[PATCH 15/37] clk: renesas: rzg2l: add support for RZ/G3S PLL

[Claudiu <claudiu.beznea@xxxxxxxxx>]

From: Claudiu Beznea <claudiu.beznea.uj@xxxxxxxxxxxxxx>

Add support for reading the frequency of PLL1/4/6 available on RZ/G3S.
The computation formula for PLL frequency is as follows:
Fout = (nir + nfr / 4096) * Fin / (mr * pr)

Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@xxxxxxxxxxxxxx>
---
 drivers/clk/renesas/rzg2l-cpg.c | 44 ++++++++++++++++++++++++++++++---
 drivers/clk/renesas/rzg2l-cpg.h |  3 +++
 2 files changed, 43 insertions(+), 4 deletions(-)

diff --git a/drivers/clk/renesas/rzg2l-cpg.c b/drivers/clk/renesas/rzg2l-cpg.c
index 50f69bbe1a6e..638501e493e2 100644
--- a/drivers/clk/renesas/rzg2l-cpg.c
+++ b/drivers/clk/renesas/rzg2l-cpg.c
@@ -718,11 +718,43 @@ static const struct clk_ops rzg2l_cpg_pll_ops = {
 	.recalc_rate = rzg2l_cpg_pll_clk_recalc_rate,
 };
 
+static unsigned long rzg3s_cpg_pll_clk_recalc_rate(struct clk_hw *hw,
+						   unsigned long parent_rate)
+{
+	struct pll_clk *pll_clk = to_pll(hw);
+	struct rzg2l_cpg_priv *priv = pll_clk->priv;
+	u32 nir, nfr, mr, pr, val;
+	u64 rate;
+
+	if (pll_clk->type != CLK_TYPE_G3S_SAM_PLL)
+		return parent_rate;
+
+	val = readl(priv->base + GET_REG_SAMPLL_CLK1(pll_clk->conf));
+
+	pr = 1 << FIELD_GET(GENMASK(28, 26), val);
+	/* Hardware interprets values higher than 8 as p = 16. */
+	if (pr > 8)
+		pr = 16;
+
+	mr  = FIELD_GET(GENMASK(25, 22), val) + 1;
+	nir = FIELD_GET(GENMASK(21, 13), val) + 1;
+	nfr = FIELD_GET(GENMASK(12, 1), val);
+
+	rate = DIV_ROUND_CLOSEST_ULL((u64)parent_rate * nfr, 4096);
+	rate += (u64)parent_rate * nir;
+	return DIV_ROUND_CLOSEST_ULL(rate, (mr + pr));
+}
+
+static const struct clk_ops rzg3s_cpg_pll_ops = {
+	.recalc_rate = rzg3s_cpg_pll_clk_recalc_rate,
+};
+
 static struct clk * __init
 rzg2l_cpg_pll_clk_register(const struct cpg_core_clk *core,
 			   struct clk **clks,
 			   void __iomem *base,
-			   struct rzg2l_cpg_priv *priv)
+			   struct rzg2l_cpg_priv *priv,
+			   const struct clk_ops *ops)
 {
 	struct device *dev = priv->dev;
 	const struct clk *parent;
@@ -740,7 +772,7 @@ rzg2l_cpg_pll_clk_register(const struct cpg_core_clk *core,
 
 	parent_name = __clk_get_name(parent);
 	init.name = core->name;
-	init.ops = &rzg2l_cpg_pll_ops;
+	init.ops = ops;
 	init.flags = 0;
 	init.parent_names = &parent_name;
 	init.num_parents = 1;
@@ -835,8 +867,12 @@ rzg2l_cpg_register_core_clk(const struct cpg_core_clk *core,
 						core->mult, div);
 		break;
 	case CLK_TYPE_SAM_PLL:
-		clk = rzg2l_cpg_pll_clk_register(core, priv->clks,
-						 priv->base, priv);
+		clk = rzg2l_cpg_pll_clk_register(core, priv->clks, priv->base, priv,
+						 &rzg2l_cpg_pll_ops);
+		break;
+	case CLK_TYPE_G3S_SAM_PLL:
+		clk = rzg2l_cpg_pll_clk_register(core, priv->clks, priv->base, priv,
+						 &rzg3s_cpg_pll_ops);
 		break;
 	case CLK_TYPE_SIPLL5:
 		clk = rzg2l_cpg_sipll5_register(core, priv->clks, priv);
diff --git a/drivers/clk/renesas/rzg2l-cpg.h b/drivers/clk/renesas/rzg2l-cpg.h
index 0b28870a6f9d..16f7a1872814 100644
--- a/drivers/clk/renesas/rzg2l-cpg.h
+++ b/drivers/clk/renesas/rzg2l-cpg.h
@@ -102,6 +102,7 @@ enum clk_types {
 	CLK_TYPE_IN,		/* External Clock Input */
 	CLK_TYPE_FF,		/* Fixed Factor Clock */
 	CLK_TYPE_SAM_PLL,
+	CLK_TYPE_G3S_SAM_PLL,
 
 	/* Clock with divider */
 	CLK_TYPE_DIV,
@@ -129,6 +130,8 @@ enum clk_types {
 	DEF_TYPE(_name, _id, _type, .parent = _parent)
 #define DEF_SAMPLL(_name, _id, _parent, _conf) \
 	DEF_TYPE(_name, _id, CLK_TYPE_SAM_PLL, .parent = _parent, .conf = _conf)
+#define DEF_G3S_SAMPLL(_name, _id, _parent, _conf) \
+	DEF_TYPE(_name, _id, CLK_TYPE_G3S_SAM_PLL, .parent = _parent, .conf = _conf)
 #define DEF_INPUT(_name, _id) \
 	DEF_TYPE(_name, _id, CLK_TYPE_IN)
 #define DEF_FIXED(_name, _id, _parent, _mult, _div) \
-- 
2.39.2