)
+void pinmux_config_pingroup(const struct pingroup_config *config)
 {
 	enum pmux_pingrp pin = config->pingroup;
 
@@ -563,7 +563,7 @@ void pinmux_config_pingroup(struct pingroup_config *config)
 	pinmux_set_tristate(pin, config->tristate);
 }
 
-void pinmux_config_table(struct pingroup_config *config, int len)
+void pinmux_config_table(const struct pingroup_config *config, int len)
 {
 	int i;
 

arch/arm/include/asm/arch-tegra20/pinmux.h

@@ -339,7 +339,7 @@ void pinmux_set_pullupdown(enum pmux_pingrp pin, enum pmux_pull pupd);
 void pinmux_set_func(enum pmux_pingrp pin, enum pmux_func func);
 
 /* Set the complete configuration for a pin group */
-void pinmux_config_pingroup(struct pingroup_config *config);
+void pinmux_config_pingroup(const struct pingroup_config *config);
 
 void pinmux_set_tristate(enum pmux_pingrp pin, int enable);
 
@@ -349,6 +349,6 @@ void pinmux_set_tristate(enum pmux_pingrp pin, int enable);
  * @param config	List of config items
  * @param len		Number of config items in list
  */
-void pinmux_config_table(struct pingroup_config *config, int len);
+void pinmux_config_table(const struct pingroup_config *config, int len);
 
 #endif	/* PINMUX_H */