[PATCH v3 1/2] driver: clk: tegra: partially support PLL clocks

[Svyatoslav Ryhel]

Return PLL id into struct clk if PLL is parsed from device
tree instead of throwing an error. Allow requesting PLL
clock rate via get_rate op.

Signed-off-by: Svyatoslav Ryhel <clamor95 at gmail.com>
---
 drivers/clk/tegra/tegra-car-clk.c | 47 +++++++++++++++++++++++++------
 1 file changed, 38 insertions(+), 9 deletions(-)

diff --git a/drivers/clk/tegra/tegra-car-clk.c b/drivers/clk/tegra/tegra-car-clk.c
index 1d61f8dc378..ec89d4b2b2d 100644
--- a/drivers/clk/tegra/tegra-car-clk.c
+++ b/drivers/clk/tegra/tegra-car-clk.c
@@ -10,6 +10,9 @@
 #include <asm/arch/clock.h>
 #include <asm/arch-tegra/clk_rst.h>
 
+#define TEGRA_CAR_CLK_PLL	BIT(0)
+#define TEGRA_CAR_CLK_PERIPH	BIT(1)
+
 static int tegra_car_clk_request(struct clk *clk)
 {
 	debug("%s(clk=%p) (dev=%p, id=%lu)\n", __func__, clk, clk->dev,
@@ -20,24 +23,41 @@ static int tegra_car_clk_request(struct clk *clk)
 	 * varies per SoC) are the peripheral clocks, which use a numbering
 	 * scheme that matches HW registers 1:1. There are other clock IDs
 	 * beyond this that are assigned arbitrarily by the Tegra CAR DT
-	 * binding. Due to the implementation of this driver, it currently
-	 * only supports the peripheral IDs.
+	 * binding.
 	 */
-	if (clk->id >= PERIPH_ID_COUNT)
-		return -EINVAL;
+	if (clk->id < PERIPH_ID_COUNT) {
+		clk->data |= TEGRA_CAR_CLK_PERIPH;
+		return 0;
+	}
 
-	return 0;
+	/* If check for periph failed, then check for PLL clock id */
+	int id = clk_id_to_pll_id(clk->id);
+
+	if (clock_id_is_pll(id)) {
+		clk->id = id;
+		clk->data |= TEGRA_CAR_CLK_PLL;
+		return 0;
+	}
+
+	return -EINVAL;
 }
 
 static ulong tegra_car_clk_get_rate(struct clk *clk)
 {
-	enum clock_id parent;
-
 	debug("%s(clk=%p) (dev=%p, id=%lu)\n", __func__, clk, clk->dev,
 	      clk->id);
 
-	parent = clock_get_periph_parent(clk->id);
-	return clock_get_periph_rate(clk->id, parent);
+	if (clk->data & TEGRA_CAR_CLK_PLL)
+		return clock_get_rate(clk->id);
+
+	if (clk->data & TEGRA_CAR_CLK_PERIPH) {
+		enum clock_id parent;
+
+		parent = clock_get_periph_parent(clk->id);
+		return clock_get_periph_rate(clk->id, parent);
+	}
+
+	return -1U;
 }
 
 static ulong tegra_car_clk_set_rate(struct clk *clk, ulong rate)
@@ -47,6 +67,9 @@ static ulong tegra_car_clk_set_rate(struct clk *clk, ulong rate)
 	debug("%s(clk=%p, rate=%lu) (dev=%p, id=%lu)\n", __func__, clk, rate,
 	      clk->dev, clk->id);
 
+	if (clk->data & TEGRA_CAR_CLK_PLL)
+		return 0;
+
 	parent = clock_get_periph_parent(clk->id);
 	return clock_adjust_periph_pll_div(clk->id, parent, rate, NULL);
 }
@@ -56,6 +79,9 @@ static int tegra_car_clk_enable(struct clk *clk)
 	debug("%s(clk=%p) (dev=%p, id=%lu)\n", __func__, clk, clk->dev,
 	      clk->id);
 
+	if (clk->data & TEGRA_CAR_CLK_PLL)
+		return 0;
+
 	clock_enable(clk->id);
 
 	return 0;
@@ -66,6 +92,9 @@ static int tegra_car_clk_disable(struct clk *clk)
 	debug("%s(clk=%p) (dev=%p, id=%lu)\n", __func__, clk, clk->dev,
 	      clk->id);
 
+	if (clk->data & TEGRA_CAR_CLK_PLL)
+		return 0;
+
 	clock_disable(clk->id);
 
 	return 0;
-- 
2.43.0