[PATCH 0/2] ARM: keystone: Enable CPU hotplug

[PATCH 0/2] ARM: keystone: Enable CPU hotplug

[Keerthy]

Series enables CPU hotplug for K2HK. CPU Hotplug tested on
K2HK-EVM.

It is on top of 4.6-rc2.

Keerthy (2):
  keystone: dts: add psci command definition
  ARM: configs: keystone: Add CPU Hotplug related options

 arch/arm/boot/dts/keystone.dtsi     | 8 ++++++++
 arch/arm/configs/keystone_defconfig | 2 ++
 2 files changed, 10 insertions(+)

-- 
1.9.1

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[PATCH 1/2] keystone: dts: add psci command definition

[Keerthy]

From: Vitaly Andrianov <vitalya-l0cyMroinI0@public.gmane.org> 

This commit adds definition for cpu_on, cpu_off and cpu_suspend commands.
These definitions must match the corresponding PSCI definitions in
boot monitor.

Having those command and corresponding PSCI support in boot monitor allows
run time CPU hot plugin.

Signed-off-by: Vitaly Andrianov <vitalya-l0cyMroinI0@public.gmane.org>
Signed-off-by: Keerthy <j-keerthy-l0cyMroinI0@public.gmane.org>
---
 arch/arm/boot/dts/keystone.dtsi | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/arm/boot/dts/keystone.dtsi b/arch/arm/boot/dts/keystone.dtsi
index 3f27282..0076489 100644
--- a/arch/arm/boot/dts/keystone.dtsi
+++ b/arch/arm/boot/dts/keystone.dtsi
@@ -59,6 +59,14 @@
 			     <GIC_SPI 23 IRQ_TYPE_EDGE_RISING>;
 	};
 
+	psci {
+		compatible	= "arm,psci";
+		method		= "smc";
+		cpu_suspend	= <0x84000001>;
+		cpu_off		= <0x84000002>;
+		cpu_on		= <0x84000003>;
+	};
+
 	soc {
 		#address-cells = <1>;
 		#size-cells = <1>;
-- 
1.9.1

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[PATCH 2/2] ARM: configs: keystone: Add CPU Hotplug related options

[Keerthy]

Add the config options needed to get CPU hotplug functional.

Signed-off-by: Keerthy <j-keerthy-l0cyMroinI0@public.gmane.org>
---
 arch/arm/configs/keystone_defconfig | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm/configs/keystone_defconfig b/arch/arm/configs/keystone_defconfig
index 5bcc9cf..faba04d 100644
--- a/arch/arm/configs/keystone_defconfig
+++ b/arch/arm/configs/keystone_defconfig
@@ -30,6 +30,8 @@ CONFIG_PCI=y
 CONFIG_PCI_MSI=y
 CONFIG_PCI_KEYSTONE=y
 CONFIG_SMP=y
+CONFIG_HOTPLUG_CPU=y
+CONFIG_ARM_PSCI=y
 CONFIG_PREEMPT=y
 CONFIG_AEABI=y
 CONFIG_HIGHMEM=y
-- 
1.9.1

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Re: [PATCH 0/2] ARM: keystone: Enable CPU hotplug

[santosh shilimkar]

On 4/4/2016 11:29 AM, Keerthy wrote:
> Series enables CPU hotplug for K2HK. CPU Hotplug tested on
> K2HK-EVM.
>
> It is on top of 4.6-rc2.
>
> Keerthy (2):
>    keystone: dts: add psci command definition
>    ARM: configs: keystone: Add CPU Hotplug related options
>
Looks fine to me. Will add it to the 4.7 queue. Thanks !!

Reagrds,
Santosh

Re: [PATCH 0/2] ARM: keystone: Enable CPU hotplug

[Russell King - ARM Linux]

On Mon, Apr 04, 2016 at 07:13:51PM -0700, santosh shilimkar wrote:
> On 4/4/2016 11:29 AM, Keerthy wrote:
> >Series enables CPU hotplug for K2HK. CPU Hotplug tested on
> >K2HK-EVM.
> >
> >It is on top of 4.6-rc2.
> >
> >Keerthy (2):
> >   keystone: dts: add psci command definition
> >   ARM: configs: keystone: Add CPU Hotplug related options
> >
> Looks fine to me. Will add it to the 4.7 queue. Thanks !!

Just to note that this is required to get CPU hotplug working with
the TI keystone2 skern implementation, which is different to the
uboot psci code.

Now that I've been able to upgrade my board to a recent uboot and
skern, I can add this:

Tested-by: Russell King <rmk+kernel-lFZ/pmaqli7XmaaqVzeoHQ@public.gmane.org>

Now... if we could get the damn CPU fan under control, I might be
able to stand leaving the board powered on for longer, instead of
reaching for the power plug at the earliest possibility!

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