[PATCH v2 6/9] clk: renesas: rzg2l: Add support for RZ/G3L DSI mux

[Biju]

From: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>

Add support for RZ/G3L DSI mux that supports 2 duty cycles.

Signed-off-by: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>
---
v1->v2:
 * Dropped rzg3l_cpg_dsi_smux_get_duty_cycle().
 * Updated Mux flags with CLK_DUTY_CYCLE_PARENT and
   CLK_SET_RATE_NO_REPARENT
 * Determine rate now forward to clk_mux_ops.determine_rate().
 * Dropped the duty cycle macros.
 * Dropped struct rzg3l_dsi_mux_clk and to_plldsi_clk_mux.
---
 drivers/clk/renesas/rzg2l-cpg.c | 84 +++++++++++++++++++++++++++++++++
 drivers/clk/renesas/rzg2l-cpg.h | 10 ++++
 2 files changed, 94 insertions(+)

diff --git a/drivers/clk/renesas/rzg2l-cpg.c b/drivers/clk/renesas/rzg2l-cpg.c
index d3d4e618466c..33cfea1b798a 100644
--- a/drivers/clk/renesas/rzg2l-cpg.c
+++ b/drivers/clk/renesas/rzg2l-cpg.c
@@ -1493,6 +1493,87 @@ static const struct clk_ops rzg3l_cpg_pll_ops = {
 	.recalc_rate = rzg3s_cpg_pll_clk_recalc_rate,
 };
 
+static u8 rzg3l_cpg_dsi_smux_get_parent(struct clk_hw *hw)
+{
+	return clk_mux_ops.get_parent(hw);
+}
+
+static int rzg3l_cpg_dsi_smux_set_parent(struct clk_hw *hw, u8 index)
+{
+	return clk_mux_ops.set_parent(hw, index);
+}
+
+static int rzg3l_cpg_dsi_smux_determine_rate(struct clk_hw *hw,
+					     struct clk_rate_request *req)
+{
+	return clk_mux_ops.determine_rate(hw, req);
+}
+
+static int rzg3l_cpg_dsi_smux_set_duty_cycle(struct clk_hw *hw,
+					     struct clk_duty *duty)
+{
+	struct clk_hw *parent_hw;
+	u8 parent_idx;
+
+	/*
+	 * Select parent based on requested duty cycle:
+	 * - If duty > 50% (num/den > 1/2), select LVDS path (parent 0)
+	 * - Otherwise, select DSI/RGB path (parent 1)
+	 */
+	if (duty->num * 2 > duty->den)
+		parent_idx = 0;
+	else
+		parent_idx = 1;
+
+	if (parent_idx >= clk_hw_get_num_parents(hw))
+		return -EINVAL;
+
+	parent_hw = clk_hw_get_parent_by_index(hw, parent_idx);
+	if (!parent_hw)
+		return -EINVAL;
+
+	return clk_hw_set_parent(hw, parent_hw);
+}
+
+static const struct clk_ops rzg3l_cpg_dsi_smux_ops = {
+	.determine_rate = rzg3l_cpg_dsi_smux_determine_rate,
+	.get_parent = rzg3l_cpg_dsi_smux_get_parent,
+	.set_parent = rzg3l_cpg_dsi_smux_set_parent,
+	.set_duty_cycle = rzg3l_cpg_dsi_smux_set_duty_cycle,
+};
+
+static struct clk * __init
+rzg3l_cpg_dsi_mux_clk_register(const struct cpg_core_clk *core,
+			       struct rzg2l_cpg_priv *priv)
+{
+	struct clk_mux *mux_data;
+	struct clk_init_data init;
+	int ret;
+
+	mux_data = devm_kzalloc(priv->dev, sizeof(*mux_data), GFP_KERNEL);
+	if (!mux_data)
+		return ERR_PTR(-ENOMEM);
+
+	init.name = core->name;
+	init.ops = &rzg3l_cpg_dsi_smux_ops;
+	init.flags = core->core_flags | CLK_SET_RATE_PARENT;
+	init.parent_names = core->parent_names;
+	init.num_parents = core->num_parents;
+
+	mux_data->reg = priv->base + GET_REG_OFFSET(core->conf);
+	mux_data->shift = GET_SHIFT(core->conf);
+	mux_data->mask = clk_div_mask(GET_WIDTH(core->conf));
+	mux_data->flags = core->mux_flags;
+	mux_data->lock = &priv->rmw_lock;
+	mux_data->hw.init = &init;
+
+	ret = devm_clk_hw_register(priv->dev, &mux_data->hw);
+	if (ret)
+		return ERR_PTR(ret);
+
+	return mux_data->hw.clk;
+}
+
 static inline bool
 rzg3l_dsi_compute_pll_parameters(struct rzg3l_plldsi_parameters *pars,
 				 struct rzg3l_plldsi_parameters *p,
@@ -1805,6 +1886,9 @@ rzg2l_cpg_register_core_clk(const struct cpg_core_clk *core,
 	case CLK_TYPE_G3L_PLLDSI:
 		clk = rzg2l_cpg_pll_clk_register(core, priv, &rzg3l_cpg_plldsi_ops);
 		break;
+	case CLK_TYPE_G3L_DSI_MUX:
+		clk = rzg3l_cpg_dsi_mux_clk_register(core, priv);
+		break;
 	default:
 		goto fail;
 	}
diff --git a/drivers/clk/renesas/rzg2l-cpg.h b/drivers/clk/renesas/rzg2l-cpg.h
index 22cca4795301..1591fce2a329 100644
--- a/drivers/clk/renesas/rzg2l-cpg.h
+++ b/drivers/clk/renesas/rzg2l-cpg.h
@@ -151,6 +151,9 @@ enum clk_types {
 
 	/* Clock for G3L LVDS divider */
 	CLK_TYPE_G3L_LVDS_DIV,
+
+	/* Clock for G3L DSI clock source selector */
+	CLK_TYPE_G3L_DSI_MUX,
 };
 
 #define DEF_TYPE(_name, _id, _type...) \
@@ -204,6 +207,13 @@ enum clk_types {
 		 .parent_names = _parent_names, \
 		 .num_parents = ARRAY_SIZE(_parent_names), \
 		 .mux_flags = CLK_MUX_READ_ONLY)
+#define DEF_G3L_SEL_DSI_MUX(_name, _id, _conf, _parent_names) \
+	DEF_TYPE(_name, _id, CLK_TYPE_G3L_DSI_MUX, .conf = _conf, \
+		 .parent_names = _parent_names, \
+		 .num_parents = ARRAY_SIZE(_parent_names), \
+		 .core_flags = CLK_SET_RATE_PARENT | CLK_DUTY_CYCLE_PARENT | \
+			       CLK_SET_RATE_NO_REPARENT, \
+		 .mux_flags = CLK_MUX_HIWORD_MASK)
 #define DEF_SD_MUX(_name, _id, _conf, _sconf, _parent_names, _mtable, _clk_flags, _notifier) \
 	DEF_TYPE(_name, _id, CLK_TYPE_SD_MUX, .conf = _conf, .sconf = _sconf, \
 		 .parent_names = _parent_names, \
-- 
2.43.0