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mips: cdmm: Add mti,mips-cdmm dtb node support 

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>
This commit is contained in:
Serge Semin 2020-07-14 15:57:50 +03:00 committed by Thomas Bogendoerfer
parent c9a56aa972
commit 2121aa3e23
1 changed files with 15 additions and 0 deletions
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15
drivers/bus/mips_cdmm.c
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@ -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;
}