add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/bus/mips_cdmm.c
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@@ -13,6 +13,8 @@
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 #include <linux/cpu.h>
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 #include <linux/cpumask.h>
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 #include <linux/io.h>
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+#include <linux/of_address.h>
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+#include <linux/of.h>
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 #include <linux/platform_device.h>
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 #include <linux/slab.h>
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 #include <linux/smp.h>
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@@ -337,9 +339,23 @@
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  * Picking a suitable physical address at which to map the CDMM region is
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  * platform specific, so this weak function can be overridden by platform
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  * code to pick a suitable value if none is configured by the bootloader.
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+ * By default this method tries to find a CDMM-specific node in the system
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+ * dtb. Note that this won't work for early serial console.
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  */
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 phys_addr_t __weak mips_cdmm_phys_base(void)
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 {
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+	struct device_node *np;
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+	struct resource res;
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+	int err;
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+
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+	np = of_find_compatible_node(NULL, NULL, "mti,mips-cdmm");
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+	if (np) {
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+		err = of_address_to_resource(np, 0, &res);
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+		of_node_put(np);
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+		if (!err)
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+			return res.start;
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+	}
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+
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 	return 0;
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 }
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