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MIPS changes for 4.16-rc2

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A single change (and associated DT binding update) to allow the address
 of the MIPS Cluster Power Controller (CPC) to be chosen by DT, which
 allows SMP to work on generic MIPS kernels where the bootloader hasn't
 configured the CPC address (i.e. the new Ranchu platform).
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Merge tag 'mips_4.16_2' of git://git.kernel.org/pub/scm/linux/kernel/git/jhogan/mips

Pull MIPS fix from James Hogan:
 "A single change (and associated DT binding update) to allow the
  address of the MIPS Cluster Power Controller (CPC) to be chosen by DT,
  which allows SMP to work on generic MIPS kernels where the bootloader
  hasn't configured the CPC address (i.e. the new Ranchu platform)"

* tag 'mips_4.16_2' of git://git.kernel.org/pub/scm/linux/kernel/git/jhogan/mips:
  MIPS: CPC: Map registers using DT in mips_cpc_default_phys_base()
  dt-bindings: Document mti,mips-cpc binding
This commit is contained in:
Linus Torvalds 2018-02-13 09:35:17 -08:00
commit 61f14c015f
3 changed files with 22 additions and 0 deletions
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8
Documentation/devicetree/bindings/power/mti,mips-cpc.txt Normal file
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@ -0,0 +1,8 @@
Binding for MIPS Cluster Power Controller (CPC).
This binding allows a system to specify where the CPC registers are
located.
Required properties:
compatible : Should be "mti,mips-cpc".
regs: Should describe the address & size of the CPC register region.

1
MAINTAINERS
View File

@ -9206,6 +9206,7 @@ MIPS GENERIC PLATFORM
M: Paul Burton <paul.burton@mips.com>
L: linux-mips@linux-mips.org
S: Supported
F: Documentation/devicetree/bindings/power/mti,mips-cpc.txt
F: arch/mips/generic/
F: arch/mips/tools/generic-board-config.sh

13
arch/mips/kernel/mips-cpc.c
View File

@ -10,6 +10,8 @@
#include <linux/errno.h>
#include <linux/percpu.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/spinlock.h>
#include <asm/mips-cps.h>
@ -22,6 +24,17 @@ static DEFINE_PER_CPU_ALIGNED(unsigned long, cpc_core_lock_flags);
phys_addr_t __weak mips_cpc_default_phys_base(void)
{
struct device_node *cpc_node;
struct resource res;
int err;
cpc_node = of_find_compatible_node(of_root, NULL, "mti,mips-cpc");
if (cpc_node) {
err = of_address_to_resource(cpc_node, 0, &res);
if (!err)
return res.start;
}
return 0;
}