From: Kumar Gala <galak@codeaurora.org> To: Mark Rutland <mark.rutland@arm.com> Cc: "linux-arm-msm@vger.kernel.org" <linux-arm-msm@vger.kernel.org>, "linux-arm-kernel@lists.infradead.org" <linux-arm-kernel@lists.infradead.org>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, "arm@kernel.org" <arm@kernel.org>, "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>, "heiko@sntech.de" <heiko@sntech.de> Subject: Re: [PATCH v3 2/4] arm64: dts: Add Qualcomm MSM8916 SoC and evaluation board dts Date: Thu, 12 Mar 2015 14:54:15 -0500 [thread overview] Message-ID: <F0B0524B-AC0E-4E60-9A21-1208C4A978F5@codeaurora.org> (raw) In-Reply-To: <20150312182508.GF30145@leverpostej> On Mar 12, 2015, at 1:25 PM, Mark Rutland <mark.rutland@arm.com> wrote: >>>> + cpus { >>>> + #address-cells = <1>; >>>> + #size-cells = <0>; >>>> + >>>> + CPU0: cpu@0 { >>>> + device_type = "cpu"; >>>> + compatible = "arm,cortex-a53", "arm,armv8"; >>>> + reg = <0x0>; >>>> + }; >>>> + >>>> + CPU1: cpu@1 { >>>> + device_type = "cpu"; >>>> + compatible = "arm,cortex-a53", "arm,armv8"; >>>> + reg = <0x1>; >>>> + }; >>>> + >>>> + CPU2: cpu@2 { >>>> + device_type = "cpu"; >>>> + compatible = "arm,cortex-a53", "arm,armv8"; >>>> + reg = <0x2>; >>>> + }; >>>> + >>>> + CPU3: cpu@3 { >>>> + device_type = "cpu"; >>>> + compatible = "arm,cortex-a53", "arm,armv8"; >>>> + reg = <0x3>; >>>> + }; >>>> + }; >>> >>> The secondary CPUs need an enable-method. Are you using PSCI or >>> spin-table? >> >> This is on purpose. We aren’t using either PSCI or spin-table. Right >> now the dts is for booting on a single core. I can drop CPU1..CPU3 if >> that helps. > > We won't poke the CPUs without an enable-method, so personally I'm not > too worried either way about having the CPUs listed. That was my thinking, so left them in. > Which of spin-table/psci are you planning on using for SMP support, and > when would that be likely to appear? We have a qcom specific SMP enablement method for this device. This was one of our first devices so it utilized as much from arm 32-bit as possible. > Which exception level do CPUs enter the kernel? Even without a > virt-capable GIC booting at EL2 is less work for the FW and gives the > kernel a better chance of fixing things up (e.g. CNTVOFF). I think the enter in EL1. - k -- Qualcomm Innovation Center, Inc. The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project
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From: galak@codeaurora.org (Kumar Gala) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v3 2/4] arm64: dts: Add Qualcomm MSM8916 SoC and evaluation board dts Date: Thu, 12 Mar 2015 14:54:15 -0500 [thread overview] Message-ID: <F0B0524B-AC0E-4E60-9A21-1208C4A978F5@codeaurora.org> (raw) In-Reply-To: <20150312182508.GF30145@leverpostej> On Mar 12, 2015, at 1:25 PM, Mark Rutland <mark.rutland@arm.com> wrote: >>>> + cpus { >>>> + #address-cells = <1>; >>>> + #size-cells = <0>; >>>> + >>>> + CPU0: cpu at 0 { >>>> + device_type = "cpu"; >>>> + compatible = "arm,cortex-a53", "arm,armv8"; >>>> + reg = <0x0>; >>>> + }; >>>> + >>>> + CPU1: cpu at 1 { >>>> + device_type = "cpu"; >>>> + compatible = "arm,cortex-a53", "arm,armv8"; >>>> + reg = <0x1>; >>>> + }; >>>> + >>>> + CPU2: cpu at 2 { >>>> + device_type = "cpu"; >>>> + compatible = "arm,cortex-a53", "arm,armv8"; >>>> + reg = <0x2>; >>>> + }; >>>> + >>>> + CPU3: cpu at 3 { >>>> + device_type = "cpu"; >>>> + compatible = "arm,cortex-a53", "arm,armv8"; >>>> + reg = <0x3>; >>>> + }; >>>> + }; >>> >>> The secondary CPUs need an enable-method. Are you using PSCI or >>> spin-table? >> >> This is on purpose. We aren?t using either PSCI or spin-table. Right >> now the dts is for booting on a single core. I can drop CPU1..CPU3 if >> that helps. > > We won't poke the CPUs without an enable-method, so personally I'm not > too worried either way about having the CPUs listed. That was my thinking, so left them in. > Which of spin-table/psci are you planning on using for SMP support, and > when would that be likely to appear? We have a qcom specific SMP enablement method for this device. This was one of our first devices so it utilized as much from arm 32-bit as possible. > Which exception level do CPUs enter the kernel? Even without a > virt-capable GIC booting at EL2 is less work for the FW and gives the > kernel a better chance of fixing things up (e.g. CNTVOFF). I think the enter in EL1. - k -- Qualcomm Innovation Center, Inc. The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project
next prev parent reply other threads:[~2015-03-12 19:54 UTC|newest] Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top 2015-03-11 20:51 [PATCH v3 1/4] arm64: qcom: Add support for Qualcomm MSM8916 SoC Kumar Gala 2015-03-11 20:51 ` Kumar Gala 2015-03-11 20:51 ` [PATCH v3 2/4] arm64: dts: Add Qualcomm MSM8916 SoC and evaluation board dts Kumar Gala 2015-03-11 20:51 ` Kumar Gala 2015-03-12 17:05 ` Mark Rutland 2015-03-12 17:05 ` Mark Rutland 2015-03-12 17:05 ` Mark Rutland 2015-03-12 17:33 ` Kumar Gala 2015-03-12 17:33 ` Kumar Gala 2015-03-12 17:33 ` Kumar Gala 2015-03-12 18:25 ` Mark Rutland 2015-03-12 18:25 ` Mark Rutland 2015-03-12 18:25 ` Mark Rutland 2015-03-12 19:54 ` Kumar Gala [this message] 2015-03-12 19:54 ` Kumar Gala 2015-03-12 19:54 ` Kumar Gala [not found] ` <F0B0524B-AC0E-4E60-9A21-1208C4A978F5-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org> 2015-03-13 10:34 ` Mark Rutland 2015-03-13 10:34 ` Mark Rutland 2015-03-13 10:34 ` Mark Rutland 2015-03-13 12:07 ` Catalin Marinas 2015-03-13 12:07 ` Catalin Marinas 2015-03-13 12:07 ` Catalin Marinas 2015-03-11 20:51 ` [PATCH v3 3/4] devicetree: bindings: Document qcom,msm-id and qcom,board-id Kumar Gala 2015-03-11 20:51 ` [PATCH v3 3/4] devicetree: bindings: Document qcom, msm-id and qcom, board-id Kumar Gala 2015-03-11 20:51 ` [PATCH v3 4/4] arm64: dts: Add Qualcomm MSM8916 & MTP8916 ids Kumar Gala 2015-03-11 20:51 ` Kumar Gala
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