[PATCH v3 11/19] soc: starfive: Add jh7110-hdmi-subsystem driver

@@ -24,6 +24,7 @@ source "drivers/soc/renesas/Kconfig"
 source "drivers/soc/rockchip/Kconfig"
 source "drivers/soc/samsung/Kconfig"
 source "drivers/soc/sophgo/Kconfig"
+source "drivers/soc/starfive/Kconfig"
 source "drivers/soc/sunxi/Kconfig"
 source "drivers/soc/tegra/Kconfig"
 source "drivers/soc/ti/Kconfig"

@@ -30,6 +30,7 @@ obj-y				+= renesas/
 obj-y				+= rockchip/
 obj-$(CONFIG_SOC_SAMSUNG)	+= samsung/
 obj-y				+= sophgo/
+obj-y				+= starfive/
 obj-y				+= sunxi/
 obj-$(CONFIG_ARCH_TEGRA)	+= tegra/
 obj-y				+= ti/

@@ -0,0 +1,28 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Starfive SoC drivers
+#
+
+if ARCH_STARFIVE || COMPILE_TEST
+menu "Starfive SoC drivers"
+
+config SOC_STARFIVE_JH7110_HDMI_SUBSYSTEM
+	tristate "StarFive JH7110 HDMI subsystem driver"
+	depends on OF
+	select REGMAP_MMIO
+	help
+	  This option enables the parent driver
+	  for the monolithic StarFive JH7110 HDMI peripheral.
+
+	  The JH7110 HDMI IP block contains both the digital controller
+	  (DRM bridge) and the analog PHY (clock/phy provider) logic within
+	  a single shared register space.
+
+	  This driver acts as a wrapper. Its only job is to map the
+	  shared registers and create separate logical child devices
+	  for the "PHY" and the "controller". This is required to
+	  correctly manage resources and break a circular clock dependency
+	  between the PHY and the VOUT clock generator at probe time.
+
+endmenu
+endif

@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0-only
+obj-$(CONFIG_SOC_STARFIVE_JH7110_HDMI_SUBSYSTEM) += jh7110-hdmi-subsystem.o

@@ -0,0 +1,74 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Driver for the StarFive JH7110 HDMI subsystem
+ *
+ * Copyright (c) 2025 Samsung Electronics Co., Ltd.
+ * Author: Michal Wilczynski <m.wilczynski@samsung.com>
+ *
+ * This driver binds to the monolithic HDMI block and creates separate
+ * logical platform devices for the HDMI Controller (bridge) and the
+ * HDMI PHY (clock/phy provider), allowing them to share a single regmap
+ * and breaking the probing circular dependency.
+ */
+
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+static const struct regmap_config starfive_hdmi_regmap_config = {
+	.reg_bits = 32,
+	.val_bits = 8,
+	.max_register = 0x3fff,
+};
+
+static int starfive_hdmi_subsys_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct regmap *regmap;
+	void __iomem *regs;
+	int ret;
+
+	/*
+	 * The NoC display bus clock and reset that gate access to this region,
+	 * and the PD_VOUT power domain it sits in, are held by the video
+	 * output subsystem parent for as long as this device exists.
+	 */
+	regs = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(regs))
+		return PTR_ERR(regs);
+
+	regmap = devm_regmap_init_mmio(dev, regs,
+				       &starfive_hdmi_regmap_config);
+	if (IS_ERR(regmap))
+		return dev_err_probe(dev, PTR_ERR(regmap),
+				     "Failed to init shared regmap\n");
+
+	ret = devm_of_platform_populate(dev);
+	if (ret)
+		return dev_err_probe(dev, ret,
+				     "Failed to populate child devices\n");
+
+	return 0;
+}
+
+static const struct of_device_id starfive_hdmi_subsys_of_match[] = {
+	{ .compatible = "starfive,jh7110-hdmi-subsystem", },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, starfive_hdmi_subsys_of_match);
+
+static struct platform_driver starfive_hdmi_subsys_driver = {
+	.probe = starfive_hdmi_subsys_probe,
+	.driver = {
+		.name = "starfive-hdmi-subsystem",
+		.of_match_table = starfive_hdmi_subsys_of_match,
+	},
+};
+module_platform_driver(starfive_hdmi_subsys_driver);
+
+MODULE_AUTHOR("Michal Wilczynski <m.wilczynski@samsung.com>");
+MODULE_DESCRIPTION("StarFive JH7110 HDMI subsystem Driver");
+MODULE_LICENSE("GPL");