linux-kernel - [PATCH] spi: imx: add 16/32 bits per word support for target mode

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Message-Id: <20251024054952.408393-1-carlos.song@nxp.com>
Date: Fri, 24 Oct 2025 13:49:52 +0800
From: carlos.song@....com
To: frank.li@....com,
	broonie@...nel.org,
	shawnguo@...nel.org,
	s.hauer@...gutronix.de,
	kernel@...gutronix.de,
	festevam@...il.com
Cc: linux-spi@...r.kernel.org,
	imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] spi: imx: add 16/32 bits per word support for target mode

From: Clark Wang <xiaoning.wang@....com>

Now for ECSPI only support 8 bits per word in target mode.
Enable 16/32 bits per word support for spi-imx target mode.

Signed-off-by: Carlos Song <carlos.song@....com>
Signed-off-by: Clark Wang <xiaoning.wang@....com>
---
 drivers/spi/spi-imx.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c
index 155ddeb8fcd4..4ffee6c5d5c4 100644
--- a/drivers/spi/spi-imx.c
+++ b/drivers/spi/spi-imx.c
@@ -424,8 +424,12 @@ static void spi_imx_buf_tx_swap(struct spi_imx_data *spi_imx)
 
 static void mx53_ecspi_rx_target(struct spi_imx_data *spi_imx)
 {
-	u32 val = ioread32be(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->target_burst % sizeof(val);
 
@@ -453,12 +457,16 @@ static void mx53_ecspi_tx_target(struct spi_imx_data *spi_imx)
 	if (spi_imx->tx_buf) {
 		memcpy(((u8 *)&val) + sizeof(val) - n_bytes,
 		       spi_imx->tx_buf, n_bytes);
+		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;
 	}
 
 	spi_imx->count -= n_bytes;
 
-	iowrite32be(val, spi_imx->base + MXC_CSPITXDATA);
+	writel(val, spi_imx->base + MXC_CSPITXDATA);
 }
 
 /* MX51 eCSPI */
-- 
2.34.1