mirros/rockchip-kernel
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

clk: add a fixed factor clock

Browse Source 
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>
This commit is contained in:
Sascha Hauer
2012-05-03 15:36:14 +05:30
committed by Mike Turquette
parent 31df9db995
commit f0948f59db
4 changed files with 139 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

23
include/linux/clk-provider.h
View File

@@ -276,6 +276,29 @@ struct clk *clk_register_mux(struct device *dev, const char *name,
void __iomem *reg, u8 shift, u8 width,
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