Hi,
this patch allows one to set the rate of clocks without id fields from
debugfs. It also supports round_rate testing via debugfs also.
This is not for merging, at least not yet. But people out there who are
hacking on OMAP clock code may find it useful.
Here's an example:
mount -t debugfs none /debug
cd /debug/clock/virt_26m_ck/osc_sys_ck/sys_ck/dpll3_ck/dpll3_m2_ck
echo -n 166666666 > roundrate
echo -n 165941176 > rate
echo -n 331882352 > rate
- Paul
---
arch/arm/plat-omap/clock.c | 119 ++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 118 insertions(+), 1 deletions(-)
diff --git a/arch/arm/plat-omap/clock.c b/arch/arm/plat-omap/clock.c
index c2e741d..5873f38 100644
--- a/arch/arm/plat-omap/clock.c
+++ b/arch/arm/plat-omap/clock.c
@@ -23,6 +23,7 @@
#include <linux/platform_device.h>
#include <linux/cpufreq.h>
#include <linux/debugfs.h>
+#include <linux/uaccess.h>
#include <asm/io.h>
@@ -418,6 +419,115 @@ int __init clk_init(struct clk_functions * custom_clocks)
*/
static struct dentry *clk_debugfs_root;
+#define RBUFSIZE 11 /* strlen(2^sizeof(unsigned long)) + 1 */
+
+static ssize_t clk_debugfs_rate_read(struct file *f, char __user *userbuf,
+ size_t count, loff_t *offs)
+{
+ struct clk *clk;
+ char buf[RBUFSIZE];
+ ssize_t ssize;
+
+ /*
+ * XXX This is not going to work for clocks with an id number
+ * appended
+ */
+ clk = clk_get(NULL, f->f_dentry->d_parent->d_name.name);
+ if (!clk) {
+ pr_err("Cannot find clock named %s",
+ f->f_dentry->d_parent->d_name.name);
+ return -EINVAL;
+ }
+
+ ssize = snprintf(buf, RBUFSIZE, "%lu", clk_get_rate(clk));
+
+ return simple_read_from_buffer(userbuf, count, offs, buf, ssize);
+}
+
+static ssize_t clk_debugfs_rate_write(struct file *f,
+ const char __user *userbuf,
+ size_t count, loff_t *offs)
+{
+ char buf[RBUFSIZE];
+ int buf_size;
+ unsigned long val;
+ int rrval;
+ struct clk *clk;
+
+ buf_size = min(count, (size_t)(RBUFSIZE - 1));
+ if (copy_from_user(buf, userbuf, buf_size))
+ return -EFAULT;
+ buf[buf_size] = '\0';
+
+ /*
+ * XXX This is not going to work for clocks with an id number
+ * appended
+ */
+ clk = clk_get(NULL, f->f_dentry->d_parent->d_name.name);
+ if (!clk) {
+ pr_err("Cannot find clock named %s",
+ f->f_dentry->d_parent->d_name.name);
+ return -EINVAL;
+ }
+
+ if (sscanf(buf, "%lu", &val) == 1) {
+ rrval = clk_set_rate(clk, val);
+
+ pr_info("clk: clk_set_rate(%s, %ld) returns %d\n", clk->name,
+ val, rrval);
+
+ return buf_size;
+ }
+ return -EINVAL;
+}
+
+static const struct file_operations clk_debugfs_rate_fops = {
+ .read = &clk_debugfs_rate_read,
+ .write = &clk_debugfs_rate_write,
+};
+
+
+static ssize_t clk_debugfs_roundrate_write(struct file *f,
+ const char __user *userbuf,
+ size_t count, loff_t *offs)
+{
+ char buf[RBUFSIZE];
+ int buf_size;
+ unsigned long val;
+ int rrval;
+ struct clk *clk;
+
+ buf_size = min(count, (size_t)(RBUFSIZE - 1));
+ if (copy_from_user(buf, userbuf, buf_size))
+ return -EFAULT;
+ buf[buf_size] = '\0';
+
+ /*
+ * XXX This is not going to work for clocks with an id number
+ * appended
+ */
+ clk = clk_get(NULL, f->f_dentry->d_parent->d_name.name);
+ if (!clk) {
+ pr_err("Cannot find clock named %s",
+ f->f_dentry->d_parent->d_name.name);
+ return -EINVAL;
+ }
+
+ if (sscanf(buf, "%lu", &val) == 1) {
+ rrval = clk_round_rate(clk, val);
+
+ pr_info("clk: %s: rounded rate from %ld to %ld\n",
+ clk->name, val, rrval);
+
+ return buf_size;
+ }
+ return -EINVAL;
+}
+
+static const struct file_operations clk_debugfs_roundrate_fops = {
+ .write = &clk_debugfs_roundrate_write,
+};
+
static int clk_debugfs_register_one(struct clk *c)
{
int err;
@@ -439,7 +549,14 @@ static int clk_debugfs_register_one(struct clk *c)
err = PTR_ERR(d);
goto err_out;
}
- d = debugfs_create_u32("rate", S_IRUGO, c->dent, (u32 *)&c->rate);
+ d = debugfs_create_file("rate", S_IRUGO | S_IWUSR, c->dent,
+ NULL, &clk_debugfs_rate_fops);
+ if (IS_ERR(d)) {
+ err = PTR_ERR(d);
+ goto err_out;
+ }
+ d = debugfs_create_file("roundrate", S_IWUSR, c->dent,
+ NULL, &clk_debugfs_roundrate_fops);
if (IS_ERR(d)) {
err = PTR_ERR(d);
goto err_out;
--
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