linux-kernel - Re: [PATCH v6 2/7] spi: bitbang: Implement support for MOSI idle state configuration

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Date: Sun, 30 Jun 2024 11:52:04 +0100
From: Jonathan Cameron <jic23@...nel.org>
To: Marcelo Schmitt <marcelo.schmitt@...log.com>
Cc: <broonie@...nel.org>, <lars@...afoo.de>, <Michael.Hennerich@...log.com>,
 <robh+dt@...nel.org>, <krzysztof.kozlowski+dt@...aro.org>,
 <conor+dt@...nel.org>, <nuno.sa@...log.com>, <dlechner@...libre.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 v6 2/7] spi: bitbang: Implement support for MOSI idle
 state configuration

On Sat, 29 Jun 2024 16:05:05 -0300
Marcelo Schmitt <marcelo.schmitt@...log.com> wrote:

> Some SPI peripherals may require strict MOSI line state when the controller
> is not clocking out data.
> Implement support for MOSI idle state configuration (low or high) by
> setting the data output line level on controller setup and after transfers.
> Bitbang operations now call controller specific set_mosi_idle() call back
> to set MOSI to its idle state.
> The MOSI line is kept at its idle state if no tx buffer is provided.

Slightly odd wrapping - this doesn't warrant 3 paragraphs, so I'd just
reflow it into one. 

I'm not a fan of counting F's, so would have gone with GENMASK for those
but it's not the local style, so fair enough to hard code them.
FWIW given it's been a long time since I messed around in SPI controller
drivers...

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>


> 
> Acked-by: Nuno Sa <nuno.sa@...log.com>
> Reviewed-by: David Lechner <dlechner@...libre.com>
> Signed-off-by: Marcelo Schmitt <marcelo.schmitt@...log.com>