clk: exynos: add function for Samsung CMU ops->request

The request function performs a simple check if the clock with the
provided ID is present or not. This is done with a simple call to
clk_get_by_id(). A non-zero return value indicates that the requested
clock is not available.

In some cases, clk->dev points to the clock bank device instead of
the clock device. This pointer is therefore overwritten in order to
reference to the correct device instance.

Signed-off-by: Kaustabh Chakraborty <kauschluss@disroot.org>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>

diff --git a/drivers/clk/exynos/clk.c b/drivers/clk/exynos/clk.c
index a383298..a2c9f48 100644 (file)
--- a/drivers/clk/exynos/clk.c
+++ b/drivers/clk/exynos/clk.c
@@ -10,6 +10,19 @@
 #include <dm.h>
 #include "clk.h"
 
+int samsung_clk_request(struct clk *clk)
+{
+       struct clk *c;
+       int ret;
+
+       ret = clk_get_by_id(clk->id, &c);
+       if (ret)
+               return ret;
+
+       clk->dev = c->dev;
+       return 0;
+}
+
 static void
 samsung_clk_register_fixed_rate(struct udevice *dev, void __iomem *base,
                                unsigned int cmu_id,

diff --git a/drivers/clk/exynos/clk.h b/drivers/clk/exynos/clk.h
index e53dcc6..c25b7cb 100644 (file)
--- a/drivers/clk/exynos/clk.h
+++ b/drivers/clk/exynos/clk.h
@@ -9,10 +9,13 @@
 #ifndef __EXYNOS_CLK_H
 #define __EXYNOS_CLK_H
 
+#include <clk.h>
 #include <errno.h>
 #include <linux/clk-provider.h>
 #include "clk-pll.h"
 
+int samsung_clk_request(struct clk *clk);
+
 #define _SAMSUNG_CLK_OPS(_name, _cmu)                                  \
 static int _name##_of_xlate(struct clk *clk,                           \
                            struct ofnode_phandle_args *args)           \
@@ -37,6 +40,7 @@ static const struct clk_ops _name##_clk_ops = {                               \
        .enable = ccf_clk_enable,                                       \
        .disable = ccf_clk_disable,                                     \
        .of_xlate = _name##_of_xlate,                                   \
+       .request = samsung_clk_request,                                 \
 }
 
 /**