[PATCH v2 3/9] spi: sh-msiof: ignore driver probing if it was MSIOF Sound

Kuninori Morimoto
2025-04-11T01:03:44Z

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 --git a/drivers/spi/spi-sh-msiof.c b/drivers/spi/spi-sh-msiof.c
index 581cec19cb77..d9e3d83fc7e8 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);
--
2.43.0