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Message-ID: <217fc47d-1251-46c0-a4d3-637850c4365b@sirena.org.uk>
Date: Tue, 25 Jul 2023 19:48:45 +0100
From: Mark Brown <broonie@...nel.org>
To: Doug Anderson <dianders@...omium.org>
Cc: Vijaya Krishna Nivarthi <quic_vnivarth@...cinc.com>,
Andy Gross <agross@...nel.org>,
Bjorn Andersson <andersson@...nel.org>,
Konrad Dybcio <konrad.dybcio@...aro.org>,
linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-spi@...r.kernel.org
Subject: Re: [PATCH 2/2] spi: spi-qcom-qspi: Add mem_ops to avoid PIO for
badly sized reads
On Tue, Jul 25, 2023 at 11:30:30AM -0700, Doug Anderson wrote:
> Note that it's pretty likely someone wouldn't use this SPI controller
> for anything other than SPI flash. While it's theoretically possible,
> the controller is intended for SPI flash (supports dual and quad SPI
> modes) and is only half duplex.
TBH most devices are half duplex so it's not *that* big a restriction,
and dual/quad mode are obviously attractive if you need to transfer
large quantities of data.
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