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drivers: clk: st: Handle clk synchronous mode for video clocks 

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@st.com>
Acked-by: Peter Griffin <peter.griffin@linaro.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
This commit is contained in:
Gabriel Fernandez 2016-08-29 14:26:58 +02:00 committed by Stephen Boyd
parent 26bd0a5775
commit cb80ec768a
2 changed files with 37 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
Documentation/devicetree/bindings/clock/st/st,flexgen.txt
View File

@ -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).

37
drivers/clk/st/clk-flexgen.c
View File

@ -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);
@ -347,7 +380,7 @@ 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;