From: Geert Uytterhoeven <[email protected]> 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.
Signed-off-by: Geert Uytterhoeven <[email protected]> --- Documentation/printk-formats.txt | 12 ++++++++++++ lib/vsprintf.c | 37 +++++++++++++++++++++++++++++++++++++ 2 files changed, 49 insertions(+) diff --git a/Documentation/printk-formats.txt b/Documentation/printk-formats.txt index 11413036a63d1f7a..c287a9cec42cd20b 100644 --- a/Documentation/printk-formats.txt +++ b/Documentation/printk-formats.txt @@ -269,6 +269,18 @@ struct va_format: Passed by reference. +struct clk: + + %pC pll1 + %pCn pll1 + %pCr 1560000000 + + For printing struct clk structures. '%pC' and '%pCn' print the name + (Common Clock Framework) or address (legacy clock framework) of the + structure; '%pCr' prints the current clock rate. + + Passed by reference. + Thank you for your cooperation and attention. diff --git a/lib/vsprintf.c b/lib/vsprintf.c index 86907982a7702331..c0ae8ad034efd2aa 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> @@ -1337,6 +1338,30 @@ char *comm_name(char *buf, char *end, struct task_struct *tsk, return string(buf, end, name, spec); } +static noinline_for_stack +char *clock(char *buf, char *end, struct clk *clk, struct printf_spec spec, + const char *fmt) +{ + if (!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; /* @@ -1420,6 +1445,11 @@ int kptr_restrict __read_mostly; * - 'd[234]' For a dentry name (optionally 2-4 last components) * - 'D[234]' Same as 'd' but for a struct file * - 'T' task_struct->comm + * - '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 @@ -1570,6 +1600,8 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr, spec, fmt); case 'T': return comm_name(buf, end, ptr, spec, fmt); + case 'C': + return clock(buf, end, ptr, spec, fmt); } spec.flags |= SMALL; if (spec.field_width == -1) { @@ -1818,6 +1850,11 @@ 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 ** -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
