clk: at91: clk-sam9x60-pll: add support for parent_hw

Add support for parent_hw in SAM9X60 PLL clock drivers.
With this parent-child relation is described with pointers rather
than strings making registration a bit faster.

All the SoC based drivers that rely on clk-sam9x60-pll were adapted
to the new API change. The switch itself for SoCs will be done
in subsequent patches.

Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Reviewed-by: Maxime Ripard <mripard@kernel.org>
Link: https://lore.kernel.org/r/20230615093227.576102-9-claudiu.beznea@microchip.com

Author: claudiubeznea

drivers/clk/at91/clk-sam9x60-pll.c

@@ -616,7 +616,7 @@ sam9x60_clk_register_frac_pll(struct regmap *regmap, spinlock_t *lock,
 {
 	struct sam9x60_frac *frac;
 	struct clk_hw *hw;
-	struct clk_init_data init;
+	struct clk_init_data init = {};
 	unsigned long parent_rate, irqflags;
 	unsigned int val;
 	int ret;
@@ -629,7 +629,10 @@ sam9x60_clk_register_frac_pll(struct regmap *regmap, spinlock_t *lock,
 		return ERR_PTR(-ENOMEM);
 
 	init.name = name;
-	init.parent_names = &parent_name;
+	if (parent_name)
+		init.parent_names = &parent_name;
+	else
+		init.parent_hws = (const struct clk_hw **)&parent_hw;
 	init.num_parents = 1;
 	if (flags & CLK_SET_RATE_GATE)
 		init.ops = &sam9x60_frac_pll_ops;
@@ -692,14 +695,15 @@ sam9x60_clk_register_frac_pll(struct regmap *regmap, spinlock_t *lock,
 
 struct clk_hw * __init
 sam9x60_clk_register_div_pll(struct regmap *regmap, spinlock_t *lock,
-			     const char *name, const char *parent_name, u8 id,
+			     const char *name, const char *parent_name,
+			     struct clk_hw *parent_hw, u8 id,
 			     const struct clk_pll_characteristics *characteristics,
 			     const struct clk_pll_layout *layout, u32 flags,
 			     u32 safe_div)
 {
 	struct sam9x60_div *div;
 	struct clk_hw *hw;
-	struct clk_init_data init;
+	struct clk_init_data init = {};
 	unsigned long irqflags;
 	unsigned int val;
 	int ret;
@@ -716,7 +720,10 @@ sam9x60_clk_register_div_pll(struct regmap *regmap, spinlock_t *lock,
 		return ERR_PTR(-ENOMEM);
 
 	init.name = name;
-	init.parent_names = &parent_name;
+	if (parent_hw)
+		init.parent_hws = (const struct clk_hw **)&parent_hw;
+	else
+		init.parent_names = &parent_name;
 	init.num_parents = 1;
 	if (flags & CLK_SET_RATE_GATE)
 		init.ops = &sam9x60_div_pll_ops;

drivers/clk/at91/pmc.h

@@ -220,7 +220,8 @@ at91_clk_register_plldiv(struct regmap *regmap, const char *name,
 
 struct clk_hw * __init
 sam9x60_clk_register_div_pll(struct regmap *regmap, spinlock_t *lock,
-			     const char *name, const char *parent_name, u8 id,
+			     const char *name, const char *parent_name,
+			     struct clk_hw *parent_hw, u8 id,
 			     const struct clk_pll_characteristics *characteristics,
 			     const struct clk_pll_layout *layout, u32 flags,
 			     u32 safe_div);

drivers/clk/at91/sam9x60.c

@@ -246,7 +246,7 @@ static void __init sam9x60_pmc_setup(struct device_node *np)
 		goto err_free;
 
 	hw = sam9x60_clk_register_div_pll(regmap, &pmc_pll_lock, "pllack_divck",
-					  "pllack_fracck", 0, &plla_characteristics,
+					  "pllack_fracck", NULL, 0, &plla_characteristics,
 					  &pll_div_layout,
 					   /*
 					    * This feeds CPU. It should not
@@ -266,7 +266,7 @@ static void __init sam9x60_pmc_setup(struct device_node *np)
 		goto err_free;
 
 	hw = sam9x60_clk_register_div_pll(regmap, &pmc_pll_lock, "upllck_divck",
-					  "upllck_fracck", 1, &upll_characteristics,
+					  "upllck_fracck", NULL, 1, &upll_characteristics,
 					  &pll_div_layout,
 					  CLK_SET_RATE_GATE |
 					  CLK_SET_PARENT_GATE |

drivers/clk/at91/sama7g5.c

@@ -975,7 +975,7 @@ static void __init sama7g5_pmc_setup(struct device_node *np)
 			case PLL_TYPE_DIV:
 				hw = sam9x60_clk_register_div_pll(regmap,
 					&pmc_pll_lock, sama7g5_plls[i][j].n,
-					sama7g5_plls[i][j].p, i,
+					sama7g5_plls[i][j].p, NULL, i,
 					sama7g5_plls[i][j].c,
 					sama7g5_plls[i][j].l,
 					sama7g5_plls[i][j].f,