spi: orion: On a38x, implement "50MHZ SPI AC timing" Erratum No. FE-9144572
Description: On Armada 38x, the device SPI interface supports frequencies of up to 50 MHz. However, due to this erratum, when the device core clock is 250 MHz and the SPI interfaces is configured for 50MHz SPI clock and CPOL=CPHA=1, there might occur data corruption on reads from the SPI device. Workaround: Work in one of the following configurations: 1. Set CPOL=CPHA=0 in "SPI Interface Configuration Register". 2. Set TMISO_SAMPLE value to 0x2 in "SPI Timing Parameters 1 Register" before setting the interface. [gregory.clement@free-electrons.com}: port to v4.2-rc, use is_errata_50mhz_ac instead of using a new ARMADA_380_SPI spi type. Signed-off-by:Nadav Haklai <nadavh@marvell.com> Signed-off-by:
Gregory CLEMENT <gregory.clement@free-electrons.com> Signed-off-by:
Mark Brown <broonie@kernel.org> Cc: stable@vger.kernel.org
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