forked from luck/tmp_suning_uos_patched
75f83d06c3
Currently clock providers defined in the DT are not registered on i.MX5 platforms since of_clk_init() is not called. This is not a problem for the SOC's own clocks, which are registered in code, but prevents the DT being used to define clocks for external hardware. Fix this by calling of_clk_init() and actually using the DT to obtain the 4 SOC fixed clocks. These are already defined in the DT but were previously just used to manually obtain the rate. Fall back to the old scheme for non DT platforms. Since the same method may be useful for other i.MX platforms implement the imx_obtain_fixed_clock() function in common code. Actually changing other i.MX platforms to use this should be done later by someone with access to the appropriate hardware. Signed-off-by: Martin Fuzzey <mfuzzey@parkeon.com> Tested-by: Fabio Estevam <fabio.estevam@freescale.com> Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
40 lines
814 B
C
40 lines
814 B
C
#include <linux/clk.h>
|
|
#include <linux/err.h>
|
|
#include <linux/of.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/spinlock.h>
|
|
#include "clk.h"
|
|
|
|
DEFINE_SPINLOCK(imx_ccm_lock);
|
|
|
|
static struct clk * __init imx_obtain_fixed_clock_from_dt(const char *name)
|
|
{
|
|
struct of_phandle_args phandle = {0};
|
|
struct clk *clk = ERR_PTR(-ENODEV);
|
|
char *path;
|
|
|
|
path = kasprintf(GFP_KERNEL, "/clocks/%s", name);
|
|
if (!path)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
phandle.np = of_find_node_by_path(path);
|
|
kfree(path);
|
|
|
|
if (phandle.np) {
|
|
clk = of_clk_get_from_provider(&phandle);
|
|
of_node_put(phandle.np);
|
|
}
|
|
return clk;
|
|
}
|
|
|
|
struct clk * __init imx_obtain_fixed_clock(
|
|
const char *name, unsigned long rate)
|
|
{
|
|
struct clk *clk;
|
|
|
|
clk = imx_obtain_fixed_clock_from_dt(name);
|
|
if (IS_ERR(clk))
|
|
clk = imx_clk_fixed(name, rate);
|
|
return clk;
|
|
}
|