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clk: sunxi: Add A23 APB0 divider clock support

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The A23 has an almost identical PRCM clock tree. The difference in
the APB0 clock is the smallest divisor is 1, instead of 2.

This patch adds a separate sun8i-a23-apb0-clk driver to support it.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
This commit is contained in:
Chen-Yu Tsai 2014-07-03 22:55:41 +08:00 committed by Maxime Ripard
parent 515c1a4bdc
commit 57a1fbf284
3 changed files with 72 additions and 1 deletions
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1
Documentation/devicetree/bindings/clock/sunxi.txt
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@ -28,6 +28,7 @@ Required properties:
"allwinner,sun8i-a23-ahb1-gates-clk" - for the AHB1 gates on A23
"allwinner,sun4i-a10-apb0-clk" - for the APB0 clock
"allwinner,sun6i-a31-apb0-clk" - for the APB0 clock on A31
"allwinner,sun8i-a23-apb0-clk" - for the APB0 clock on A23
"allwinner,sun4i-a10-apb0-gates-clk" - for the APB0 gates on A10
"allwinner,sun5i-a13-apb0-gates-clk" - for the APB0 gates on A13
"allwinner,sun5i-a10s-apb0-gates-clk" - for the APB0 gates on A10s

4
drivers/clk/sunxi/Makefile
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@ -6,4 +6,6 @@ obj-y += clk-sunxi.o clk-factors.o
obj-y += clk-a10-hosc.o
obj-y += clk-a20-gmac.o
obj-$(CONFIG_MFD_SUN6I_PRCM) += clk-sun6i-ar100.o clk-sun6i-apb0.o clk-sun6i-apb0-gates.o
obj-$(CONFIG_MFD_SUN6I_PRCM) += \
clk-sun6i-ar100.o clk-sun6i-apb0.o clk-sun6i-apb0-gates.o \
clk-sun8i-apb0.o

68
drivers/clk/sunxi/clk-sun8i-apb0.c Normal file
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@ -0,0 +1,68 @@
/*
* Copyright (C) 2014 Chen-Yu Tsai
* Author: Chen-Yu Tsai <wens@csie.org>
*
* Allwinner A23 APB0 clock driver
*
* License Terms: GNU General Public License v2
*
* Based on clk-sun6i-apb0.c
* Allwinner A31 APB0 clock driver
*
* Copyright (C) 2014 Free Electrons
* Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
*
*/
#include <linux/clk-provider.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
static int sun8i_a23_apb0_clk_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
const char *clk_name = np->name;
const char *clk_parent;
struct resource *r;
void __iomem *reg;
struct clk *clk;
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
reg = devm_ioremap_resource(&pdev->dev, r);
if (IS_ERR(reg))
return PTR_ERR(reg);
clk_parent = of_clk_get_parent_name(np, 0);
if (!clk_parent)
return -EINVAL;
of_property_read_string(np, "clock-output-names", &clk_name);
/* The A23 APB0 clock is a standard 2 bit wide divider clock */
clk = clk_register_divider(&pdev->dev, clk_name, clk_parent, 0, reg,
0, 2, CLK_DIVIDER_POWER_OF_TWO, NULL);
if (IS_ERR(clk))
return PTR_ERR(clk);
return of_clk_add_provider(np, of_clk_src_simple_get, clk);
}
const struct of_device_id sun8i_a23_apb0_clk_dt_ids[] = {
{ .compatible = "allwinner,sun8i-a23-apb0-clk" },
{ /* sentinel */ }
};
static struct platform_driver sun8i_a23_apb0_clk_driver = {
.driver = {
.name = "sun8i-a23-apb0-clk",
.owner = THIS_MODULE,
.of_match_table = sun8i_a23_apb0_clk_dt_ids,
},
.probe = sun8i_a23_apb0_clk_probe,
};
module_platform_driver(sun8i_a23_apb0_clk_driver);
MODULE_AUTHOR("Chen-Yu Tsai <wens@csie.org>");
MODULE_DESCRIPTION("Allwinner A23 APB0 clock Driver");
MODULE_LICENSE("GPL v2");