On 06/08/2015 at 12:36:54 +0300, Grygorii Strashko wrote :
> Pls, correct me if I'm not right. Is below what you propose?
> 
> Doard dts:
> / {
>  rtc_32k_ext_clk: rtc_osc_xi_clkin32_ext {
>       #clock-cells = <0>;
>       compatible = "fixed-clock";
>       clock-frequency = <32000>;
>       clock-output-names = "rtc_osc_xi_clkin32";
>   };
> }
> 
>  &rtc {
>       status = "okay";
>       clocks = <&sys_32k_ck>, <&rtc_32k_ext_clk>;
>       [optional] clock-names = "int-clk", "ext-clk";
>  };
> 
> Driver:
> 1) clk0 is mandatory, internal clock source
> 2) clk1 is optional, external clock source, so
> if present - RTC driver can switch to use ext clock source
> 

Absolutely!

-- 
Alexandre Belloni, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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