Rob,
On 19/09/16 08:21, Mirza Krak wrote:
> 2016-09-06 12:32 GMT+02:00 Jon Hunter <jonathanh@xxxxxxxxxx>:
>>
>> 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?
>>
>
> Hi.
>
> I have been on vacation and now I am back and wanted to finalize these
> patch series.
>
> So pinging this thread to see I we can agree on a solution.
>
> Rob any comments to my proposal and Jon`s comment?
Can you comment on the above?
Cheers
Jon
--
nvpublic
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