linux-kernel - Re: [PATCH v5 1/7] spi: Enable controllers to extend the SPI protocol with MOSI idle configuration

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Date: Wed, 26 Jun 2024 16:08:58 +0100
From: Mark Brown <broonie@...nel.org>
To: David Lechner <dlechner@...libre.com>
Cc: Marcelo Schmitt <marcelo.schmitt@...log.com>, lars@...afoo.de,
	Michael.Hennerich@...log.com, jic23@...nel.org, robh+dt@...nel.org,
	krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
	nuno.sa@...log.com, corbet@....net, marcelo.schmitt1@...il.com,
	linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
	linux-spi@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 1/7] spi: Enable controllers to extend the SPI
 protocol with MOSI idle configuration

On Wed, Jun 26, 2024 at 09:57:32AM -0500, David Lechner wrote:
> On 6/25/24 4:53 PM, Marcelo Schmitt wrote:

> > +#define SPI_CONTROLLER_MOSI_IDLE_LOW    BIT(8)  /* Can idle MOSI low */
> > +#define SPI_CONTROLLER_MOSI_IDLE_HIGH   BIT(9)  /* Can idle MOSI high */

> These two flags above are still not used anywhere and are redundant with
> the SPI_MOSI_IDLE_LOW/HIGH flags below so I don't think we should be adding
> these.

Yes.

> Also, what is the plan for adding these flags to other SPI controllers. For
> example, the IMX controller in [1] sounds like it should also support 
> SPI_MOSI_IDLE_HIGH. And your comments on an earlier version of this series
> made it sound like Raspberry Pi is always SPI_MOSI_IDLE_LOW, so should
> have that flag.

I don't think we need a specific plan there, obviously it'd be nice for
people to go through and enable but it's also fine to just leave this
for someone who needs the support to implement.

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