Add the wrapper driver for the StarFive JH7110 VOUT subsystem. This driver is responsible for managing the shared resources for all video output devices. It enables the PD_VOUT power domain, enables the top-level NoC bus clock, and deasserts the main bus reset.
Once these resources are active, it calls of_platform_populate() to create and probe the child devices (DC8200, VOUTCRG, HDMI MFD) that reside within this subsystem. Signed-off-by: Michal Wilczynski <[email protected]> --- MAINTAINERS | 1 + drivers/soc/Kconfig | 1 + drivers/soc/Makefile | 1 + drivers/soc/starfive/Kconfig | 25 ++++++ drivers/soc/starfive/Makefile | 2 + drivers/soc/starfive/jh7110-vout-subsystem.c | 117 +++++++++++++++++++++++++++ 6 files changed, 147 insertions(+) diff --git a/MAINTAINERS b/MAINTAINERS index 052876c6538f980f75ff64e78b6ebea460307904..74e562a6b57ac9f776c4be2d6f0977c62bc03d46 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -24051,6 +24051,7 @@ F: Documentation/devicetree/bindings/display/bridge/starfive,jh7110-inno-hdmi-co F: Documentation/devicetree/bindings/mfd/starfive,jh7110-hdmi-mfd.yaml F: Documentation/devicetree/bindings/phy/starfive,jh7110-inno-hdmi-phy.yaml F: Documentation/devicetree/bindings/soc/starfive/starfive,jh7110-vout-subsystem.yaml +F: drivers/soc/starfive/jh7110-vout-subsystem.c STARFIVE JH7110 DPHY RX DRIVER M: Jack Zhu <[email protected]> diff --git a/drivers/soc/Kconfig b/drivers/soc/Kconfig index a2d65adffb8052c0ac5a6b60bf33fa9c644701bb..b3b01fc38139d98076c14f626a42ae3b7ef7c5d6 100644 --- a/drivers/soc/Kconfig +++ b/drivers/soc/Kconfig @@ -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" diff --git a/drivers/soc/Makefile b/drivers/soc/Makefile index c9e689080ceb759384f690c2b65a82b3cb451c74..009f85ff891a15e0455f92c5d5a4059d8b1fcd3f 100644 --- a/drivers/soc/Makefile +++ b/drivers/soc/Makefile @@ -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/ diff --git a/drivers/soc/starfive/Kconfig b/drivers/soc/starfive/Kconfig new file mode 100644 index 0000000000000000000000000000000000000000..47e82aaaa7e0af9d5c718166601c59c1ca683d3a --- /dev/null +++ b/drivers/soc/starfive/Kconfig @@ -0,0 +1,25 @@ +# SPDX-License-Identifier: GPL-2.0-only +# +# Starfive SoC drivers +# + +if ARCH_STARFIVE || COMPILE_TEST +menu "Starfive SoC drivers" + +config SOC_STARFIVE_JH7110_VOUT_SUBSYSTEM + tristate "StarFive JH7110 VOUT Subsystem Manager" + help + Enable this option to support the VOUT (Video Output) subsystem on + the StarFive JH7110 SoC. + + This driver acts as a parent wrapper for all display related + hardware blocks (DC8200, VOUTCRG, HDMI MFD). Its primary + responsibility is to manage the shared PD_VOUT power domain, + enabling power, clocks, and resets for the entire subsystem + before the individual child drivers are probed. + + This is essential for the display hardware to be detected and + to function correctly. + +endmenu +endif diff --git a/drivers/soc/starfive/Makefile b/drivers/soc/starfive/Makefile new file mode 100644 index 0000000000000000000000000000000000000000..17081cd67635b02f495230b117c9acb691ef33ba --- /dev/null +++ b/drivers/soc/starfive/Makefile @@ -0,0 +1,2 @@ +# SPDX-License-Identifier: GPL-2.0-only +obj-$(CONFIG_SOC_STARFIVE_JH7110_VOUT_SUBSYSTEM) += jh7110-vout-subsystem.o diff --git a/drivers/soc/starfive/jh7110-vout-subsystem.c b/drivers/soc/starfive/jh7110-vout-subsystem.c new file mode 100644 index 0000000000000000000000000000000000000000..a67fd1cbac6b97c0c78c5dff444450579beca91d --- /dev/null +++ b/drivers/soc/starfive/jh7110-vout-subsystem.c @@ -0,0 +1,117 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2025 Samsung Electronics Co., Ltd. + * Author: Michal Wilczynski <[email protected]> + */ + +#include <linux/clk.h> +#include <linux/module.h> +#include <linux/of_platform.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/reset.h> + +static void devm_clk_disable_unprepare(void *data) +{ + struct clk *clk = data; + + clk_disable_unprepare(clk); +} + +static void devm_reset_control_assert(void *data) +{ + struct reset_control *rst = data; + + reset_control_assert(rst); +} + +static int jh7110_vout_subsystem_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct clk *bus_clk; + struct reset_control *bus_rst; + int ret; + + bus_clk = devm_clk_get(dev, NULL); + if (IS_ERR(bus_clk)) + return dev_err_probe(dev, PTR_ERR(bus_clk), "Failed to get bus clock\n"); + + bus_rst = devm_reset_control_get_exclusive(dev, NULL); + if (IS_ERR(bus_rst)) + return dev_err_probe(dev, PTR_ERR(bus_rst), "Failed to get bus reset\n"); + + pm_runtime_enable(dev); + ret = pm_runtime_resume_and_get(dev); + if (ret < 0) { + dev_err(dev, "Failed to enable power domain: %d\n", ret); + pm_runtime_disable(dev); + return ret; + } + + ret = clk_prepare_enable(bus_clk); + if (ret) { + dev_err(dev, "Failed to enable bus clock: %d\n", ret); + goto err_pm_put; + } + + ret = devm_add_action_or_reset(dev, devm_clk_disable_unprepare, bus_clk); + if (ret) { + dev_err(dev, "Failed to register clk disable action: %d\n", ret); + goto err_pm_put; + } + + ret = reset_control_deassert(bus_rst); + if (ret) { + dev_err(dev, "Failed to deassert bus reset: %d\n", ret); + goto err_pm_put; + } + + ret = devm_add_action_or_reset(dev, devm_reset_control_assert, bus_rst); + if (ret) { + dev_err(dev, "Failed to register reset assert action: %d\n", ret); + goto err_pm_put; + } + + dev_info(dev, "VOUT subsystem bus interface is powered on\n"); + + ret = of_platform_populate(dev->of_node, NULL, NULL, dev); + if (ret) { + dev_err(dev, "Failed to populate child devices: %d\n", ret); + goto err_pm_put; + } + + return 0; + +err_pm_put: + pm_runtime_put_sync(dev); + pm_runtime_disable(dev); + return ret; +} + +static void jh7110_vout_subsystem_remove(struct platform_device *pdev) +{ + of_platform_depopulate(&pdev->dev); + + pm_runtime_put_sync(&pdev->dev); + pm_runtime_disable(&pdev->dev); +} + +static const struct of_device_id vout_subsystem_of_match[] = { + { .compatible = "starfive,jh7110-vout-subsystem", }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, vout_subsystem_of_match); + +static struct platform_driver jh7110_vout_subsystem_driver = { + .probe = jh7110_vout_subsystem_probe, + .remove = jh7110_vout_subsystem_remove, + .driver = { + .name = "jh7110-vout-subsystem", + .of_match_table = vout_subsystem_of_match, + }, +}; +module_platform_driver(jh7110_vout_subsystem_driver); + +MODULE_AUTHOR("Michal Wilczynski <[email protected]>"); +MODULE_DESCRIPTION("StarFive JH7110 VOUT Subsystem Manager"); +MODULE_LICENSE("GPL"); -- 2.34.1
