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2018-11-13spi: pxa2xx: Add ready signalLubomir Rintel2-1/+18
Strobe a GPIO line when the slave TX FIFO is filled. This is how the Embedded Controller on an OLPC XO-1.75 machine, that happens to be a SPI master, learns that it can initiate a transaction. Signed-off-by: Lubomir Rintel <lkundrak@v3.sk> Tested-by: Pavel Machek <pavel@ucw.cz> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be> Signed-off-by: Mark Brown <broonie@kernel.org>
2018-11-13spi: pxa2xx: dt-bindings: Add ready GPIO signalLubomir Rintel1-0/+2
This this is used to let the SPI master know that our FIFO is filled and we're ready to service a transfer. Only useful in slave mode. A signal like this is used by an embedded controller on a OLPC XO 1.75 machine, that happens to be a SPI master. Signed-off-by: Lubomir Rintel <lkundrak@v3.sk> Acked-by: Pavel Machek <pavel@ucw.cz> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be> Signed-off-by: Mark Brown <broonie@kernel.org>
2018-11-13spi: pxa2xx: Add slave mode supportLubomir Rintel2-7/+75
Tested on an OLPC XO-1.75 machine, where the Embedded Controller happens to be a SPI master. Signed-off-by: Lubomir Rintel <lkundrak@v3.sk> Acked-by: Pavel Machek <pavel@ucw.cz> Signed-off-by: Mark Brown <broonie@kernel.org>
2018-11-13spi: Deal with slaves that return from transfer_one() unfinishedLubomir Rintel1-23/+39
Some drivers, such as spi-pxa2xx return from the transfer_one callback immediately, idicating that the transfer will be finished asynchronously. Normally, spi_transfer_one_message() synchronously waits for the transfer to finish with wait_for_completion_timeout(). For slaves, we don't want the transaction to time out as it can complete in a long time in future. Use wait_for_completion_interruptible() instead. Signed-off-by: Lubomir Rintel <lkundrak@v3.sk> Acked-by: Pavel Machek <pavel@ucw.cz> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be> Signed-off-by: Mark Brown <broonie@kernel.org>
2018-11-13spi: pxa2xx: dt-bindings: Add spi-slave propertyLubomir Rintel1-0/+1
This is used to indicate that the chip attached to this controller is a SPI master. Signed-off-by: Lubomir Rintel <lkundrak@v3.sk> Reviewed-by: Rob Herring <robh@kernel.org> Acked-by: Pavel Machek <pavel@ucw.cz> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be> Signed-off-by: Mark Brown <broonie@kernel.org>
2018-11-07spi: rspi: Add r8a77470 to the compatible listFabrizio Castro1-0/+1
Add r8a77470 to the list of examples with soctypes. No driver change is needed as "renesas,qspi" will activate the right code within the corresponding driver. Signed-off-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2018-11-07spi: Kconfig: Enable McSPI driver for K3 platformsVignesh R1-1/+1
Enable McSPI driver to be built for K3 platforms, to support McSPI on AM654 SoC of K3 family. Signed-off-by: Vignesh R <vigneshr@ti.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2018-11-07spi: omap-spi: Add compatible for AM654 SoCVignesh R1-0/+1
AM654 SoC has same McSPI IP as OMAP2+ platforms. Add new compatible to support McSPI on AM654 SoC. Signed-off-by: Vignesh R <vigneshr@ti.com> Signed-off-by: Mark Brown <broonie@kernel.org>