The HDMI block has a block that controls clocks and reset signals to the HDMI0 and HDMI1 controllers.
Let's expose that through a clock driver implementing a clock and reset provider.
Cc: Michael Turquette mturquette@baylibre.com Cc: Stephen Boyd sboyd@kernel.org Cc: Rob Herring robh+dt@kernel.org Cc: linux-clk@vger.kernel.org Cc: devicetree@vger.kernel.org Signed-off-by: Maxime Ripard maxime@cerno.tech --- drivers/clk/bcm/Kconfig | 1 +- drivers/clk/bcm/Makefile | 1 +- drivers/clk/bcm/clk-bcm2711-dvp.c | 113 +++++++++++++++++++++++++++++++- 3 files changed, 115 insertions(+) create mode 100644 drivers/clk/bcm/clk-bcm2711-dvp.c
diff --git a/drivers/clk/bcm/Kconfig b/drivers/clk/bcm/Kconfig index 8c83977a7dc4..03bbd8040451 100644 --- a/drivers/clk/bcm/Kconfig +++ b/drivers/clk/bcm/Kconfig @@ -4,6 +4,7 @@ config CLK_BCM2835 depends on ARCH_BCM2835 || ARCH_BRCMSTB || COMPILE_TEST depends on COMMON_CLK default ARCH_BCM2835 || ARCH_BRCMSTB + select RESET_SIMPLE help Enable common clock framework support for Broadcom BCM2835 SoCs. diff --git a/drivers/clk/bcm/Makefile b/drivers/clk/bcm/Makefile index 0070ddf6cdd2..2c1349062147 100644 --- a/drivers/clk/bcm/Makefile +++ b/drivers/clk/bcm/Makefile @@ -6,6 +6,7 @@ obj-$(CONFIG_CLK_BCM_KONA) += clk-kona-setup.o obj-$(CONFIG_CLK_BCM_KONA) += clk-bcm281xx.o obj-$(CONFIG_CLK_BCM_KONA) += clk-bcm21664.o obj-$(CONFIG_COMMON_CLK_IPROC) += clk-iproc-armpll.o clk-iproc-pll.o clk-iproc-asiu.o +obj-$(CONFIG_CLK_BCM2835) += clk-bcm2711-dvp.o obj-$(CONFIG_CLK_BCM2835) += clk-bcm2835.o obj-$(CONFIG_CLK_BCM2835) += clk-bcm2835-aux.o obj-$(CONFIG_CLK_RASPBERRYPI) += clk-raspberrypi.o diff --git a/drivers/clk/bcm/clk-bcm2711-dvp.c b/drivers/clk/bcm/clk-bcm2711-dvp.c new file mode 100644 index 000000000000..f4773cc92724 --- /dev/null +++ b/drivers/clk/bcm/clk-bcm2711-dvp.c @@ -0,0 +1,113 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +// Copyright 2020 Cerno + +#include <linux/clk-provider.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/reset-controller.h> +#include <linux/reset/reset-simple.h> + +#define DVP_HT_RPI_SW_INIT 0x04 +#define DVP_HT_RPI_MISC_CONFIG 0x08 + +#define NR_CLOCKS 2 +#define NR_RESETS 6 + +struct clk_dvp { + struct clk *clks[NR_CLOCKS]; + struct clk_onecell_data clk_data; + struct reset_simple_data reset; +}; + +static int clk_dvp_probe(struct platform_device *pdev) +{ + struct resource *res; + struct clk_dvp *dvp; + void __iomem *base; + const char *parent; + int ret; + + dvp = devm_kzalloc(&pdev->dev, sizeof(*dvp), GFP_KERNEL); + if (!dvp) + return -ENOMEM; + platform_set_drvdata(pdev, dvp); + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(base)) + return PTR_ERR(base); + + dvp->reset.rcdev.owner = THIS_MODULE; + dvp->reset.rcdev.nr_resets = NR_RESETS; + dvp->reset.rcdev.ops = &reset_simple_ops; + dvp->reset.rcdev.of_node = pdev->dev.of_node; + dvp->reset.membase = base + DVP_HT_RPI_SW_INIT; + spin_lock_init(&dvp->reset.lock); + + ret = reset_controller_register(&dvp->reset.rcdev); + if (ret) + return ret; + + parent = of_clk_get_parent_name(pdev->dev.of_node, 0); + if (!parent) + goto unregister_reset; + + dvp->clks[0] = clk_register_gate(&pdev->dev, "hdmi0-108MHz", + parent, CLK_IS_CRITICAL, + base + DVP_HT_RPI_MISC_CONFIG, 3, + CLK_GATE_SET_TO_DISABLE, &dvp->reset.lock); + if (IS_ERR(dvp->clks[0])) { + ret = PTR_ERR(dvp->clks[0]); + goto unregister_reset; + } + + dvp->clks[1] = clk_register_gate(&pdev->dev, "hdmi1-108MHz", + parent, CLK_IS_CRITICAL, + base + DVP_HT_RPI_MISC_CONFIG, 4, + CLK_GATE_SET_TO_DISABLE, &dvp->reset.lock); + if (IS_ERR(dvp->clks[1])) { + ret = PTR_ERR(dvp->clks[1]); + goto unregister_clk0; + } + + dvp->clk_data.clks = dvp->clks; + dvp->clk_data.clk_num = NR_CLOCKS; + of_clk_add_provider(pdev->dev.of_node, of_clk_src_onecell_get, + &dvp->clk_data); + + return 0; + + +unregister_clk0: + clk_unregister_gate(dvp->clks[0]); + +unregister_reset: + reset_controller_unregister(&dvp->reset.rcdev); + return ret; +}; + +static int clk_dvp_remove(struct platform_device *pdev) +{ + struct clk_dvp *dvp = platform_get_drvdata(pdev); + + clk_unregister_gate(dvp->clks[1]); + clk_unregister_gate(dvp->clks[0]); + reset_controller_unregister(&dvp->reset.rcdev); + + return 0; +} + +static const struct of_device_id clk_dvp_dt_ids[] = { + { .compatible = "brcm,brcm2711-dvp", }, + { /* sentinel */ }, +}; + +static struct platform_driver clk_dvp_driver = { + .probe = clk_dvp_probe, + .remove = clk_dvp_remove, + .driver = { + .name = "brcm2711-dvp", + .of_match_table = clk_dvp_dt_ids, + }, +}; +module_platform_driver(clk_dvp_driver);