[OpenWrt-Devel] [PATCH] lantiq: spi-max-frequency

[John Crispin]

Hi,

common, you know how to send a patch and put a SoB under it. i've seen
you do it lots of times ;)

	John

On 09/11/2015 20:36, Daniel Gimpelevich wrote:
> On Thu, 2015-02-26 at 16:02 +0100, Joerg Jungermann wrote:
>> Hi,
>>
>> I have here multiple TD-W8970 with Annex A and Annex B.
>>
>>>                 m25p80 at 0 {
>>>                         #address-cells = <1>;
>>>                         #size-cells = <1>;
>>>                         compatible = "s25fl129p0";
>>>                         reg = <0 0>;
>>>                         linux,modalias = "m25p80", "mx25l3205d";
>>>                         spi-max-frequency = <1000000>;
>>
>> I increased spi-max-frequency = <50000000>.
>> According to the datasheets I found that is maximum frequency.
>>
>> With my 3 models (2x A, 1x B) these settings work with BB (kernel
>> 3.10) well.
>> I have not yet tested 3.18.
>> I benchmarked boot up times from spi-flash with my build.
>> I could lower bootup times (from uboot to init-completed) from 2m01s
>> to 1m18s.
>>
>> I suggest backporting this increase of the spi freq to BB.
>>
>> best regards
> 
> Index: target/linux/lantiq/dts/DGN3500.dtsi
> ===================================================================
> --- a/target/linux/lantiq/dts/DGN3500.dtsi	(revision 47278)
> +++ b/target/linux/lantiq/dts/DGN3500.dtsi	(working copy)
> @@ -85,7 +85,7 @@
>  			compatible = "s25fl129p0";
>  			reg = <0 0>;
>  			linux,modalias = "m25p80", "mx25l3205d";
> -			spi-max-frequency = <1000000>;
> +			spi-max-frequency = <50000000>;
>  
>  			partition at 0 {
>  				reg = <0x0 0x10000>;
> Index: target/linux/lantiq/dts/TDW89X0.dtsi
> ===================================================================
> --- a/target/linux/lantiq/dts/TDW89X0.dtsi	(revision 47278)
> +++ b/target/linux/lantiq/dts/TDW89X0.dtsi	(working copy)
> @@ -160,7 +160,7 @@
>  			compatible = "en25q64", "m25p80";
>  			reg = <0 0>;
>  			linux,modalias = "en25q64";
> -			spi-max-frequency = <1000000>;
> +			spi-max-frequency = <50000000>;
>  
>  			partition at 0 {
>  				reg = <0x0 0x20000>;
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> 
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