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

[Mark Brown]

On Wed, Mar 26, 2025 at 02:09:54PM +0530, Mukesh Kumar Savaliya wrote:

> This change introduces a new field `dtr_mode` in the `spi_transfer`
> structure. The `dtr_mode` field allows protocol drivers to indicate if
> Double Transfer Rate (DTR) mode is supported for a given transfer. When
> `dtr_mode` is set to true, the SPI controller will use DTR mode
> otherwise, it will default to single transfer mode.

> The QSPI controller driver uses this flag and configures single or double
> transfer rate using the controller register.

We should have a flag in the controller indicating if it supports this,
and code in the core which returns an error if a driver attempts to use
it when the controller doesn't support it.

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