spi: fsl-espi: expose maximum transfer size limit

The fsl-espi hardware can trasfer at most 64K data so report teh
limitation.

Based on patch by Heiner Kallweit <hkallweit1@gmail.com>

CC: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Michal Suchanek <hramrach@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index c27124a5ec8e..7fd6a4c009d2 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -643,6 +643,11 @@ static int fsl_espi_runtime_resume(struct device *dev)
 }
 #endif
 
+static size_t fsl_espi_max_transfer_size(struct spi_device *spi)
+{
+        return SPCOM_TRANLEN_MAX;
+}
+
 static struct spi_master * fsl_espi_probe(struct device *dev,
                 struct resource *mem, unsigned int irq)
 {
@@ -670,6 +675,7 @@ static struct spi_master * fsl_espi_probe(struct device *dev,
         master->cleanup = fsl_espi_cleanup;
         master->transfer_one_message = fsl_espi_do_one_msg;
         master->auto_runtime_pm = true;
+        master->max_transfer_size = fsl_espi_max_transfer_size;
 
         mpc8xxx_spi = spi_master_get_devdata(master);