clk: add clock-indices support

Add a property called clock-indices to allow clock-output-names
to be used where the index used to lookup a clock is not a 1:1
mapping to the array position in the clock-output-names

Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk>
Signed-off-by: Mike Turquette <mturquette@linaro.org>
This commit is contained in:
Ben Dooks 2014-02-13 18:02:49 +00:00 committed by Mike Turquette
parent 29d43ddf73
commit 7a0fc1a3df
2 changed files with 36 additions and 1 deletions

View File

@ -44,6 +44,23 @@ For example:
clocks by index. The names should reflect the clock output signal
names for the device.
clock-indices: If the identifyng number for the clocks in the node
is not linear from zero, then the this mapping allows
the mapping of identifiers into the clock-output-names
array.
For example, if we have two clocks <&oscillator 1> and <&oscillator 3>:
oscillator {
compatible = "myclocktype";
#clock-cells = <1>;
clock-indices = <1>, <3>;
clock-output-names = "clka", "clkb";
}
This ensures we do not have any empty nodes in clock-output-names
==Clock consumers==
Required properties:

View File

@ -2496,8 +2496,12 @@ EXPORT_SYMBOL_GPL(of_clk_get_parent_count);
const char *of_clk_get_parent_name(struct device_node *np, int index)
{
struct of_phandle_args clkspec;
struct property *prop;
const char *clk_name;
const __be32 *vp;
u32 pv;
int rc;
int count;
if (index < 0)
return NULL;
@ -2507,8 +2511,22 @@ const char *of_clk_get_parent_name(struct device_node *np, int index)
if (rc)
return NULL;
index = clkspec.args_count ? clkspec.args[0] : 0;
count = 0;
/* if there is an indices property, use it to transfer the index
* specified into an array offset for the clock-output-names property.
*/
of_property_for_each_u32(clkspec.np, "clock-indices", prop, vp, pv) {
if (index == pv) {
index = count;
break;
}
count++;
}
if (of_property_read_string_index(clkspec.np, "clock-output-names",
clkspec.args_count ? clkspec.args[0] : 0,
index,
&clk_name) < 0)
clk_name = clkspec.np->name;