[RESEND PATCH v2 05/13] drivers: clk: st: Handle clk synchronous mode for video clocks

Gabriel Fernandez
2016-06-16T09:20:25Z

This patch configures the semi-synchronous mode of the video clocks
of clkgenD2.

Signed-off-by: Olivier Bideau <olivier.bideau@st.com>
Signed-off-by: Gabriel Fernandez <gabriel.fernandez@linaro.org>
---
.../devicetree/bindings/clock/st/st,flexgen.txt | 2 ++
drivers/clk/st/clk-flexgen.c | 37 ++++++++++++++++++++--
2 files changed, 37 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/clock/st/st,flexgen.txt b/Documentation/devicetree/bindings/clock/st/st,flexgen.txt
index d68f6a5f..7ff77fc 100644
--- a/Documentation/devicetree/bindings/clock/st/st,flexgen.txt
+++ b/Documentation/devicetree/bindings/clock/st/st,flexgen.txt
@@ -62,6 +62,8 @@ Required properties:
"st,flexgen"
"st,flexgen-audio", "st,flexgen" (enable clock propagation on parent for
audio use case)
+ "st,flexgen-video", "st,flexgen" (enable clock propagation on parent
+ and activate synchronous mode)

- #clock-cells : from common clock binding; shall be set to 1 (multiple clock
outputs).
diff --git a/drivers/clk/st/clk-flexgen.c b/drivers/clk/st/clk-flexgen.c
index 33d6ced..9878666 100644
--- a/drivers/clk/st/clk-flexgen.c
+++ b/drivers/clk/st/clk-flexgen.c
@@ -17,6 +17,7 @@

struct clkgen_data {
unsigned long flags;
+ bool mode;
};

struct flexgen {
@@ -32,9 +33,14 @@ struct flexgen {
struct clk_gate fgate;
/* Final divisor */
struct clk_divider fdiv;
+ /* Asynchronous mode control */
+ struct clk_gate sync;
+ /* hw control flags */
+ bool control_mode;
};

#define to_flexgen(_hw) container_of(_hw, struct flexgen, hw)
+#define to_clk_gate(_hw) container_of(_hw, struct clk_gate, hw)

static int flexgen_enable(struct clk_hw *hw)
{
@@ -143,12 +149,21 @@ static int flexgen_set_rate(struct clk_hw *hw, unsigned long rate,
struct flexgen *flexgen = to_flexgen(hw);
struct clk_hw *pdiv_hw = &flexgen->pdiv.hw;
struct clk_hw *fdiv_hw = &flexgen->fdiv.hw;
+ struct clk_hw *sync_hw = &flexgen->sync.hw;
+ struct clk_gate *config = to_clk_gate(sync_hw);
unsigned long div = 0;
int ret = 0;
+ u32 reg;

__clk_hw_set_clk(pdiv_hw, hw);
__clk_hw_set_clk(fdiv_hw, hw);

+ if (flexgen->control_mode) {
+ reg = readl(config->reg);
+ reg &= ~BIT(config->bit_idx);
+ writel(reg, config->reg);
+ }
+
div = clk_best_div(parent_rate, rate);

/*
@@ -182,7 +197,7 @@ static const struct clk_ops flexgen_ops = {
static struct clk *clk_register_flexgen(const char *name,
const char **parent_names, u8 num_parents,
void __iomem *reg, spinlock_t *lock, u32 idx,
- unsigned long flexgen_flags) {
+ unsigned long flexgen_flags, bool mode) {
struct flexgen *fgxbar;
struct clk *clk;
struct clk_init_data init;
@@ -231,6 +246,13 @@ static struct clk *clk_register_flexgen(const char *name,
fgxbar->fdiv.reg = fdiv_reg;
fgxbar->fdiv.width = 6;

+ /* Final divider sync config */
+ fgxbar->sync.lock = lock;
+ fgxbar->sync.reg = fdiv_reg;
+ fgxbar->sync.bit_idx = 7;
+
+ fgxbar->control_mode = mode;
+
fgxbar->hw.init = &init;

clk = clk_register(NULL, &fgxbar->hw);
@@ -267,11 +289,20 @@ static const struct clkgen_data clkgen_audio = {
.flags = CLK_SET_RATE_PARENT,
};

+static const struct clkgen_data clkgen_video = {
+ .flags = CLK_SET_RATE_PARENT,
+ .mode = 1,
+};
+
static const struct of_device_id flexgen_of_match[] = {
{
.compatible = "st,flexgen-audio",
.data = &clkgen_audio,
},
+ {
+ .compatible = "st,flexgen-video",
+ .data = &clkgen_video,
+ },
{}
};

@@ -287,6 +318,7 @@ static void __init st_of_flexgen_setup(struct device_node *np)
struct clkgen_data *data = NULL;
unsigned long flex_flags = 0;
int ret;
+ bool clk_mode = 0;

pnode = of_get_parent(np);
if (!pnode)
@@ -304,6 +336,7 @@ static void __init st_of_flexgen_setup(struct device_node *np)
if (match) {
data = (struct clkgen_data *)match->data;
flex_flags = data->flags;
+ clk_mode = data->mode;
}

clk_data = kzalloc(sizeof(*clk_data), GFP_KERNEL);
@@ -345,7 +378,7 @@ static void __init st_of_flexgen_setup(struct device_node *np)
continue;

clk = clk_register_flexgen(clk_name, parents, num_parents,
- reg, rlock, i, flex_flags);
+ reg, rlock, i, flex_flags, clk_mode);

if (IS_ERR(clk))
goto err;
--
1.9.1