clk: at91: clk-sam9x60-pll: re-factor to support plls with multiple outputs

Some of the SAMA7G5 PLLs support multiple outputs (e.g. AUDIO PLL).
For these, split the PLL clock in two: fractional clock and
divider clock. In case PLLs supports multiple outputs (since these
outputs are dividers (with different settings) sharing the same
fractional part), it will register one fractional clock and multiple
divider clocks (dividers sharing the fractional clock).

Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Link: https://lore.kernel.org/r/1595403506-8209-17-git-send-email-claudiu.beznea@microchip.com
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

1 files changed, 41 insertions, 9 deletions

diff --git a/drivers/clk/at91/sam9x60.c b/drivers/clk/at91/sam9x60.c
index d8d4b28ec4cb..ab6318c0589e 100644
--- a/drivers/clk/at91/sam9x60.c
+++ b/drivers/clk/at91/sam9x60.c
@@ -42,6 +42,20 @@ static const struct clk_pll_characteristics upll_characteristics = {
 	.upll = true,
 };
 
+static const struct clk_pll_layout pll_frac_layout = {
+	.mul_mask = GENMASK(31, 24),
+	.frac_mask = GENMASK(21, 0),
+	.mul_shift = 24,
+	.frac_shift = 0,
+};
+
+static const struct clk_pll_layout pll_div_layout = {
+	.div_mask = GENMASK(7, 0),
+	.endiv_mask = BIT(29),
+	.div_shift = 0,
+	.endiv_shift = 29,
+};
+
 static const struct clk_programmable_layout sam9x60_programmable_layout = {
 	.pres_mask = 0xff,
 	.pres_shift = 8,
@@ -156,6 +170,7 @@ static void __init sam9x60_pmc_setup(struct device_node *np)
 	const char *td_slck_name, *md_slck_name, *mainxtal_name;
 	struct pmc_data *sam9x60_pmc;
 	const char *parent_names[6];
+	struct clk_hw *main_osc_hw;
 	struct regmap *regmap;
 	struct clk_hw *hw;
 	int i;
@@ -200,6 +215,7 @@ static void __init sam9x60_pmc_setup(struct device_node *np)
 					bypass);
 	if (IS_ERR(hw))
 		goto err_free;
+	main_osc_hw = hw;
 
 	parent_names[0] = "main_rc_osc";
 	parent_names[1] = "main_osc";
@@ -209,15 +225,31 @@ static void __init sam9x60_pmc_setup(struct device_node *np)
 
 	sam9x60_pmc->chws[PMC_MAIN] = hw;
 
-	hw = sam9x60_clk_register_pll(regmap, &pmc_pll_lock, "pllack",
-				      "mainck", 0, &plla_characteristics);
+	hw = sam9x60_clk_register_frac_pll(regmap, &pmc_pll_lock, "pllack_fracck",
+					   "mainck", sam9x60_pmc->chws[PMC_MAIN],
+					   0, &plla_characteristics,
+					   &pll_frac_layout, true);
+	if (IS_ERR(hw))
+		goto err_free;
+
+	hw = sam9x60_clk_register_div_pll(regmap, &pmc_pll_lock, "pllack_divck",
+					  "pllack_fracck", 0, &plla_characteristics,
+					  &pll_div_layout, true);
 	if (IS_ERR(hw))
 		goto err_free;
 
 	sam9x60_pmc->chws[PMC_PLLACK] = hw;
 
-	hw = sam9x60_clk_register_pll(regmap, &pmc_pll_lock, "upllck",
-				      "main_osc", 1, &upll_characteristics);
+	hw = sam9x60_clk_register_frac_pll(regmap, &pmc_pll_lock, "upllck_fracck",
+					   "main_osc", main_osc_hw, 1,
+					   &upll_characteristics,
+					   &pll_frac_layout, false);
+	if (IS_ERR(hw))
+		goto err_free;
+
+	hw = sam9x60_clk_register_div_pll(regmap, &pmc_pll_lock, "upllck_divck",
+					  "upllck_fracck", 1, &upll_characteristics,
+					  &pll_div_layout, false);
 	if (IS_ERR(hw))
 		goto err_free;
 
@@ -225,7 +257,7 @@ static void __init sam9x60_pmc_setup(struct device_node *np)
 
 	parent_names[0] = md_slck_name;
 	parent_names[1] = "mainck";
-	parent_names[2] = "pllack";
+	parent_names[2] = "pllack_divck";
 	hw = at91_clk_register_master(regmap, "masterck", 3, parent_names,
 				      &sam9x60_master_layout,
 				      &mck_characteristics);
@@ -234,8 +266,8 @@ static void __init sam9x60_pmc_setup(struct device_node *np)
 
 	sam9x60_pmc->chws[PMC_MCK] = hw;
 
-	parent_names[0] = "pllack";
-	parent_names[1] = "upllck";
+	parent_names[0] = "pllack_divck";
+	parent_names[1] = "upllck_divck";
 	parent_names[2] = "main_osc";
 	hw = sam9x60_clk_register_usb(regmap, "usbck", parent_names, 3);
 	if (IS_ERR(hw))
@@ -245,8 +277,8 @@ static void __init sam9x60_pmc_setup(struct device_node *np)
 	parent_names[1] = td_slck_name;
 	parent_names[2] = "mainck";
 	parent_names[3] = "masterck";
-	parent_names[4] = "pllack";
-	parent_names[5] = "upllck";
+	parent_names[4] = "pllack_divck";
+	parent_names[5] = "upllck_divck";
 	for (i = 0; i < 8; i++) {
 		char name[6];