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Subject[PATCH 2/3] Driver for user access to internal clocks
Specific for Samsung S3C24xx platforms
Allows any driver to get a device specific clock.
It recognizes also the form clkname.X

Signed-off-by: Davide Rizzo <elpa-rizzo@gmail.com>
---
diff -urNp linux-2.6.28/arch/arm/plat-s3c24xx/clock.c
linux-2.6.28.elpa/arch/arm/plat-s3c24xx/clock.c
--- linux-2.6.28/arch/arm/plat-s3c24xx/clock.c 2008-12-25
00:26:37.000000000 +0100
+++ linux-2.6.28.elpa/arch/arm/plat-s3c24xx/clock.c 2009-01-07
19:25:07.000000000 +0100
@@ -67,11 +67,19 @@ static int clk_null_enable(struct clk *c

struct clk *clk_get(struct device *dev, const char *id)
{
+ long idno;
+ char *name = (char *)id;
+ char *dotpos = strrchr(id, '.');
struct clk *p;
struct clk *clk = ERR_PTR(-ENOENT);
- int idno;

- if (dev == NULL || dev->bus != &platform_bus_type)
+ if (dotpos) {
+ int err = strict_strtol(dotpos + 1, 10, &idno);
+ if (err)
+ return ERR_PTR(err);
+ name = kstrdup(id, GFP_KERNEL);
+ name[dotpos - id] = '\0';
+ } else if (dev == NULL || dev->bus != &platform_bus_type)
idno = -1;
else
idno = to_platform_device(dev)->id;
@@ -80,7 +88,7 @@ struct clk *clk_get(struct device *dev,

list_for_each_entry(p, &clocks, list) {
if (p->id == idno &&
- strcmp(id, p->name) == 0 &&
+ strcmp(name, p->name) == 0 &&
try_module_get(p->owner)) {
clk = p;
break;
@@ -92,7 +100,7 @@ struct clk *clk_get(struct device *dev,

if (IS_ERR(clk)) {
list_for_each_entry(p, &clocks, list) {
- if (p->id == -1 && strcmp(id, p->name) == 0 &&
+ if (p->id == -1 && strcmp(name, p->name) == 0 &&
try_module_get(p->owner)) {
clk = p;
break;
@@ -101,6 +109,9 @@ struct clk *clk_get(struct device *dev,
}

mutex_unlock(&clocks_mutex);
+
+ if (dotpos)
+ kfree(name);
return clk;
}

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