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

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Date: Thu, 27 Jun 2024 14:41:05 -0300
From: Marcelo Schmitt <marcelo.schmitt1@...il.com>
To: Mark Brown <broonie@...nel.org>
Cc: David Lechner <dlechner@...libre.com>,
	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, 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 06/26, Mark Brown wrote:
> 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.

Oops, my bad. Removed them now for v6.

> 
> > 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.