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Subject[PATCH 18/33 v2] 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.

Cc: Mike Turquette <mturquette@linaro.org>
Cc: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

diff --git a/drivers/clk/ux500/u8500_clk.c b/drivers/clk/ux500/u8500_clk.c
index ef948ff..c2d9a1c 100644
--- a/drivers/clk/ux500/u8500_clk.c
+++ b/drivers/clk/ux500/u8500_clk.c
@@ -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);
+}
+
const static struct of_device_id u8500_clk_of_match[] = {
{ .compatible = "stericsson,u8500-clks", },
{ },

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