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Recently a maximum transfer size was was introduced in struct spi_master. However there are also spi controllers with a maximum message size, e.g. fsl-espi has a max message size of 64KB. Introduce a hook max_message_size to deal with such limitations. Also make sure that spi_max_transfer_size doesn't return greater values than spi_max_message_size, even if hook max_transfer_size is not set. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: Mark Brown <broonie@kernel.org>