mips: cdmm: Add mti,mips-cdmm dtb node support (2121aa3e) · Commits · 戴 / test

Since having and mapping the CDMM block is platform specific, then instead of just returning a zero-address, lets make the default CDMM base address search method (mips_cdmm_phys_base()) to do something useful. For instance to find the address in a dedicated dtb-node in order to support of-based platforms by default. Signed-off-by:

Serge Semin <Sergey.Semin@baikalelectronics.ru> Signed-off-by:

Thomas Bogendoerfer <tsbogend@alpha.franken.de>

drivers/bus/mips_cdmm.c

+15 −0

Original line number	Diff line number	Diff line
		@@ -13,6 +13,8 @@
		#include <linux/cpu.h>
		#include <linux/cpumask.h>
		#include <linux/io.h>
		#include <linux/of_address.h>
		#include <linux/of.h>
		#include <linux/platform_device.h>
		#include <linux/slab.h>
		#include <linux/smp.h>
		@@ -337,9 +339,22 @@ static phys_addr_t mips_cdmm_cur_base(void)
		* Picking a suitable physical address at which to map the CDMM region is
		* platform specific, so this weak function can be overridden by platform
		* code to pick a suitable value if none is configured by the bootloader.
		* By default this method tries to find a CDMM-specific node in the system
		* dtb. Note that this won't work for early serial console.
		*/
		phys_addr_t __weak mips_cdmm_phys_base(void)
		{
		struct device_node *np;
		struct resource res;
		int err;

		np = of_find_compatible_node(NULL, NULL, "mti,mips-cdmm");
		if (np) {
		err = of_address_to_resource(np, 0, &res);
		if (!err)
		return res.start;
		}

		return 0;
		}

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