spi: add DT bindings for UniPhier SPI controller
Add DT bindings for SPI controller implemented in UniPhier SoCs. Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com> Signed-off-by: Keiji Hayashibara <hayashibara.keiji@socionext.com> Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Mark Brown <broonie@kernel.org>
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