diff mbox series

[v4,3/9] spi: sh-msiof: ignore driver probing if it was MSIOF Sound

Message ID 87wmbi2x0g.wl-kuninori.morimoto.gx@renesas.com
State New
Headers show
Series ASoC: add Renesas MSIOF sound driver | expand

Commit Message

Kuninori Morimoto April 17, 2025, 11:23 p.m. UTC 
Renesas MSIOF (Clock-Synchronized Serial Interface with FIFO) can work as
both SPI and I2S. MSIOF-I2S will use Audio Graph Card/Card2 driver which
Of-Graph in DT.

MSIOF-SPI/I2S are using same DT compatible properties.
MSIOF-I2S         uses Of-Graph for Audio-Graph-Card/Card2,
MSIOF-SPI doesn't use  Of-Graph.

Check "port" node when driver probing

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
 drivers/spi/spi-sh-msiof.c | 6 ++++++
 1 file changed, 6 insertions(+)
diff mbox series

Patch

diff --git a/drivers/spi/spi-sh-msiof.c b/drivers/spi/spi-sh-msiof.c
index 581cec19cb770..d9e3d83fc7e84 100644
--- a/drivers/spi/spi-sh-msiof.c
+++ b/drivers/spi/spi-sh-msiof.c
@@ -20,6 +20,7 @@ 
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/of.h>
+#include <linux/of_graph.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
 #include <linux/sh_dma.h>
@@ -1281,6 +1282,11 @@  static int sh_msiof_spi_probe(struct platform_device *pdev)
 	int i;
 	int ret;
 
+	/* Check whether MSIOF is used as I2S mode or SPI mode by checking "port" node */
+	struct device_node *port __free(device_node) = of_graph_get_next_port(dev->of_node, NULL);
+	if (port) /* It was MSIOF-I2S */
+		return -ENODEV;
+
 	chipdata = of_device_get_match_data(dev);
 	if (chipdata) {
 		info = sh_msiof_spi_parse_dt(dev);