Add error checking for regmap_attach_dev() call in
imx_rproc_mmio_detect_mode() function to ensure proper error
propagation.

Return the value of regmap_attach_dev() if it fails to prevent
proceeding with an incomplete regmap setup.

Signed-off-by: Chen Ni <nichen@iscas.ac.cn>
---
 drivers/remoteproc/imx_rproc.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/remoteproc/imx_rproc.c b/drivers/remoteproc/imx_rproc.c
index f5f916d67905..0e23f519c247 100644
--- a/drivers/remoteproc/imx_rproc.c
+++ b/drivers/remoteproc/imx_rproc.c
@@ -1007,7 +1007,9 @@ static int imx_rproc_mmio_detect_mode(struct rproc *rproc)
 	}
 
 	priv->regmap = regmap;
-	regmap_attach_dev(dev, regmap, &config);
+	ret = regmap_attach_dev(dev, regmap, &config);
+	if (ret)
+		return dev_err_probe(dev, ret, "regmap attach failed\n");
 
 	if (priv->gpr) {
 		ret = regmap_read(priv->gpr, dcfg->gpr_reg, &val);
-- 
2.25.1