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From: Robin Murphy <robin.murphy-5wv7dgnIgG8@public.gmane.org>
To: linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
	devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Cc: sudeep.holla-5wv7dgnIgG8@public.gmane.org,
	lorenzo.pieralisi-5wv7dgnIgG8@public.gmane.org,
	liviu.dudau-5wv7dgnIgG8@public.gmane.org
Subject: [PATCH 2/3] arm64: dts: juno: Add ETR SMMU power domain
Date: Wed, 18 Jan 2017 12:12:51 +0000	[thread overview]
Message-ID: <55add42885c182648ff466254176e43e66137597.1484741104.git.robin.murphy@arm.com> (raw)
In-Reply-To: <74595d6d866518db7cfabc39b4cf9b54d3be9bde.1484741104.git.robin.murphy-5wv7dgnIgG8@public.gmane.org>

It is not at all clear from the documentation, but straightforward to
determine in practice, that the ETR SMMU is actually in the DEBUGSYS
power domain. Add that to the DT so that anyone brave enough to enable
said SMMU doesn't experience a system lockup on boot, especially a
sneaky one which goes away as soon as you connect an external debugger
to have a look at where it's stuck (thus powering up DEBUGSYS by other
means and allowing it to make progress again before actually halting...)

Signed-off-by: Robin Murphy <robin.murphy-5wv7dgnIgG8@public.gmane.org>
---
 arch/arm64/boot/dts/arm/juno-base.dtsi | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/boot/dts/arm/juno-base.dtsi b/arch/arm64/boot/dts/arm/juno-base.dtsi
index 5e7640d6ec69..37225dfdc995 100644
--- a/arch/arm64/boot/dts/arm/juno-base.dtsi
+++ b/arch/arm64/boot/dts/arm/juno-base.dtsi
@@ -52,6 +52,7 @@
 		#iommu-cells = <1>;
 		#global-interrupts = <1>;
 		dma-coherent;
+		power-domains = <&scpi_devpd 0>;
 		status = "disabled";
 	};
 
-- 
2.11.0.dirty

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WARNING: multiple messages have this Message-ID (diff)
From: robin.murphy@arm.com (Robin Murphy)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 2/3] arm64: dts: juno: Add ETR SMMU power domain
Date: Wed, 18 Jan 2017 12:12:51 +0000	[thread overview]
Message-ID: <55add42885c182648ff466254176e43e66137597.1484741104.git.robin.murphy@arm.com> (raw)
In-Reply-To: <74595d6d866518db7cfabc39b4cf9b54d3be9bde.1484741104.git.robin.murphy@arm.com>

It is not at all clear from the documentation, but straightforward to
determine in practice, that the ETR SMMU is actually in the DEBUGSYS
power domain. Add that to the DT so that anyone brave enough to enable
said SMMU doesn't experience a system lockup on boot, especially a
sneaky one which goes away as soon as you connect an external debugger
to have a look at where it's stuck (thus powering up DEBUGSYS by other
means and allowing it to make progress again before actually halting...)

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
---
 arch/arm64/boot/dts/arm/juno-base.dtsi | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/boot/dts/arm/juno-base.dtsi b/arch/arm64/boot/dts/arm/juno-base.dtsi
index 5e7640d6ec69..37225dfdc995 100644
--- a/arch/arm64/boot/dts/arm/juno-base.dtsi
+++ b/arch/arm64/boot/dts/arm/juno-base.dtsi
@@ -52,6 +52,7 @@
 		#iommu-cells = <1>;
 		#global-interrupts = <1>;
 		dma-coherent;
+		power-domains = <&scpi_devpd 0>;
 		status = "disabled";
 	};
 
-- 
2.11.0.dirty

  parent reply	other threads:[~2017-01-18 12:12 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-01-18 12:12 [PATCH 1/3] arm64: dts: juno: Add dma-ranges property Robin Murphy
2017-01-18 12:12 ` Robin Murphy
     [not found] ` <74595d6d866518db7cfabc39b4cf9b54d3be9bde.1484741104.git.robin.murphy-5wv7dgnIgG8@public.gmane.org>
2017-01-18 12:12   ` Robin Murphy [this message]
2017-01-18 12:12     ` [PATCH 2/3] arm64: dts: juno: Add ETR SMMU power domain Robin Murphy
2017-01-18 12:12   ` [PATCH 3/3] arm64: dts: juno: Remove Motherboard USB node Robin Murphy
2017-01-18 12:12     ` Robin Murphy
2017-01-18 12:38     ` Local user for Liviu Dudau
2017-01-18 12:38       ` Local user for Liviu Dudau
2017-01-18 14:18       ` Sudeep Holla
2017-01-18 14:18         ` Sudeep Holla

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