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

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Message-ID: <40db39ef-7ef3-4720-9c85-ccfe1c11c299@sirena.org.uk>
Date: Wed, 26 Mar 2025 13:04:26 +0000
From: Mark Brown <broonie@...nel.org>
To: Mukesh Kumar Savaliya <quic_msavaliy@...cinc.com>
Cc: linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org,
	andersson@...nel.org, konradybcio@...nel.org
Subject: Re: [PATCH V1] spi: Add support for Double Transfer Rate (DTR) mode

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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