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clk: ux500: Add a 2-cell Device Tree parser for obtaining PRCC clocks 

PRCC (peripheral and kernel) clocks are specified using a property tuple
<&phandle base bit>, where 'base' is the peripheral (1, 2, 3, 5 or 6),
and bit is read-in value into that peripheral stipulated by the hardware
specification.

Acked-by: Mike Turquette <mturquette@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Lee Jones 2013-07-22 13:13:01 +01:00 committed by Linus Walleij
parent dec759d8ef
commit b4bdc81b5b
1 changed files with 22 additions and 0 deletions
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22
drivers/clk/ux500/u8500_of_clk.c
View File

@ -15,6 +15,28 @@
#include <linux/platform_data/clk-ux500.h>
#include "clk.h"
#define PRCC_SHOW(clk, base, bit) \
clk[(base * PRCC_PERIPHS_PER_CLUSTER) + bit]
struct clk *ux500_twocell_get(struct of_phandle_args *clkspec, void *data)
{
struct clk **clk_data = data;
unsigned int base, bit;
if (clkspec->args_count != 2)
return ERR_PTR(-EINVAL);
base = clkspec->args[0];
bit = clkspec->args[1];
if (base != 1 && base != 2 && base != 3 && base != 5 && base != 6) {
pr_err("%s: invalid PRCC base %d\n", __func__, base);
return ERR_PTR(-EINVAL);
}
return PRCC_SHOW(clk_data, base, bit);
}
static const struct of_device_id u8500_clk_of_match[] = {
{ .compatible = "stericsson,u8500-clks", },
{ },