linux-kernel - Re: [PATCH v4 3/8] spi: stm32: Add 'SPI_SIMPLEX_RX', 'SPI_3WIRE

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Date:   Fri, 22 May 2020 12:36:34 +0100
From:   Mark Brown <broonie@...nel.org>
To:     dillon.minfei@...il.com
Cc:     robh+dt@...nel.org, p.zabel@...gutronix.de,
        mcoquelin.stm32@...il.com, devicetree@...r.kernel.org,
        alexandre.torgue@...com, thierry.reding@...il.com,
        sam@...nborg.org, airlied@...ux.ie, daniel@...ll.ch,
        mturquette@...libre.com, sboyd@...nel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-spi@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        dri-devel@...ts.freedesktop.org, linux-clk@...r.kernel.org
Subject: Re: [PATCH v4 3/8] spi: stm32: Add 'SPI_SIMPLEX_RX', 'SPI_3WIRE_RX'
 support for stm32f4

On Mon, May 18, 2020 at 07:09:20PM +0800, dillon.minfei@...il.com wrote:

> 2, use stm32 spi's "In full-duplex (BIDIMODE=0 and RXONLY=0)", as tx_buf is
> null, we must add dummy data sent out before read data.
> so, add stm32f4_spi_tx_dummy() to handle this situation.

There are flags SPI_CONTROLLER_MUST_TX and SPI_CONTROLLER_MUST_RX flags
that the driver can set if it needs to, no need to open code this in the
driver.

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