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/*
* 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 mfd_cell sun8i_a23_prcm_subdevs[] = {
{
.name = "sun8i-a23-apb0-clk",
.of_compatible = "allwinner,sun8i-a23-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,sun8i-a23-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 prcm_data sun8i_a23_prcm_data = {
.nsubdevs = ARRAY_SIZE(sun8i_a23_prcm_subdevs),
.subdevs = sun8i_a23_prcm_subdevs,
};
static const struct of_device_id sun6i_prcm_dt_ids[] = {
{
.compatible = "allwinner,sun6i-a31-prcm",
.data = &sun6i_a31_prcm_data,
},
{
.compatible = "allwinner,sun8i-a23-prcm",
.data = &sun8i_a23_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",
.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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