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clk: let of_clk_get_parent_name() fail for invalid clock-indices

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Currently, of_clk_get_parent_name() returns a wrong parent clock name
when "clock-indices" property exists and the target index is not
found in the property.  In this case, NULL should be returned.

For example,

        oscillator {
                compatible = "myclocktype";
                #clock-cells = <1>;
                clock-indices = <1>, <3>;
                clock-output-names = "clka", "clkb";
        };

        consumer {
                compatible = "myclockconsumer";
                clocks = <&oscillator 0>, <&oscillator 1>;
        };

Currently, of_clk_get_parent_name(consumer_np, 0) returns "clka"
(and of_clk_get_parent_name(consumer_np, 1) also returns "clka",
this is correct).   Because the "clock-indices" in the clock parent
does not contain <0>, of_clk_get_parent_name(consumer_np, 0) should
return NULL.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
This commit is contained in:
Masahiro Yamada 2015-12-03 11:20:35 +09:00 committed by Stephen Boyd
parent 0b9ddcc84e
commit 8da411cc19
1 changed files with 3 additions and 0 deletions
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3
drivers/clk/clk.c
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@ -3079,6 +3079,9 @@ const char *of_clk_get_parent_name(struct device_node *np, int index)
}
count++;
}
/* We went off the end of 'clock-indices' without finding it */
if (prop && !vp)
return NULL;
if (of_property_read_string_index(clkspec.np, "clock-output-names",
index,