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authorGeert Uytterhoeven <geert+renesas@glider.be>2015-04-15 16:17:20 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2015-04-15 16:35:23 -0700
commit900cca2944254edd2d54dc181629314d3177a4af (patch)
tree3e1688e275f749d53d6b276ed00260243d254e0c /lib
parente8a7ba5f5c8c0c94c0c7f1bcd53c0289560c7446 (diff)
downloadlinux-900cca2944254edd2d54dc181629314d3177a4af.tar.gz
lib/vsprintf: add %pC{,n,r} format specifiers for clocks
Add format specifiers for printing struct clk: - '%pC' or '%pCn': name (Common Clock Framework) or address (legacy clock framework) of the clock, - '%pCr': rate of the clock. [akpm@linux-foundation.org: omit code if !CONFIG_HAVE_CLK] Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Mike Turquette <mturquette@linaro.org> Cc: Stephen Boyd <sboyd@codeaurora.org> Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib')
-rw-r--r--lib/vsprintf.c37
1 files changed, 37 insertions, 0 deletions
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 2753f9261115..3ab8c9cf3980 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -17,6 +17,7 @@
*/
#include <stdarg.h>
+#include <linux/clk-provider.h>
#include <linux/module.h> /* for KSYM_SYMBOL_LEN */
#include <linux/types.h>
#include <linux/string.h>
@@ -1315,6 +1316,30 @@ char *address_val(char *buf, char *end, const void *addr,
return number(buf, end, num, spec);
}
+static noinline_for_stack
+char *clock(char *buf, char *end, struct clk *clk, struct printf_spec spec,
+ const char *fmt)
+{
+ if (!IS_ENABLED(CONFIG_HAVE_CLK) || !clk)
+ return string(buf, end, NULL, spec);
+
+ switch (fmt[1]) {
+ case 'r':
+ return number(buf, end, clk_get_rate(clk), spec);
+
+ case 'n':
+ default:
+#ifdef CONFIG_COMMON_CLK
+ return string(buf, end, __clk_get_name(clk), spec);
+#else
+ spec.base = 16;
+ spec.field_width = sizeof(unsigned long) * 2 + 2;
+ spec.flags |= SPECIAL | SMALL | ZEROPAD;
+ return number(buf, end, (unsigned long)clk, spec);
+#endif
+ }
+}
+
int kptr_restrict __read_mostly;
/*
@@ -1397,6 +1422,11 @@ int kptr_restrict __read_mostly;
* (default assumed to be phys_addr_t, passed by reference)
* - 'd[234]' For a dentry name (optionally 2-4 last components)
* - 'D[234]' Same as 'd' but for a struct file
+ * - 'C' For a clock, it prints the name (Common Clock Framework) or address
+ * (legacy clock framework) of the clock
+ * - 'Cn' For a clock, it prints the name (Common Clock Framework) or address
+ * (legacy clock framework) of the clock
+ * - 'Cr' For a clock, it prints the current rate of the clock
*
* Note: The difference between 'S' and 'F' is that on ia64 and ppc64
* function pointers are really function descriptors, which contain a
@@ -1541,6 +1571,8 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr,
return address_val(buf, end, ptr, spec, fmt);
case 'd':
return dentry_name(buf, end, ptr, spec, fmt);
+ case 'C':
+ return clock(buf, end, ptr, spec, fmt);
case 'D':
return dentry_name(buf, end,
((const struct file *)ptr)->f_path.dentry,
@@ -1785,6 +1817,11 @@ qualifier:
* %*pE[achnops] print an escaped buffer
* %*ph[CDN] a variable-length hex string with a separator (supports up to 64
* bytes of the input)
+ * %pC output the name (Common Clock Framework) or address (legacy clock
+ * framework) of a clock
+ * %pCn output the name (Common Clock Framework) or address (legacy clock
+ * framework) of a clock
+ * %pCr output the current rate of a clock
* %n is ignored
*
* ** Please update Documentation/printk-formats.txt when making changes **