On 31/08/16 12:22, Mirza Krak wrote:
> 2016-08-30 19:06 GMT+02:00 Rob Herring <robh@xxxxxxxxxx>:
...
>>> nvidia,snor-cs = <4>;
>>
>> NAK, no custom CS properties.
Ok, so ...
> gmi@70090000 {
> compatible = "nvidia,tegra20-gmi";
> reg = <0x70009000 0x1000>;
> #address-cells = <2>;
> #size-cells = <1>;
> clocks = <&tegra_car TEGRA20_CLK_NOR>;
> clock-names = "gmi";
> resets = <&tegra_car 42>;
> reset-names = "gmi";
> ranges = <4 0 0xd0000000 0xfffffff>;
>
> status = "okay";
>
> bus@4,0 {
> compatible = "simple-bus";
> #address-cells = <1>;
> #size-cells = <1>;
> ranges = <0 4 0 0x40000>;
>
> nvidia,snor-mux-mode;
> nvidia,snor-adv-inv;
>
> can@0 {
> reg = <0 0x100>;
> ...
> };
>
> can@40000 {
> reg = <0x40000 0x100>;
> ...
> };
> };
> };
>
> Have I understood you correct?
>
> Also wanted to verify the example case where you only have on device
> connected to one CS#, from what I see in other implementations it
> seems OK to put the CS# in the reg property in that case. Is this
> correct?
>
> Example with one SJA1000 CAN controller connected to the GMI bus
> on CS4:
>
> gmi@70090000 {
> compatible = "nvidia,tegra20-gmi";
> reg = <0x70009000 0x1000>;
> #address-cells = <2>;
> #size-cells = <1>;
> clocks = <&tegra_car TEGRA20_CLK_NOR>;
> clock-names = "gmi";
> resets = <&tegra_car 42>;
> reset-names = "gmi";
> ranges = <4 0 0xd0000000 0xfffffff>;
>
> status = "okay";
>
> can@4,0 {
> reg = <4 0 0x100>;
> nvidia,snor-mux-mode;
> nvidia,snor-adv-inv;
> ...
> };
> };
>
> Jon, to be able to handle both cases in the driver we would first
> attempt to decode the CS# from the ranges property, and fallback to
> reg property if no ranges are defined. Does that sound reasonable?
Given the above examples that may be supported, is there a
better/simpler way to extract the CS# than what Mirza is proposing? For
example, from the node-name unit-address?
Cheers
Jon
--
nvpublic
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