Messages in this thread Patch in this message | | | Date | Fri, 20 Nov 2015 09:45:09 -0800 | From | Stephen Boyd <> | Subject | Re: [PATCH 2/3] clk: let of_clk_get_parent_name() fail for invalid clock-indices |
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On 11/20, Masahiro Yamada wrote: > Currently, of_clk_get_parent_name() returns a wrong parent clock name > when "clock-indices" property exists and the given 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"; > }; > > Currently, of_clk_get_parent_name(np, 0) returns "clka", but should > return NULL because "clock-indices" does not contain <0>.
What is np pointing at? Something like:
consumer { clocks = <&oscillator 0>; };
Which would be invalid DT because oscillator doesn't have an output for index 0?
> > Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> > @@ -3068,17 +3065,20 @@ const char *of_clk_get_parent_name(struct device_node *np, int index) > 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++; > + list = of_get_property(clkspec.np, "clock-indices", &len); > + if (list) { > + len /= sizeof(*list); > + for (i = 0; i < len; i++) > + if (index == be32_to_cpup(list++)) { > + index = i; > + break; > + } > + if (i == len) > + return NULL; > }
Why can't we leave everything in place and check count == len at the end? i.e.
of_property_for_each_u32(clkspec.np, "clock-indices", prop, vp, pv) { if (index == pv) { index = count; break; } count++; }
if (count == of_property_count_u32_elems(clkspec.np, "clock-indices")) return NULL
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