[PATCH v1 20/22] clk: starfive: Add StarFive JHB100 Peripheral-3 clock driver

From: Changhuang Liang

Date: Thu Apr 02 2026 - 07:19:22 EST

Add driver for the StarFive JHB100 Peripheral-3 clock controller.

Signed-off-by: Changhuang Liang <changhuang.liang@xxxxxxxxxxxxxxxx>
---
drivers/clk/starfive/Kconfig | 8 +
drivers/clk/starfive/Makefile | 1 +
.../clk/starfive/clk-starfive-jhb100-per3.c | 189 ++++++++++++++++++
3 files changed, 198 insertions(+)
create mode 100644 drivers/clk/starfive/clk-starfive-jhb100-per3.c

diff --git a/drivers/clk/starfive/Kconfig b/drivers/clk/starfive/Kconfig
index 01d6d325dcd0..c612f1ede7d7 100644
--- a/drivers/clk/starfive/Kconfig
+++ b/drivers/clk/starfive/Kconfig
@@ -97,6 +97,14 @@ config CLK_STARFIVE_JHB100_PER2
Say yes here to support the peripheral-2 clock controller
on the StarFive JHB100 SoC.

+config CLK_STARFIVE_JHB100_PER3
+ bool "StarFive JHB100 peripheral-3 clock support"
+ depends on CLK_STARFIVE_JHB100_SYS1
+ default ARCH_STARFIVE
+ help
+ Say yes here to support the peripheral-3 clock controller
+ on the StarFive JHB100 SoC.
+
config CLK_STARFIVE_JHB100_SYS0
bool "StarFive JHB100 system-0 clock support"
depends on ARCH_STARFIVE || COMPILE_TEST
diff --git a/drivers/clk/starfive/Makefile b/drivers/clk/starfive/Makefile
index 044e1942ccfa..f00690f0cdad 100644
--- a/drivers/clk/starfive/Makefile
+++ b/drivers/clk/starfive/Makefile
@@ -14,6 +14,7 @@ obj-$(CONFIG_CLK_STARFIVE_JH7110_VOUT) += clk-starfive-jh7110-vout.o
obj-$(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_SYS0) += clk-starfive-jhb100-sys0.o
obj-$(CONFIG_CLK_STARFIVE_JHB100_SYS1) += clk-starfive-jhb100-sys1.o
obj-$(CONFIG_CLK_STARFIVE_JHB100_SYS2) += clk-starfive-jhb100-sys2.o
diff --git a/drivers/clk/starfive/clk-starfive-jhb100-per3.c b/drivers/clk/starfive/clk-starfive-jhb100-per3.c
new file mode 100644
index 000000000000..5533bb481f6d
--- /dev/null
+++ b/drivers/clk/starfive/clk-starfive-jhb100-per3.c
@@ -0,0 +1,189 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * StarFive JHB100 Peripheral-3 Clock Driver
+ *
+ * Copyright (C) 2024 StarFive Technology Co., Ltd.
+ *
+ * Author: Changhuang Liang <changhuang.liang@xxxxxxxxxxxxxxxx>
+ *
+ */
+
+#include <dt-bindings/clock/starfive,jhb100-crg.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/platform_device.h>
+
+#include "clk-starfive-jhb100.h"
+
+#define JHB100_PER3CLK_NUM_CLKS (JHB100_PER3CLK_MAIN_ICG_EN_GMAC1 + 1)
+
+/* external clocks */
+#define JHB100_PER3CLK_100 (JHB100_PER3CLK_NUM_CLKS + 0)
+#define JHB100_PER3CLK_125 (JHB100_PER3CLK_NUM_CLKS + 1)
+#define JHB100_PER3CLK_600 (JHB100_PER3CLK_NUM_CLKS + 2)
+#define JHB100_PER3CLK_OSC (JHB100_PER3CLK_NUM_CLKS + 3)
+#define JHB100_PER3CLK_GMAC0_RMII_RCLKI (JHB100_PER3CLK_NUM_CLKS + 4)
+#define JHB100_PER3CLK_GMAC1_SGMII_TX (JHB100_PER3CLK_NUM_CLKS + 5)
+#define JHB100_PER3CLK_GMAC1_SGMII_RX (JHB100_PER3CLK_NUM_CLKS + 6)
+
+static const struct starfive_clk_data jhb100_per3crg_clk_data[] = {
+ STARFIVE__DIV(JHB100_PER3CLK_300, "per3_300", 256,
+ JHB100_PER3CLK_600),
+ STARFIVE__DIV(JHB100_PER3CLK_200, "per3_200", 256,
+ JHB100_PER3CLK_600),
+ STARFIVE__DIV(JHB100_PER3CLK_GMAC1_PTP_REF, "gmac1_ptp_ref", 2,
+ JHB100_PER3CLK_100),
+ STARFIVE__MUX(JHB100_PER3CLK_GMAC1_TX_125_MUX, "gmac1_tx_125_mux", 0, 2,
+ JHB100_PER3CLK_GMAC1_SGMII_TX,
+ JHB100_PER3CLK_125),
+ STARFIVE__DIV(JHB100_PER3CLK_GMAC1_TX, "gmac1_tx", 50,
+ JHB100_PER3CLK_GMAC1_TX_125_MUX),
+ STARFIVE__MUX(JHB100_PER3CLK_GMAC1_RX_125_MUX, "gmac1_rx_125_mux", 0, 2,
+ JHB100_PER3CLK_GMAC1_SGMII_RX,
+ JHB100_PER3CLK_125),
+ STARFIVE__DIV(JHB100_PER3CLK_GMAC1_RX, "gmac1_rx", 50,
+ JHB100_PER3CLK_GMAC1_RX_125_MUX),
+ STARFIVE__DIV(JHB100_PER3CLK_GMAC0_PTP_REF, "gmac0_ptp_ref", 2,
+ JHB100_PER3CLK_100),
+ STARFIVE__DIV(JHB100_PER3CLK_GMAC0_RMII_PLL, "gmac0_rmii_pll", 2,
+ JHB100_PER3CLK_100),
+ STARFIVE__MUX(JHB100_PER3CLK_GMAC0_RMII_MUX, "gmac0_rmii_mux", 0, 2,
+ JHB100_PER3CLK_GMAC0_RMII_PLL,
+ JHB100_PER3CLK_GMAC0_RMII_RCLKI),
+ STARFIVE__DIV(JHB100_PER3CLK_GMAC0_RMII_MUX_DIV2, "gmac0_rmii_mux_div2", 20,
+ JHB100_PER3CLK_GMAC0_RMII_MUX),
+ STARFIVE_GATE(JHB100_PER3CLK_ETHER0_RMII_CLK_TX_I, "ether0_rmii_clk_tx_i",
+ CLK_IGNORE_UNUSED, JHB100_PER3CLK_GMAC0_RMII_MUX_DIV2),
+ STARFIVE_GATE(JHB100_PER3CLK_ETHER0_RMII_CLK_RX_I, "ether0_rmii_clk_rx_i",
+ CLK_IGNORE_UNUSED, JHB100_PER3CLK_GMAC0_RMII_MUX_DIV2),
+ STARFIVE_GATE(JHB100_PER3CLK_ETHER0_RMII_CLK_PTP_REF_I, "ether0_rmii_clk_ptp_ref_i",
+ CLK_IGNORE_UNUSED, JHB100_PER3CLK_GMAC0_PTP_REF),
+ STARFIVE_GATE(JHB100_PER3CLK_ETHER0_RMII_CLK_RMII_I, "ether0_rmii_clk_rmii_i",
+ CLK_IGNORE_UNUSED, JHB100_PER3CLK_GMAC0_RMII_MUX),
+ STARFIVE_GATE(JHB100_PER3CLK_ETHER0_RMII_CLK_CSR_I, "ether0_rmii_clk_csr_i",
+ CLK_IGNORE_UNUSED, JHB100_PER3CLK_100),
+ STARFIVE_GATE(JHB100_PER3CLK_ETHER0_RMII_ACLK_I, "ether0_rmii_aclk_i",
+ CLK_IGNORE_UNUSED, JHB100_PER3CLK_300),
+ STARFIVE_GATE(JHB100_PER3CLK_GMAC0_RMII_RCLKO, "gmac0_rmii_rclko",
+ CLK_IGNORE_UNUSED, JHB100_PER3CLK_GMAC0_RMII_PLL),
+ STARFIVE_GATE(JHB100_PER3CLK_ETHER0_SGMII_CLK_TX_I, "ether0_sgmii_clk_tx_i",
+ CLK_IGNORE_UNUSED, JHB100_PER3CLK_GMAC1_TX),
+ STARFIVE_GATE(JHB100_PER3CLK_ETHER0_SGMII_CLK_RX_I, "ether0_sgmii_clk_rx_i",
+ CLK_IGNORE_UNUSED, JHB100_PER3CLK_GMAC1_RX),
+ STARFIVE_GATE(JHB100_PER3CLK_ETHER0_SGMII_CLK_TX_125_I, "ether0_sgmii_clk_tx_125_i",
+ CLK_IGNORE_UNUSED, JHB100_PER3CLK_GMAC1_TX_125_MUX),
+ STARFIVE_GATE(JHB100_PER3CLK_ETHER0_SGMII_CLK_RX_125_I, "ether0_sgmii_clk_rx_125_i",
+ CLK_IGNORE_UNUSED, JHB100_PER3CLK_GMAC1_RX_125_MUX),
+ STARFIVE_GATE(JHB100_PER3CLK_ETHER0_SGMII_CLK_PTP_REF_I, "ether0_sgmii_clk_ptp_ref_i",
+ CLK_IGNORE_UNUSED, JHB100_PER3CLK_GMAC1_PTP_REF),
+ STARFIVE_GATE(JHB100_PER3CLK_ETHER0_SGMII_CLK_REF_25_I, "ether0_sgmii_clk_ref_25_i",
+ CLK_IGNORE_UNUSED, JHB100_PER3CLK_OSC),
+ STARFIVE_GATE(JHB100_PER3CLK_ETHER0_SGMII_CLK_CSR_I, "ether0_sgmii_clk_csr_i",
+ CLK_IGNORE_UNUSED, JHB100_PER3CLK_100),
+ STARFIVE_GATE(JHB100_PER3CLK_ETHER0_SGMII_ACLK_I, "ether0_sgmii_aclk_i",
+ CLK_IGNORE_UNUSED, JHB100_PER3CLK_300),
+ STARFIVE_GATE(JHB100_PER3CLK_ETHER0_SGMII_PHY_PCLK_I, "ether0_sgmii_phy_pclk_i",
+ CLK_IGNORE_UNUSED, JHB100_PER3CLK_100),
+ STARFIVE_GATE(JHB100_PER3CLK_MAIN_ICG_EN_SENSORS_PERIPH3, "main_icg_en_sensors_periph3", 0,
+ JHB100_PER3CLK_100),
+ STARFIVE_GATE(JHB100_PER3CLK_MAIN_ICG_EN_PECI0, "main_icg_en_peci0", 0,
+ JHB100_PER3CLK_100),
+ STARFIVE_GATE(JHB100_PER3CLK_MAIN_ICG_EN_PECI1, "main_icg_en_peci1", 0,
+ JHB100_PER3CLK_100),
+ STARFIVE_GATE(JHB100_PER3CLK_MAIN_ICG_EN_GMAC0, "main_icg_en_gmac0",
+ CLK_IS_CRITICAL, JHB100_PER3CLK_100),
+ STARFIVE_GATE(JHB100_PER3CLK_MAIN_ICG_EN_GMAC1, "main_icg_en_gmac1",
+ CLK_IS_CRITICAL, JHB100_PER3CLK_100),
+};
+
+static int jhb100_per3crg_probe(struct platform_device *pdev)
+{
+ struct starfive_clk_priv *priv;
+ unsigned int idx;
+ int ret;
+
+ priv = devm_kzalloc(&pdev->dev,
+ struct_size(priv, reg, JHB100_PER3CLK_NUM_CLKS),
+ GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ spin_lock_init(&priv->rmw_lock);
+ priv->num_reg = JHB100_PER3CLK_NUM_CLKS;
+ priv->dev = &pdev->dev;
+ priv->base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(priv->base))
+ return PTR_ERR(priv->base);
+
+ for (idx = 0; idx < JHB100_PER3CLK_NUM_CLKS; idx++) {
+ u32 max = jhb100_per3crg_clk_data[idx].max;
+ struct clk_parent_data parents[4] = {};
+ struct clk_init_data init = {
+ .name = jhb100_per3crg_clk_data[idx].name,
+ .ops = starfive_clk_ops(max),
+ .parent_data = parents,
+ .num_parents =
+ ((max & STARFIVE_CLK_MUX_MASK) >> STARFIVE_CLK_MUX_SHIFT) + 1,
+ .flags = jhb100_per3crg_clk_data[idx].flags,
+ };
+ struct starfive_clk *clk = &priv->reg[idx];
+ unsigned int i;
+
+ if (!init.name)
+ continue;
+
+ for (i = 0; i < init.num_parents; i++) {
+ unsigned int pidx = jhb100_per3crg_clk_data[idx].parents[i];
+
+ if (pidx < JHB100_PER3CLK_NUM_CLKS)
+ parents[i].hw = &priv->reg[pidx].hw;
+ else if (pidx == JHB100_PER3CLK_100)
+ parents[i].fw_name = "per3_100";
+ else if (pidx == JHB100_PER3CLK_125)
+ parents[i].fw_name = "per3_125";
+ else if (pidx == JHB100_PER3CLK_600)
+ parents[i].fw_name = "per3_600";
+ else if (pidx == JHB100_PER3CLK_OSC)
+ parents[i].fw_name = "osc";
+ else if (pidx == JHB100_PER3CLK_GMAC0_RMII_RCLKI)
+ parents[i].fw_name = "per3_gmac0_rmii_rclki";
+ else if (pidx == JHB100_PER3CLK_GMAC1_SGMII_TX)
+ parents[i].fw_name = "per3_gmac1_sgmii_tx";
+ else if (pidx == JHB100_PER3CLK_GMAC1_SGMII_RX)
+ parents[i].fw_name = "per3_gmac1_sgmii_rx";
+ }
+
+ clk->hw.init = &init;
+ clk->idx = idx;
+ clk->max_div = max & STARFIVE_CLK_DIV_MASK;
+
+ ret = devm_clk_hw_register(&pdev->dev, &clk->hw);
+ if (ret)
+ return ret;
+ }
+
+ ret = devm_of_clk_add_hw_provider(&pdev->dev, starfive_clk_get, priv);
+ if (ret)
+ return ret;
+
+ return jhb100_reset_controller_register(priv, "r-per3", 0);
+}
+
+static const struct of_device_id jhb100_per3crg_match[] = {
+ { .compatible = "starfive,jhb100-per3crg" },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, jhb100_per3crg_match);
+
+static struct platform_driver jhb100_per3crg_driver = {
+ .probe = jhb100_per3crg_probe,
+ .driver = {
+ .name = "clk-starfive-jhb100-per3",
+ .of_match_table = jhb100_per3crg_match,
+ },
+};
+module_platform_driver(jhb100_per3crg_driver);
+
+MODULE_AUTHOR("Changhuang Liang <changhuang.liang@xxxxxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("StarFive JHB100 Peripheral-3 Clock Driver");
+MODULE_LICENSE("GPL");
--
2.25.1