linux/drivers/mfd/sun6i-prcm.c
Chen-Yu Tsai 4eb9560b8f mfd: sun6i-prcm: Add support for Allwinner A23 PRCM
The Allwinner A23 SoC has a PRCM unit like the previous A31 SoC.
The differences are the AR100 clock can no longer be modified,
the APB0 clock has different divisors, and some clock gates are
gone.

This patch adds a compatible with a modified subdevice list for
the A23.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
2014-07-21 16:54:25 +01:00

165 lines
3.8 KiB
C

/*
* 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",
.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");