remoteproc: imx_rproc: Check return value of regmap_attach_dev() in imx_rproc_mmio_detect_mode()

[ Upstream commit a48c667 ]

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.

Suggested-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Chen Ni <nichen@iscas.ac.cn>
Fixes: e14168b ("remoteproc: imx_rproc: Simplify IMX_RPROC_MMIO switch case")
Link: https://lore.kernel.org/r/20260209051407.1467660-1-nichen@iscas.ac.cn
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

Author: Chen Ni

drivers/remoteproc/imx_rproc.c

@@ -899,7 +899,11 @@ 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) {
+		dev_err(dev, "regmap attach failed\n");
+		return ret;
+	}
 
 	if (priv->gpr) {
 		ret = regmap_read(priv->gpr, dcfg->gpr_reg, &val);