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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/drivers/mux/mmio.c
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@@ -28,6 +28,7 @@
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 static const struct of_device_id mux_mmio_dt_ids[] = {
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 	{ .compatible = "mmio-mux", },
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+	{ .compatible = "reg-mux", },
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 	{ /* sentinel */ }
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 };
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 MODULE_DEVICE_TABLE(of, mux_mmio_dt_ids);
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@@ -43,7 +44,10 @@
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 	int ret;
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 	int i;
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-	regmap = syscon_node_to_regmap(np->parent);
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+	if (of_device_is_compatible(np, "mmio-mux"))
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+		regmap = syscon_node_to_regmap(np->parent);
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+	else
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+		regmap = dev_get_regmap(dev->parent, NULL) ?: ERR_PTR(-ENODEV);
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 	if (IS_ERR(regmap)) {
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 		ret = PTR_ERR(regmap);
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 		dev_err(dev, "failed to get regmap: %d\n", ret);