Enable 16/32 bits per word support for spi-imx slave mode.
It only support 8 bits per word in slave mode before.

Signed-off-by: Clark Wang <xiaoning.wang@nxp.com>
Reviewed-by: Haibo Chen <haibo.chen@nxp.com>
---
  drivers/spi/spi-imx.c | 13 +++++++++++--
  1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c
index 4fe767acaca7..24ba7ab1b05d 100644
--- a/drivers/spi/spi-imx.c
+++ b/drivers/spi/spi-imx.c

@@ -386,7 +386,12 @@ static void spi_imx_buf_tx_swap(struct spi_imx_data *spi_imx)
  
  static void mx53_ecspi_rx_slave(struct spi_imx_data *spi_imx)
  {
-	u32 val = be32_to_cpu(readl(spi_imx->base + MXC_CSPIRXDATA));
+	u32 val = readl(spi_imx->base + MXC_CSPIRXDATA);
+
+	if (spi_imx->bits_per_word <= 8)
+		val = be32_to_cpu(val);
+	else if (spi_imx->bits_per_word <= 16)
+		val = (val << 16) | (val >> 16);

  
  	if (spi_imx->rx_buf) {
  		int n_bytes = spi_imx->slave_burst % sizeof(val);

@@ -415,7 +420,11 @@ static void mx53_ecspi_tx_slave(struct spi_imx_data *spi_imx)
  	if (spi_imx->tx_buf) {
  		memcpy(((u8 *)&val) + sizeof(val) - n_bytes,
  		       spi_imx->tx_buf, n_bytes);
-		val = cpu_to_be32(val);
+		if (spi_imx->bits_per_word <= 8)
+			val = cpu_to_be32(val);
+		else if (spi_imx->bits_per_word <= 16)
+			val = (val << 16) | (val >> 16);
+
  		spi_imx->tx_buf += n_bytes;
  	}