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

Add support for parent_hw in generic 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-generated 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/20230615093227.576102-3-claudiu.beznea@microchip.com

Author: claudiubeznea

drivers/clk/at91/clk-generated.c

@@ -319,22 +319,29 @@ struct clk_hw * __init
 at91_clk_register_generated(struct regmap *regmap, spinlock_t *lock,
 			    const struct clk_pcr_layout *layout,
 			    const char *name, const char **parent_names,
+			    struct clk_hw **parent_hws,
 			    u32 *mux_table, u8 num_parents, u8 id,
 			    const struct clk_range *range,
 			    int chg_pid)
 {
 	struct clk_generated *gck;
-	struct clk_init_data init;
+	struct clk_init_data init = {};
 	struct clk_hw *hw;
 	int ret;
 
+	if (!(parent_names || parent_hws))
+		return ERR_PTR(-ENOMEM);
+
 	gck = kzalloc(sizeof(*gck), GFP_KERNEL);
 	if (!gck)
 		return ERR_PTR(-ENOMEM);
 
 	init.name = name;
 	init.ops = &generated_ops;
-	init.parent_names = parent_names;
+	if (parent_hws)
+		init.parent_hws = (const struct clk_hw **)parent_hws;
+	else
+		init.parent_names = parent_names;
 	init.num_parents = num_parents;
 	init.flags = CLK_SET_RATE_GATE | CLK_SET_PARENT_GATE;
 	if (chg_pid >= 0)

drivers/clk/at91/dt-compat.c

@@ -171,7 +171,7 @@ static void __init of_sama5d2_clk_generated_setup(struct device_node *np)
 
 		hw = at91_clk_register_generated(regmap, &pmc_pcr_lock,
 						 &dt_pcr_layout, name,
-						 parent_names, NULL,
+						 parent_names, NULL, NULL,
 						 num_parents, id, &range,
 						 chg_pid);
 		if (IS_ERR(hw))

drivers/clk/at91/pmc.h

@@ -144,7 +144,8 @@ struct clk_hw * __init
 at91_clk_register_generated(struct regmap *regmap, spinlock_t *lock,
 			    const struct clk_pcr_layout *layout,
 			    const char *name, const char **parent_names,
-			    u32 *mux_table, u8 num_parents, u8 id,
+			    struct clk_hw **parent_hws, u32 *mux_table,
+			    u8 num_parents, u8 id,
 			    const struct clk_range *range, int chg_pid);
 
 struct clk_hw * __init

drivers/clk/at91/sam9x60.c

@@ -351,7 +351,7 @@ static void __init sam9x60_pmc_setup(struct device_node *np)
 		hw = at91_clk_register_generated(regmap, &pmc_pcr_lock,
 						 &sam9x60_pcr_layout,
 						 sam9x60_gck[i].n,
-						 parent_names, NULL, 6,
+						 parent_names, NULL, NULL, 6,
 						 sam9x60_gck[i].id,
 						 &sam9x60_gck[i].r, INT_MIN);
 		if (IS_ERR(hw))

drivers/clk/at91/sama5d2.c

@@ -358,7 +358,7 @@ static void __init sama5d2_pmc_setup(struct device_node *np)
 		hw = at91_clk_register_generated(regmap, &pmc_pcr_lock,
 						 &sama5d2_pcr_layout,
 						 sama5d2_gck[i].n,
-						 parent_names, NULL, 6,
+						 parent_names, NULL, NULL, 6,
 						 sama5d2_gck[i].id,
 						 &sama5d2_gck[i].r,
 						 sama5d2_gck[i].chg_pid);

drivers/clk/at91/sama7g5.c

@@ -1111,7 +1111,7 @@ static void __init sama7g5_pmc_setup(struct device_node *np)
 		hw = at91_clk_register_generated(regmap, &pmc_pcr_lock,
 						 &sama7g5_pcr_layout,
 						 sama7g5_gck[i].n,
-						 parent_names, mux_table,
+						 parent_names, NULL, mux_table,
 						 num_parents,
 						 sama7g5_gck[i].id,
 						 &sama7g5_gck[i].r,