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clk: stm32f4: Add lcd-tft clock

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This patch introduces lcd-tft clock for stm32f4 soc.

Signed-off-by: Gabriel Fernandez <gabriel.fernandez@st.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
This commit is contained in:
Gabriel Fernandez 2016-12-13 15:20:15 +01:00 committed by Stephen Boyd
parent 517633ef63
commit daf2d117cb
1 changed files with 114 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

114
drivers/clk/clk-stm32f4.c
View file

@ -51,6 +51,8 @@
#define NONE -1
#define NO_IDX NONE
#define NO_MUX NONE
#define NO_GATE NONE
struct stm32f4_gate_data {
u8 offset;
@ -942,11 +944,37 @@ static const char *rtc_parents[4] = {
"no-clock", "lse", "lsi", "hse-rtc"
};
static const char *lcd_parent[1] = { "pllsai-r-div" };
struct stm32_aux_clk {
int idx;
const char *name;
const char * const *parent_names;
int num_parents;
int offset_mux;
u8 shift;
u8 mask;
int offset_gate;
u8 bit_idx;
unsigned long flags;
};
struct stm32f4_clk_data {
const struct stm32f4_gate_data *gates_data;
const u64 *gates_map;
int gates_num;
const struct stm32f4_pll_data *pll_data;
const struct stm32_aux_clk *aux_clk;
int aux_clk_num;
};
static const struct stm32_aux_clk stm32f429_aux_clk[] = {
{
CLK_LCD, "lcd-tft", lcd_parent, ARRAY_SIZE(lcd_parent),
NO_MUX, 0, 0,
STM32F4_RCC_APB2ENR, 26,
CLK_SET_RATE_PARENT
},
};
static const struct stm32f4_clk_data stm32f429_clk_data = {
@ -954,6 +982,8 @@ static const struct stm32f4_clk_data stm32f429_clk_data = {
.gates_map = stm32f42xx_gate_map,
.gates_num = ARRAY_SIZE(stm32f429_gates),
.pll_data = stm32f429_pll,
.aux_clk = stm32f429_aux_clk,
.aux_clk_num = ARRAY_SIZE(stm32f429_aux_clk),
};
static const struct stm32f4_clk_data stm32f469_clk_data = {
@ -961,6 +991,8 @@ static const struct stm32f4_clk_data stm32f469_clk_data = {
.gates_map = stm32f46xx_gate_map,
.gates_num = ARRAY_SIZE(stm32f469_gates),
.pll_data = stm32f469_pll,
.aux_clk = stm32f429_aux_clk,
.aux_clk_num = ARRAY_SIZE(stm32f429_aux_clk),
};
static const struct of_device_id stm32f4_of_match[] = {
@ -975,6 +1007,66 @@ static const struct of_device_id stm32f4_of_match[] = {
{}
};
static struct clk_hw *stm32_register_aux_clk(const char *name,
const char * const *parent_names, int num_parents,
int offset_mux, u8 shift, u8 mask,
int offset_gate, u8 bit_idx,
unsigned long flags, spinlock_t *lock)
{
struct clk_hw *hw;
struct clk_gate *gate;
struct clk_mux *mux = NULL;
struct clk_hw *mux_hw = NULL, *gate_hw = NULL;
const struct clk_ops *mux_ops = NULL, *gate_ops = NULL;
if (offset_gate != NO_GATE) {
gate = kzalloc(sizeof(*gate), GFP_KERNEL);
if (!gate) {
hw = ERR_PTR(-EINVAL);
goto fail;
}
gate->reg = base + offset_gate;
gate->bit_idx = bit_idx;
gate->flags = 0;
gate->lock = lock;
gate_hw = &gate->hw;
gate_ops = &clk_gate_ops;
}
if (offset_mux != NO_MUX) {
mux = kzalloc(sizeof(*mux), GFP_KERNEL);
if (!mux) {
kfree(gate);
hw = ERR_PTR(-EINVAL);
goto fail;
}
mux->reg = base + offset_mux;
mux->shift = shift;
mux->mask = mask;
mux->flags = 0;
mux_hw = &mux->hw;
mux_ops = &clk_mux_ops;
}
if (mux_hw == NULL && gate_hw == NULL)
return ERR_PTR(-EINVAL);
hw = clk_hw_register_composite(NULL, name, parent_names, num_parents,
mux_hw, mux_ops,
NULL, NULL,
gate_hw, gate_ops,
flags);
if (IS_ERR(hw)) {
kfree(gate);
kfree(mux);
}
fail:
return hw;
}
static void __init stm32f4_rcc_init(struct device_node *np)
{
const char *hse_clk;
@ -1134,6 +1226,28 @@ static void __init stm32f4_rcc_init(struct device_node *np)
goto fail;
}
for (n = 0; n < data->aux_clk_num; n++) {
const struct stm32_aux_clk *aux_clk;
struct clk_hw *hw;
aux_clk = &data->aux_clk[n];
hw = stm32_register_aux_clk(aux_clk->name,
aux_clk->parent_names, aux_clk->num_parents,
aux_clk->offset_mux, aux_clk->shift,
aux_clk->mask, aux_clk->offset_gate,
aux_clk->bit_idx, aux_clk->flags,
&stm32f4_clk_lock);
if (IS_ERR(hw)) {
pr_warn("Unable to register %s clk\n", aux_clk->name);
continue;
}
if (aux_clk->idx != NO_IDX)
clks[aux_clk->idx] = hw;
}
of_clk_add_hw_provider(np, stm32f4_rcc_lookup_clk, NULL);
return;
fail: