linux-kernel - [PATCH v7 5/7] clk: starfive: jh7110-sys: Add PLL clocks source from DTS

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Date:   Mon, 17 Jul 2023 10:30:38 +0800
From:   Xingyu Wu <xingyu.wu@...rfivetech.com>
To:     <linux-riscv@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        "Michael Turquette" <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        "Rob Herring" <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Conor Dooley <conor@...nel.org>,
        Emil Renner Berthing <emil.renner.berthing@...onical.com>
CC:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Hal Feng <hal.feng@...rfivetech.com>,
        Xingyu Wu <xingyu.wu@...rfivetech.com>,
        "William Qiu" <william.qiu@...rfivetech.com>,
        <linux-kernel@...r.kernel.org>, <linux-clk@...r.kernel.org>
Subject: [PATCH v7 5/7] clk: starfive: jh7110-sys: Add PLL clocks source from DTS

Modify PLL clocks source to be got from DTS or
the fixed factor clocks.

Signed-off-by: Xingyu Wu <xingyu.wu@...rfivetech.com>
---
 drivers/clk/starfive/Kconfig                  |  1 +
 .../clk/starfive/clk-starfive-jh7110-sys.c    | 66 ++++++++++++-------
 2 files changed, 45 insertions(+), 22 deletions(-)

diff --git a/drivers/clk/starfive/Kconfig b/drivers/clk/starfive/Kconfig
index 5195f7be5213..978b78ec08b1 100644
--- a/drivers/clk/starfive/Kconfig
+++ b/drivers/clk/starfive/Kconfig
@@ -35,6 +35,7 @@ config CLK_STARFIVE_JH7110_SYS
 	select AUXILIARY_BUS
 	select CLK_STARFIVE_JH71X0
 	select RESET_STARFIVE_JH7110 if RESET_CONTROLLER
+	select CLK_STARFIVE_JH7110_PLL
 	default ARCH_STARFIVE
 	help
 	  Say yes here to support the system clock controller on the
diff --git a/drivers/clk/starfive/clk-starfive-jh7110-sys.c b/drivers/clk/starfive/clk-starfive-jh7110-sys.c
index e6031345ef05..3884eff9fe93 100644
--- a/drivers/clk/starfive/clk-starfive-jh7110-sys.c
+++ b/drivers/clk/starfive/clk-starfive-jh7110-sys.c
@@ -7,6 +7,7 @@
  */
 
 #include <linux/auxiliary_bus.h>
+#include <linux/clk.h>
 #include <linux/clk-provider.h>
 #include <linux/init.h>
 #include <linux/io.h>
@@ -389,6 +390,7 @@ static int __init jh7110_syscrg_probe(struct platform_device *pdev)
 	struct jh71x0_clk_priv *priv;
 	unsigned int idx;
 	int ret;
+	struct clk *pllclk;
 
 	priv = devm_kzalloc(&pdev->dev,
 			    struct_size(priv, reg, JH7110_SYSCLK_END),
@@ -402,28 +404,42 @@ static int __init jh7110_syscrg_probe(struct platform_device *pdev)
 	if (IS_ERR(priv->base))
 		return PTR_ERR(priv->base);
 
-	/*
-	 * These PLL clocks are not actually fixed factor clocks and can be
-	 * controlled by the syscon registers of JH7110. They will be dropped
-	 * and registered in the PLL clock driver instead.
-	 */
-	/* 24MHz -> 1000.0MHz */
-	priv->pll[0] = devm_clk_hw_register_fixed_factor(priv->dev, "pll0_out",
-							 "osc", 0, 125, 3);
-	if (IS_ERR(priv->pll[0]))
-		return PTR_ERR(priv->pll[0]);
-
-	/* 24MHz -> 1066.0MHz */
-	priv->pll[1] = devm_clk_hw_register_fixed_factor(priv->dev, "pll1_out",
-							 "osc", 0, 533, 12);
-	if (IS_ERR(priv->pll[1]))
-		return PTR_ERR(priv->pll[1]);
-
-	/* 24MHz -> 1188.0MHz */
-	priv->pll[2] = devm_clk_hw_register_fixed_factor(priv->dev, "pll2_out",
-							 "osc", 0, 99, 2);
-	if (IS_ERR(priv->pll[2]))
-		return PTR_ERR(priv->pll[2]);
+	/* Use fixed factor clocks if can not get the PLL clocks from DTS */
+	pllclk = clk_get(priv->dev, "pll0_out");
+	if (IS_ERR(pllclk)) {
+		/* 24MHz -> 1000.0MHz */
+		priv->pll[0] = devm_clk_hw_register_fixed_factor(priv->dev, "pll0_out",
+								 "osc", 0, 125, 3);
+		if (IS_ERR(priv->pll[0]))
+			return PTR_ERR(priv->pll[0]);
+	} else {
+		clk_put(pllclk);
+		priv->pll[0] = NULL;
+	}
+
+	pllclk = clk_get(priv->dev, "pll1_out");
+	if (IS_ERR(pllclk)) {
+		/* 24MHz -> 1066.0MHz */
+		priv->pll[1] = devm_clk_hw_register_fixed_factor(priv->dev, "pll1_out",
+								 "osc", 0, 533, 12);
+		if (IS_ERR(priv->pll[1]))
+			return PTR_ERR(priv->pll[1]);
+	} else {
+		clk_put(pllclk);
+		priv->pll[1] = NULL;
+	}
+
+	pllclk = clk_get(priv->dev, "pll2_out");
+	if (IS_ERR(pllclk)) {
+		/* 24MHz -> 1188.0MHz */
+		priv->pll[2] = devm_clk_hw_register_fixed_factor(priv->dev, "pll2_out",
+								 "osc", 0, 99, 2);
+		if (IS_ERR(priv->pll[2]))
+			return PTR_ERR(priv->pll[2]);
+	} else {
+		clk_put(pllclk);
+		priv->pll[2] = NULL;
+	}
 
 	for (idx = 0; idx < JH7110_SYSCLK_END; idx++) {
 		u32 max = jh7110_sysclk_data[idx].max;
@@ -462,6 +478,12 @@ static int __init jh7110_syscrg_probe(struct platform_device *pdev)
 				parents[i].fw_name = "tdm_ext";
 			else if (pidx == JH7110_SYSCLK_MCLK_EXT)
 				parents[i].fw_name = "mclk_ext";
+			else if (pidx == JH7110_SYSCLK_PLL0_OUT && !priv->pll[0])
+				parents[i].fw_name = "pll0_out";
+			else if (pidx == JH7110_SYSCLK_PLL1_OUT && !priv->pll[1])
+				parents[i].fw_name = "pll1_out";
+			else if (pidx == JH7110_SYSCLK_PLL2_OUT && !priv->pll[2])
+				parents[i].fw_name = "pll2_out";
 			else
 				parents[i].hw = priv->pll[pidx - JH7110_SYSCLK_PLL0_OUT];
 		}
-- 
2.25.1