clk: at91: clk-system: add support for parent_hw

Add support for parent_hw in system 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-system 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/20230615093227.576102-7-claudiu.beznea@microchip.com

Author: claudiubeznea

drivers/clk/at91/at91rm9200.c

@@ -182,7 +182,7 @@ static void __init at91rm9200_pmc_setup(struct device_node *np)
 
 	for (i = 0; i < ARRAY_SIZE(at91rm9200_systemck); i++) {
 		hw = at91_clk_register_system(regmap, at91rm9200_systemck[i].n,
-					      at91rm9200_systemck[i].p,
+					      at91rm9200_systemck[i].p, NULL,
 					      at91rm9200_systemck[i].id, 0);
 		if (IS_ERR(hw))
 			goto err_free;

drivers/clk/at91/at91sam9260.c

@@ -459,7 +459,7 @@ static void __init at91sam926x_pmc_setup(struct device_node *np,
 
 	for (i = 0; i < data->num_sck; i++) {
 		hw = at91_clk_register_system(regmap, data->sck[i].n,
-					      data->sck[i].p,
+					      data->sck[i].p, NULL,
 					      data->sck[i].id, 0);
 		if (IS_ERR(hw))
 			goto err_free;

drivers/clk/at91/at91sam9g45.c

@@ -202,7 +202,7 @@ static void __init at91sam9g45_pmc_setup(struct device_node *np)
 
 	for (i = 0; i < ARRAY_SIZE(at91sam9g45_systemck); i++) {
 		hw = at91_clk_register_system(regmap, at91sam9g45_systemck[i].n,
-					      at91sam9g45_systemck[i].p,
+					      at91sam9g45_systemck[i].p, NULL,
 					      at91sam9g45_systemck[i].id,
 					      at91sam9g45_systemck[i].flags);
 		if (IS_ERR(hw))

drivers/clk/at91/at91sam9n12.c

@@ -227,7 +227,7 @@ static void __init at91sam9n12_pmc_setup(struct device_node *np)
 
 	for (i = 0; i < ARRAY_SIZE(at91sam9n12_systemck); i++) {
 		hw = at91_clk_register_system(regmap, at91sam9n12_systemck[i].n,
-					      at91sam9n12_systemck[i].p,
+					      at91sam9n12_systemck[i].p, NULL,
 					      at91sam9n12_systemck[i].id,
 					      at91sam9n12_systemck[i].flags);
 		if (IS_ERR(hw))

drivers/clk/at91/at91sam9rl.c

@@ -159,7 +159,7 @@ static void __init at91sam9rl_pmc_setup(struct device_node *np)
 
 	for (i = 0; i < ARRAY_SIZE(at91sam9rl_systemck); i++) {
 		hw = at91_clk_register_system(regmap, at91sam9rl_systemck[i].n,
-					      at91sam9rl_systemck[i].p,
+					      at91sam9rl_systemck[i].p, NULL,
 					      at91sam9rl_systemck[i].id, 0);
 		if (IS_ERR(hw))
 			goto err_free;

drivers/clk/at91/at91sam9x5.c

@@ -252,7 +252,7 @@ static void __init at91sam9x5_pmc_setup(struct device_node *np,
 
 	for (i = 0; i < ARRAY_SIZE(at91sam9x5_systemck); i++) {
 		hw = at91_clk_register_system(regmap, at91sam9x5_systemck[i].n,
-					      at91sam9x5_systemck[i].p,
+					      at91sam9x5_systemck[i].p, NULL,
 					      at91sam9x5_systemck[i].id,
 					      at91sam9x5_systemck[i].flags);
 		if (IS_ERR(hw))
@@ -263,7 +263,7 @@ static void __init at91sam9x5_pmc_setup(struct device_node *np,
 
 	if (has_lcdck) {
 		hw = at91_clk_register_system(regmap, "lcdck", "masterck_div",
-					      3, 0);
+					      NULL, 3, 0);
 		if (IS_ERR(hw))
 			goto err_free;
 

drivers/clk/at91/clk-system.c

@@ -105,14 +105,15 @@ static const struct clk_ops system_ops = {
 
 struct clk_hw * __init
 at91_clk_register_system(struct regmap *regmap, const char *name,
-			 const char *parent_name, u8 id, unsigned long flags)
+			 const char *parent_name, struct clk_hw *parent_hw, u8 id,
+			 unsigned long flags)
 {
 	struct clk_system *sys;
 	struct clk_hw *hw;
-	struct clk_init_data init;
+	struct clk_init_data init = {};
 	int ret;
 
-	if (!parent_name || id > SYSTEM_MAX_ID)
+	if (!(parent_name || parent_hw) || id > SYSTEM_MAX_ID)
 		return ERR_PTR(-EINVAL);
 
 	sys = kzalloc(sizeof(*sys), GFP_KERNEL);
@@ -121,7 +122,10 @@ at91_clk_register_system(struct regmap *regmap, const char *name,
 
 	init.name = name;
 	init.ops = &system_ops;
-	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;
 	init.flags = CLK_SET_RATE_PARENT | flags;
 

drivers/clk/at91/dt-compat.c

@@ -908,8 +908,8 @@ static void __init of_at91rm9200_clk_sys_setup(struct device_node *np)
 		if (!strcmp(sysclknp->name, "ddrck"))
 			flags = CLK_IS_CRITICAL;
 
-		hw = at91_clk_register_system(regmap, name, parent_name, id,
-					      flags);
+		hw = at91_clk_register_system(regmap, name, parent_name, NULL,
+					      id, flags);
 		if (IS_ERR(hw))
 			continue;
 

drivers/clk/at91/pmc.h

@@ -251,7 +251,8 @@ at91sam9x5_clk_register_smd(struct regmap *regmap, const char *name,
 
 struct clk_hw * __init
 at91_clk_register_system(struct regmap *regmap, const char *name,
-			 const char *parent_name, u8 id, unsigned long flags);
+			 const char *parent_name, struct clk_hw *parent_hw,
+			 u8 id, unsigned long flags);
 
 struct clk_hw * __init
 at91sam9x5_clk_register_usb(struct regmap *regmap, const char *name,

drivers/clk/at91/sam9x60.c

@@ -324,7 +324,7 @@ static void __init sam9x60_pmc_setup(struct device_node *np)
 
 	for (i = 0; i < ARRAY_SIZE(sam9x60_systemck); i++) {
 		hw = at91_clk_register_system(regmap, sam9x60_systemck[i].n,
-					      sam9x60_systemck[i].p,
+					      sam9x60_systemck[i].p, NULL,
 					      sam9x60_systemck[i].id,
 					      sam9x60_systemck[i].flags);
 		if (IS_ERR(hw))