clk: samsung: Make of_device_id array const

Array of struct of_device_id may be be const as expected by
of_match_table field and of_find_matching_node_and_match() function.
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Reviewed-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Tomasz Figa <t.figa@samsung.com>

drivers/clk/samsung/clk-exynos4.c

@@ -1254,7 +1254,7 @@ static void __init exynos4_clk_register_finpll(struct samsung_clk_provider *ctx)
 
 }
 
-static struct of_device_id ext_clk_match[] __initdata = {
+static const struct of_device_id ext_clk_match[] __initconst = {
 	{ .compatible = "samsung,clock-xxti", .data = (void *)0, },
 	{ .compatible = "samsung,clock-xusbxti", .data = (void *)1, },
 	{},

drivers/clk/samsung/clk-exynos5250.c

@@ -748,7 +748,7 @@ static struct samsung_pll_clock exynos5250_plls[nr_plls] __initdata = {
 		VPLL_LOCK, VPLL_CON0, NULL),
 };
 
-static struct of_device_id ext_clk_match[] __initdata = {
+static const struct of_device_id ext_clk_match[] __initconst = {
 	{ .compatible = "samsung,clock-xxti", .data = (void *)0, },
 	{ },
 };

drivers/clk/samsung/clk-exynos5420.c

@@ -1192,7 +1192,7 @@ static struct samsung_pll_clock exynos5x_plls[nr_plls] __initdata = {
 		KPLL_CON0, NULL),
 };
 
-static struct of_device_id ext_clk_match[] __initdata = {
+static const struct of_device_id ext_clk_match[] __initconst = {
 	{ .compatible = "samsung,exynos5420-oscclk", .data = (void *)0, },
 	{ },
 };

drivers/clk/samsung/clk-exynos5440.c

@@ -84,7 +84,7 @@ static struct samsung_gate_clock exynos5440_gate_clks[] __initdata = {
 	GATE(CLK_CS250_O, "cs250_o", "cs250", CLKEN_OV_VAL, 19, 0, 0),
 };
 
-static struct of_device_id ext_clk_match[] __initdata = {
+static const struct of_device_id ext_clk_match[] __initconst = {
 	{ .compatible = "samsung,clock-xtal", .data = (void *)0, },
 	{},
 };

drivers/clk/samsung/clk.c

@@ -285,7 +285,7 @@ void __init samsung_clk_register_gate(struct samsung_clk_provider *ctx,
 void __init samsung_clk_of_register_fixed_ext(struct samsung_clk_provider *ctx,
 			struct samsung_fixed_rate_clock *fixed_rate_clk,
 			unsigned int nr_fixed_rate_clk,
-			struct of_device_id *clk_matches)
+			const struct of_device_id *clk_matches)
 {
 	const struct of_device_id *match;
 	struct device_node *clk_np;

drivers/clk/samsung/clk.h

@@ -333,7 +333,7 @@ extern void __init samsung_clk_of_register_fixed_ext(
 			struct samsung_clk_provider *ctx,
 			struct samsung_fixed_rate_clock *fixed_rate_clk,
 			unsigned int nr_fixed_rate_clk,
-			struct of_device_id *clk_matches);
+			const struct of_device_id *clk_matches);
 
 extern void samsung_clk_add_lookup(struct samsung_clk_provider *ctx,
 			struct clk *clk, unsigned int id);