[PATCH v6 2/5] clk: starfive: Add Peripheral-0 domain PLL clock driver

[Changhuang Liang]

Add Peripheral-0 domain PLL clock driver support for StarFive JHB100
SoC. It binds to the per0 system controller node and registers PLL6
using the JHB100 PLL library.

Signed-off-by: Changhuang Liang <changhuang.liang at starfivetech.com>
---
 drivers/clk/starfive/Kconfig                  | 12 +++
 drivers/clk/starfive/Makefile                 |  1 +
 .../starfive/clk-starfive-jhb100-per-pll.c    | 76 +++++++++++++++++++
 3 files changed, 89 insertions(+)
 create mode 100644 drivers/clk/starfive/clk-starfive-jhb100-per-pll.c

diff --git a/drivers/clk/starfive/Kconfig b/drivers/clk/starfive/Kconfig
index 4a7c67445f4c..00c46f5ec976 100644
--- a/drivers/clk/starfive/Kconfig
+++ b/drivers/clk/starfive/Kconfig
@@ -113,6 +113,18 @@ config CLK_STARFIVE_JHB100_PER3
 	  Say yes here to support the peripheral-3 clock controller
 	  on the StarFive JHB100 SoC.
 
+config CLK_STARFIVE_JHB100_PER_PLL
+	bool "StarFive JHB100 peripheral PLL clock support"
+	depends on ARCH_STARFIVE || COMPILE_TEST
+	select CLK_STARFIVE_JHB100_PLL
+	select MFD_SYSCON
+	default ARCH_STARFIVE
+	help
+	  Say yes here to support the PLL6 clock generator found in the
+	  peripheral-0 system controller of the StarFive JHB100 SoC. It
+	  provides the parent clock of the peripheral-0 clock
+	  controller.
+
 config CLK_STARFIVE_JHB100_PLL
 	bool
 
diff --git a/drivers/clk/starfive/Makefile b/drivers/clk/starfive/Makefile
index 3a8f75c55c96..e31ded58bd6f 100644
--- a/drivers/clk/starfive/Makefile
+++ b/drivers/clk/starfive/Makefile
@@ -15,6 +15,7 @@ obj-$(CONFIG_CLK_STARFIVE_JHB100_PER0)		+= clk-starfive-jhb100-per0.o
 obj-$(CONFIG_CLK_STARFIVE_JHB100_PER1)		+= clk-starfive-jhb100-per1.o
 obj-$(CONFIG_CLK_STARFIVE_JHB100_PER2)		+= clk-starfive-jhb100-per2.o
 obj-$(CONFIG_CLK_STARFIVE_JHB100_PER3)		+= clk-starfive-jhb100-per3.o
+obj-$(CONFIG_CLK_STARFIVE_JHB100_PER_PLL)	+= clk-starfive-jhb100-per-pll.o
 obj-$(CONFIG_CLK_STARFIVE_JHB100_PLL)		+= clk-starfive-jhb100-pll.o
 obj-$(CONFIG_CLK_STARFIVE_JHB100_SYS0)		+= clk-starfive-jhb100-sys0.o
 obj-$(CONFIG_CLK_STARFIVE_JHB100_SYS0_PLL)	+= clk-starfive-jhb100-sys0-pll.o
diff --git a/drivers/clk/starfive/clk-starfive-jhb100-per-pll.c b/drivers/clk/starfive/clk-starfive-jhb100-per-pll.c
new file mode 100644
index 000000000000..d38116f16935
--- /dev/null
+++ b/drivers/clk/starfive/clk-starfive-jhb100-per-pll.c
@@ -0,0 +1,76 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * StarFive JHB100 Peripheral domain PLL Clock Driver
+ *
+ * Copyright (C) 2024 StarFive Technology Co., Ltd.
+ *
+ * Author: Changhuang Liang <changhuang.liang at starfivetech.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/mfd/syscon.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/property.h>
+#include <linux/regmap.h>
+
+#include <dt-bindings/clock/starfive,jhb100-crg.h>
+
+#include "clk-starfive-jhb100-pll.h"
+
+#define JHB100_PLL6_OFFSET		0x00
+
+struct jhb100_per_pll_data {
+	const struct jhb100_pll_info *info;
+	unsigned int num;
+};
+
+static const struct jhb100_pll_mult jhb100_pll6_mults[] = {
+	{ .fbdiv = 192, .frac = 0, .refdiv = 1 },
+};
+
+static const struct jhb100_pll_info jhb100_per0_pll_info[] = {
+	JHB100_PLL(JHB100_PER0PLL_PLL6_OUT, "pll6", JHB100_PLL6_OFFSET,
+		   jhb100_pll6_mults, ARRAY_SIZE(jhb100_pll6_mults)),
+};
+
+static const struct jhb100_per_pll_data jhb100_per0_pll_data = {
+	.info = jhb100_per0_pll_info,
+	.num = ARRAY_SIZE(jhb100_per0_pll_info),
+};
+
+static int jhb100_per_pll_probe(struct platform_device *pdev)
+{
+	const struct jhb100_per_pll_data *data;
+	struct device *dev = &pdev->dev;
+	struct regmap *regmap;
+
+	data = device_get_match_data(dev);
+	if (!data)
+		return -ENODEV;
+
+	regmap = syscon_node_to_regmap(dev_of_node(dev));
+	if (IS_ERR(regmap))
+		return dev_err_probe(dev, PTR_ERR(regmap),
+				     "failed to get syscon regmap\n");
+
+	return devm_jhb100_pll_register(dev, regmap, data->info, data->num);
+}
+
+static const struct of_device_id jhb100_per_pll_match[] = {
+	{
+		.compatible = "starfive,jhb100-per0-syscon",
+		.data = &jhb100_per0_pll_data,
+	},
+	{ /* sentinel */ }
+};
+
+static struct platform_driver jhb100_per_pll_driver = {
+	.probe = jhb100_per_pll_probe,
+	.driver = {
+		.name = "clk-starfive-jhb100-per-pll",
+		.of_match_table = jhb100_per_pll_match,
+		.suppress_bind_attrs = true,
+	},
+};
+builtin_platform_driver(jhb100_per_pll_driver);
-- 
2.25.1