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authorSascha Hauer <s.hauer@pengutronix.de>2012-05-03 15:36:14 +0530
committerMike Turquette <mturquette@linaro.org>2012-05-08 14:13:25 -0700
commitf0948f59dbc8e725a96ba16da666e8f5cdd43ba8 (patch)
tree9343cecfdb735b4b9c327edea65e71801b5c3efe /include/linux/clk-provider.h
parent31df9db99549cd29bbe5e32da4492970e6f97191 (diff)
clk: add a fixed factor clock
Having fixed factors/dividers in hardware is a common pattern, so add a basic clock type doing this. It basically describes a fixed factor clock using a nominator and a denominator. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Reviewed-by: Viresh Kumar <viresh.kumar@st.com> Tested-by: Shawn Guo <shawn.guo@linaro.org> [mturquette@linaro.org: constify parent_names in static init macro] [mturquette@linaro.org: copy/paste bug from mux in static init macro] [mturquette@linaro.org: fix error handling in clk_register_fixed_factor] [mturquette@linaro.org: improve division accuracy; thanks to Saravana] Signed-off-by: Mike Turquette <mturquette@linaro.org>
Diffstat (limited to 'include/linux/clk-provider.h')
-rw-r--r--include/linux/clk-provider.h23
1 files changed, 23 insertions, 0 deletions
diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
index 5db3412106b3..c1c23b9ec368 100644
--- a/include/linux/clk-provider.h
+++ b/include/linux/clk-provider.h
@@ -277,6 +277,29 @@ struct clk *clk_register_mux(struct device *dev, const char *name,
u8 clk_mux_flags, spinlock_t *lock);
/**
+ * struct clk_fixed_factor - fixed multiplier and divider clock
+ *
+ * @hw: handle between common and hardware-specific interfaces
+ * @mult: multiplier
+ * @div: divider
+ *
+ * Clock with a fixed multiplier and divider. The output frequency is the
+ * parent clock rate divided by div and multiplied by mult.
+ * Implements .recalc_rate, .set_rate and .round_rate
+ */
+
+struct clk_fixed_factor {
+ struct clk_hw hw;
+ unsigned int mult;
+ unsigned int div;
+};
+
+extern struct clk_ops clk_fixed_factor_ops;
+struct clk *clk_register_fixed_factor(struct device *dev, const char *name,
+ const char *parent_name, unsigned long flags,
+ unsigned int mult, unsigned int div);
+
+/**
* clk_register - allocate a new clock, register it and return an opaque cookie
* @dev: device that is registering this clock
* @hw: link to hardware-specific clock data