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From:   <gabriel.fernandez@foss.st.com>
To:     Michael Turquette <mturquette@baylibre.com>,
        Stephen Boyd <sboyd@kernel.org>,
        Rob Herring <robh+dt@kernel.org>,
        Maxime Coquelin <mcoquelin.stm32@gmail.com>,
        Alexandre Torgue <alexandre.torgue@st.com>,
        Philipp Zabel <p.zabel@pengutronix.de>,
        Etienne Carriere <etienne.carriere@st.com>,
        Gabriel Fernandez <gabriel.fernandez@foss.st.com>
CC:     <linux-clk@vger.kernel.org>, <devicetree@vger.kernel.org>,
        <linux-stm32@st-md-mailman.stormreply.com>,
        <linux-arm-kernel@lists.infradead.org>,
        <linux-kernel@vger.kernel.org>
Subject: [PATCH 03/14] clk: stm32mp1: remove intermediate pll clocks
Date:   Fri, 22 Jan 2021 11:50:50 +0100
Message-ID: <20210122105101.27374-4-gabriel.fernandez@foss.st.com>
In-Reply-To: <20210122105101.27374-1-gabriel.fernandez@foss.st.com>
References: <20210122105101.27374-1-gabriel.fernandez@foss.st.com>
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From: Gabriel Fernandez <gabriel.fernandez@foss.st.com>

This patch is to prepare STM32MP1 clocks in trusted mode.
Integrate the mux clock into pll clock will facilitate to have a more
coherent clock tree in no trusted / trusted mode.

Signed-off-by: Gabriel Fernandez <gabriel.fernandez@foss.st.com>
---
 drivers/clk/clk-stm32mp1.c | 65 ++++++++++++++++++++++++--------------
 1 file changed, 42 insertions(+), 23 deletions(-)

diff --git a/drivers/clk/clk-stm32mp1.c b/drivers/clk/clk-stm32mp1.c
index 0e1d4427a8df..ee6968a2ad57 100644
--- a/drivers/clk/clk-stm32mp1.c
+++ b/drivers/clk/clk-stm32mp1.c
@@ -731,6 +731,7 @@ struct stm32_pll_obj {
 	spinlock_t *lock;
 	void __iomem *reg;
 	struct clk_hw hw;
+	struct clk_mux mux;
 };
 
 #define to_pll(_hw) container_of(_hw, struct stm32_pll_obj, hw)
@@ -745,6 +746,8 @@ struct stm32_pll_obj {
 #define FRAC_MASK	0x1FFF
 #define FRAC_SHIFT	3
 #define FRACLE		BIT(16)
+#define PLL_MUX_SHIFT	0
+#define PLL_MUX_MASK	3
 
 static int __pll_is_enabled(struct clk_hw *hw)
 {
@@ -856,16 +859,29 @@ static int pll_is_enabled(struct clk_hw *hw)
 	return ret;
 }
 
+static u8 pll_get_parent(struct clk_hw *hw)
+{
+	struct stm32_pll_obj *clk_elem = to_pll(hw);
+	struct clk_hw *mux_hw = &clk_elem->mux.hw;
+
+	__clk_hw_set_clk(mux_hw, hw);
+
+	return clk_mux_ops.get_parent(mux_hw);
+}
+
 static const struct clk_ops pll_ops = {
 	.enable		= pll_enable,
 	.disable	= pll_disable,
 	.recalc_rate	= pll_recalc_rate,
 	.is_enabled	= pll_is_enabled,
+	.get_parent	= pll_get_parent,
 };
 
 static struct clk_hw *clk_register_pll(struct device *dev, const char *name,
-				       const char *parent_name,
+				       const char * const *parent_names,
+				       int num_parents,
 				       void __iomem *reg,
+				       void __iomem *mux_reg,
 				       unsigned long flags,
 				       spinlock_t *lock)
 {
@@ -881,8 +897,15 @@ static struct clk_hw *clk_register_pll(struct device *dev, const char *name,
 	init.name = name;
 	init.ops = &pll_ops;
 	init.flags = flags;
-	init.parent_names = &parent_name;
-	init.num_parents = 1;
+	init.parent_names = parent_names;
+	init.num_parents = num_parents;
+
+	element->mux.lock = lock;
+	element->mux.reg =  mux_reg;
+	element->mux.shift = PLL_MUX_SHIFT;
+	element->mux.mask =  PLL_MUX_MASK;
+	element->mux.flags =  CLK_MUX_READ_ONLY;
+	element->mux.reg =  mux_reg;
 
 	element->hw.init = &init;
 	element->reg = reg;
@@ -1069,6 +1092,7 @@ static const struct clk_ops rtc_div_clk_ops = {
 
 struct stm32_pll_cfg {
 	u32 offset;
+	u32 muxoff;
 };
 
 static struct clk_hw *_clk_register_pll(struct device *dev,
@@ -1078,8 +1102,11 @@ static struct clk_hw *_clk_register_pll(struct device *dev,
 {
 	struct stm32_pll_cfg *stm_pll_cfg = cfg->cfg;
 
-	return clk_register_pll(dev, cfg->name, cfg->parent_name,
-				base + stm_pll_cfg->offset, cfg->flags, lock);
+	return clk_register_pll(dev, cfg->name, cfg->parent_names,
+				cfg->num_parents,
+				base + stm_pll_cfg->offset,
+				base + stm_pll_cfg->muxoff,
+				cfg->flags, lock);
 }
 
 struct stm32_cktim_cfg {
@@ -1189,14 +1216,16 @@ _clk_stm32_register_composite(struct device *dev,
 	.func		= _clk_hw_register_mux,\
 }
 
-#define PLL(_id, _name, _parent, _flags, _offset)\
+#define PLL(_id, _name, _parents, _flags, _offset_p, _offset_mux)\
 {\
 	.id		= _id,\
 	.name		= _name,\
-	.parent_name	= _parent,\
-	.flags		= _flags,\
+	.parent_names	= _parents,\
+	.num_parents	= ARRAY_SIZE(_parents),\
+	.flags		= CLK_IGNORE_UNUSED | (_flags),\
 	.cfg		=  &(struct stm32_pll_cfg) {\
-		.offset = _offset,\
+		.offset = _offset_p,\
+		.muxoff = _offset_mux,\
 	},\
 	.func		= _clk_register_pll,\
 }
@@ -1712,21 +1741,11 @@ static const struct clock_config stm32mp1_clock_cfg[] = {
 
 	FIXED_FACTOR(CK_HSE_DIV2, "clk-hse-div2", "ck_hse", 0, 1, 2),
 
-	/* ref clock pll */
-	MUX(NO_ID, "ref1", ref12_parents, CLK_OPS_PARENT_ENABLE, RCC_RCK12SELR,
-	    0, 2, CLK_MUX_READ_ONLY),
-
-	MUX(NO_ID, "ref3", ref3_parents, CLK_OPS_PARENT_ENABLE, RCC_RCK3SELR,
-	    0, 2, CLK_MUX_READ_ONLY),
-
-	MUX(NO_ID, "ref4", ref4_parents, CLK_OPS_PARENT_ENABLE, RCC_RCK4SELR,
-	    0, 2, CLK_MUX_READ_ONLY),
-
 	/* PLLs */
-	PLL(PLL1, "pll1", "ref1", CLK_IGNORE_UNUSED, RCC_PLL1CR),
-	PLL(PLL2, "pll2", "ref1", CLK_IGNORE_UNUSED, RCC_PLL2CR),
-	PLL(PLL3, "pll3", "ref3", CLK_IGNORE_UNUSED, RCC_PLL3CR),
-	PLL(PLL4, "pll4", "ref4", CLK_IGNORE_UNUSED, RCC_PLL4CR),
+	PLL(PLL1, "pll1", ref12_parents, 0, RCC_PLL1CR, RCC_RCK12SELR),
+	PLL(PLL2, "pll2", ref12_parents, 0, RCC_PLL2CR, RCC_RCK12SELR),
+	PLL(PLL3, "pll3", ref3_parents, 0, RCC_PLL3CR, RCC_RCK3SELR),
+	PLL(PLL4, "pll4", ref4_parents, 0, RCC_PLL4CR, RCC_RCK4SELR),
 
 	/* ODF */
 	COMPOSITE(PLL1_P, "pll1_p", PARENT("pll1"), 0,
-- 
2.17.1