mfd: Add support for sun6i PRCM (Power/Reset/Clock Management) unit (d58603cc) · Commits · 戴 / test

drivers/mfd/Kconfig

+8 −0

Original line number	Diff line number	Diff line
		@@ -732,6 +732,14 @@ config MFD_STA2X11
		select MFD_CORE
		select REGMAP_MMIO

		config MFD_SUN6I_PRCM
		bool "Allwinner A31 PRCM controller"
		depends on ARCH_SUNXI
		select MFD_CORE
		help
		Support for the PRCM (Power/Reset/Clock Management) unit available
		in A31 SoC.

		config MFD_SYSCON
		bool "System Controller Register R/W Based on Regmap"
		select REGMAP_MMIO

drivers/mfd/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -29,6 +29,7 @@ obj-$(CONFIG_MFD_STA2X11) += sta2x11-mfd.o
		obj-$(CONFIG_MFD_STMPE) += stmpe.o
		obj-$(CONFIG_STMPE_I2C) += stmpe-i2c.o
		obj-$(CONFIG_STMPE_SPI) += stmpe-spi.o
		obj-$(CONFIG_MFD_SUN6I_PRCM) += sun6i-prcm.o
		obj-$(CONFIG_MFD_TC3589X) += tc3589x.o
		obj-$(CONFIG_MFD_T7L66XB) += t7l66xb.o tmio_core.o
		obj-$(CONFIG_MFD_TC6387XB) += tc6387xb.o tmio_core.o

drivers/mfd/sun6i-prcm.c

0 → 100644

+134 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2014 Free Electrons
		*
		* License Terms: GNU General Public License v2
		* Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
		*
		* Allwinner PRCM (Power/Reset/Clock Management) driver
		*
		*/

		#include <linux/mfd/core.h>
		#include <linux/module.h>
		#include <linux/of.h>

		struct prcm_data {
		int nsubdevs;
		const struct mfd_cell *subdevs;
		};

		static const struct resource sun6i_a31_ar100_clk_res[] = {
		{
		.start = 0x0,
		.end = 0x3,
		.flags = IORESOURCE_MEM,
		},
		};

		static const struct resource sun6i_a31_apb0_clk_res[] = {
		{
		.start = 0xc,
		.end = 0xf,
		.flags = IORESOURCE_MEM,
		},
		};

		static const struct resource sun6i_a31_apb0_gates_clk_res[] = {
		{
		.start = 0x28,
		.end = 0x2b,
		.flags = IORESOURCE_MEM,
		},
		};

		static const struct resource sun6i_a31_apb0_rstc_res[] = {
		{
		.start = 0xb0,
		.end = 0xb3,
		.flags = IORESOURCE_MEM,
		},
		};

		static const struct mfd_cell sun6i_a31_prcm_subdevs[] = {
		{
		.name = "sun6i-a31-ar100-clk",
		.of_compatible = "allwinner,sun6i-a31-ar100-clk",
		.num_resources = ARRAY_SIZE(sun6i_a31_ar100_clk_res),
		.resources = sun6i_a31_ar100_clk_res,
		},
		{
		.name = "sun6i-a31-apb0-clk",
		.of_compatible = "allwinner,sun6i-a31-apb0-clk",
		.num_resources = ARRAY_SIZE(sun6i_a31_apb0_clk_res),
		.resources = sun6i_a31_apb0_clk_res,
		},
		{
		.name = "sun6i-a31-apb0-gates-clk",
		.of_compatible = "allwinner,sun6i-a31-apb0-gates-clk",
		.num_resources = ARRAY_SIZE(sun6i_a31_apb0_gates_clk_res),
		.resources = sun6i_a31_apb0_gates_clk_res,
		},
		{
		.name = "sun6i-a31-apb0-clock-reset",
		.of_compatible = "allwinner,sun6i-a31-clock-reset",
		.num_resources = ARRAY_SIZE(sun6i_a31_apb0_rstc_res),
		.resources = sun6i_a31_apb0_rstc_res,
		},
		};

		static const struct prcm_data sun6i_a31_prcm_data = {
		.nsubdevs = ARRAY_SIZE(sun6i_a31_prcm_subdevs),
		.subdevs = sun6i_a31_prcm_subdevs,
		};

		static const struct of_device_id sun6i_prcm_dt_ids[] = {
		{
		.compatible = "allwinner,sun6i-a31-prcm",
		.data = &sun6i_a31_prcm_data,
		},
		{ /* sentinel */ },
		};

		static int sun6i_prcm_probe(struct platform_device *pdev)
		{
		struct device_node *np = pdev->dev.of_node;
		const struct of_device_id *match;
		const struct prcm_data *data;
		struct resource *res;
		int ret;

		match = of_match_node(sun6i_prcm_dt_ids, np);
		if (!match)
		return -EINVAL;

		data = match->data;

		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
		if (!res) {
		dev_err(&pdev->dev, "no prcm memory region provided\n");
		return -ENOENT;
		}

		ret = mfd_add_devices(&pdev->dev, 0, data->subdevs, data->nsubdevs,
		res, -1, NULL);
		if (ret) {
		dev_err(&pdev->dev, "failed to add subdevices\n");
		return ret;
		}

		return 0;
		}

		static struct platform_driver sun6i_prcm_driver = {
		.driver = {
		.name = "sun6i-prcm",
		.owner = THIS_MODULE,
		.of_match_table = sun6i_prcm_dt_ids,
		},
		.probe = sun6i_prcm_probe,
		};
		module_platform_driver(sun6i_prcm_driver);

		MODULE_AUTHOR("Boris BREZILLON <boris.brezillon@free-electrons.com>");
		MODULE_DESCRIPTION("Allwinner sun6i PRCM driver");
		MODULE_LICENSE("GPL v2");

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