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Commit d58603cc authored by Boris Brezillon's avatar Boris Brezillon Committed by Lee Jones
Browse files

mfd: Add support for sun6i PRCM (Power/Reset/Clock Management) unit 



The PRCM (Power/Reset/Clock Management) block exposes several subdevices
in different subsystems (clk, reset ...)

Add basic support for the PRCM unit with clk (AR100, AHB0, and APB0 clks)
and reset controller subdevices.

Other subdevices might be added later (if needed).

Signed-off-by: default avatarBoris BREZILLON <boris.brezillon@free-electrons.com>
Acked-by: default avatarMaxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: default avatarLee Jones <lee.jones@linaro.org>
parent e4e3d1b0

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");