Re: [PATCH V1] spi: Add support for Double Transfer Rate (DTR) mode

[Mukesh Kumar Savaliya <quic_msavaliy@quicinc.com>]

Thanks Mark !

On 3/27/2025 7:37 PM, Mark Brown wrote:
> On Thu, Mar 27, 2025 at 03:33:15PM +0530, Mukesh Kumar Savaliya wrote:
> 
>> IIUC, It comes to the point of first identifying if it's in context of QSPI
>> controller or SPI controller right ?
> 
>> Identify if SPI/QSPI controller has this capability using dtr_caps =
>> true/false. Then check if it's supporting SDR/DDR mode. Can we then
>> introduce below struct to first mark capability as true/false and then
>> process dtr_mode ?
> 
>> if not supported (dtr_caps = false), then don't care dtr_mode.
> 
> We should complain if the device requsted anything the controller can't
> support.
> 
Yes, makes sense. i have added dtr_caps into controller data structure 
and validating it inside the __spi_validate().
>> struct spi_caps {
>> 	bool dtr_mode;
>> 	bool dtr_caps;
>> };
> 
> The controller capabilities are currently mainly advertised via the
> SPI_CONTROLLER_ flags but adding some bools also works, some things
> already do use that.  I'm not sure we need to wrap things in a further
> struct though.
Uploaded Patch V2. Please help review and suggest next. it may require 
still some fine stunning.