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authorGrant Likely <grant.likely@secretlab.ca>2012-04-09 23:50:06 +0400
committerMike Turquette <mturquette@linaro.org>2012-07-12 04:58:45 +0400
commit766e6a4ec602d0c107553b91b3434fe9c03474f4 (patch)
treeaa9bbba36954d927e931cc50c6a28ef9cced571c /include/linux/clk.h
parenta613163dff04cbfcb7d66b06ef4a5f65498ee59b (diff)
downloadlinux-766e6a4ec602d0c107553b91b3434fe9c03474f4.tar.xz
clk: add DT clock binding support
Based on work 1st by Ben Herrenschmidt and Jeremy Kerr, then by Grant Likely, this patch adds support to clk_get to allow drivers to retrieve clock data from the device tree. Platforms scan for clocks in DT with of_clk_init and a match table, and the register a provider through of_clk_add_provider. The provider's clk_src_get function will be called when a device references the provider's OF node for a clock reference. v6 (Rob Herring): - Return error values instead of NULL to match clock framework expectations v5 (Rob Herring): - Move from drivers/of into common clock subsystem - Squashed "dt/clock: add a simple provider get function" and "dt/clock: add function to get parent clock name" - Rebase to 3.4-rc1 - Drop CONFIG_OF_CLOCK and just use CONFIG_OF - Add missing EXPORT_SYMBOL to various functions - s/clock-output-name/clock-output-names/ - Define that fixed-clock binding is a single output v4 (Rob Herring): - Rework for common clk subsystem - Add of_clk_get_parent_name function v3: - Clarified documentation v2: - fixed errant ';' causing compile error - Editorial fixes from Shawn Guo - merged in adding lookup to clkdev - changed property names to match established convention. After working with the binding a bit it really made more sense to follow the lead of 'reg', 'gpios' and 'interrupts' by making the input simply 'clocks' & 'clock-names' instead of 'clock-input-*', and to only use clock-output* for the producer nodes. (Sorry Shawn, this will mean you need to change some code, but it should be trivial) - Add ability to inherit clocks from parent nodes by using an empty 'clock-ranges' property. Useful for busses. I could use some feedback on the new property name, 'clock-ranges' doesn't feel right to me. Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Signed-off-by: Rob Herring <rob.herring@calxeda.com> Reviewed-by: Shawn Guo <shawn.guo@freescale.com> Cc: Sascha Hauer <kernel@pengutronix.de> Signed-off-by: Mike Turquette <mturquette@linaro.org>
Diffstat (limited to 'include/linux/clk.h')
-rw-r--r--include/linux/clk.h19
1 files changed, 19 insertions, 0 deletions
diff --git a/include/linux/clk.h b/include/linux/clk.h
index ad5c43e8ae8a..8b70342e7e0b 100644
--- a/include/linux/clk.h
+++ b/include/linux/clk.h
@@ -310,4 +310,23 @@ struct clk *clk_get_sys(const char *dev_id, const char *con_id);
int clk_add_alias(const char *alias, const char *alias_dev_name, char *id,
struct device *dev);
+struct device_node;
+struct of_phandle_args;
+
+#ifdef CONFIG_OF
+struct clk *of_clk_get(struct device_node *np, int index);
+struct clk *of_clk_get_by_name(struct device_node *np, const char *name);
+struct clk *of_clk_get_from_provider(struct of_phandle_args *clkspec);
+#else
+static inline struct clk *of_clk_get(struct device_node *np, int index)
+{
+ return NULL;
+}
+static inline struct clk *of_clk_get_by_name(struct device_node *np,
+ const char *name)
+{
+ return NULL;
+}
+#endif
+
#endif