From: Gabriel Fernandez <gabriel.fernan...@st.com>

This patch introduces lcd-tft clock for stm32f4 soc.

Signed-off-by: Gabriel Fernandez <gabriel.fernan...@st.com>
---
 drivers/clk/clk-stm32f4.c | 117 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 117 insertions(+)

diff --git a/drivers/clk/clk-stm32f4.c b/drivers/clk/clk-stm32f4.c
index 98856ac..86244fc 100644
--- a/drivers/clk/clk-stm32f4.c
+++ b/drivers/clk/clk-stm32f4.c
@@ -933,11 +933,42 @@ static struct clk_hw *stm32_register_cclk(struct device 
*dev, const char *name,
        "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;
+};
+
+#define NONE -1
+#define NO_IDX  NONE
+#define NO_MUX  NONE
+#define NO_GATE NONE
+
+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 = {
@@ -945,6 +976,8 @@ struct stm32f4_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 = {
@@ -952,6 +985,8 @@ struct stm32f4_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[] = {
@@ -966,6 +1001,66 @@ struct stm32f4_clk_data {
        {}
 };
 
+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;
@@ -1121,6 +1216,28 @@ 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:
-- 
1.9.1

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