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* [PATCH] spi: imx: add 16/32 bits per word support for slave mode
@ 2021-04-08 10:33 Clark Wang
  2021-04-08 10:33 ` [PATCH] spi: imx: add a check for speed_hz before calculating the clock Clark Wang
  2021-05-24  8:25 ` [PATCH] spi: imx: add 16/32 bits per word support for slave mode Tomas Melin
  0 siblings, 2 replies; 6+ messages in thread
From: Clark Wang @ 2021-04-08 10:33 UTC (permalink / raw)
  To: broonie, shawnguo, s.hauer, festevam
  Cc: kernel, linux-imx, linux-spi, linux-arm-kernel, linux-kernel

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;
 	}
 
-- 
2.25.1


^ permalink raw reply	[flat|nested] 6+ messages in thread

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Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
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2021-04-08 10:33 [PATCH] spi: imx: add 16/32 bits per word support for slave mode Clark Wang
2021-04-08 10:33 ` [PATCH] spi: imx: add a check for speed_hz before calculating the clock Clark Wang
2021-04-08 13:43   ` Mark Brown
2021-04-08 14:05   ` Mark Brown
2021-04-09 16:22   ` Mark Brown
2021-05-24  8:25 ` [PATCH] spi: imx: add 16/32 bits per word support for slave mode Tomas Melin

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