From mboxrd@z Thu Jan 1 00:00:00 1970 From: catalin.marinas@arm.com (Catalin Marinas) Date: Fri, 15 Aug 2014 16:28:32 +0100 Subject: [PATCH 4/6] arm64: Add DTS support for FSL's LS2085A SoC In-Reply-To: <29cf47df79b145ea928da6944ff3de57@BN1PR03MB220.namprd03.prod.outlook.com> References: <1408096156-29772-1-git-send-email-bhupesh.sharma@freescale.com> <1408096156-29772-5-git-send-email-bhupesh.sharma@freescale.com> <20140815101249.GA19939@localhost> <20140815131026.GB18863@arm.com> <29cf47df79b145ea928da6944ff3de57@BN1PR03MB220.namprd03.prod.outlook.com> Message-ID: <20140815152832.GE18863@arm.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Fri, Aug 15, 2014 at 03:31:48PM +0100, bhupesh.sharma at freescale.com wrote: > > On Fri, Aug 15, 2014 at 01:53:13PM +0100, Stuart Yoder wrote: > > > > On Fri, Aug 15, 2014 at 10:49:13AM +0100, Bhupesh Sharma wrote: > > > > > + cpus { > > > > > + #address-cells = <2>; > > > > > + #size-cells = <0>; > > > > > + > > > > > + /* We have 4 clusters having 2 Cortex-A57 cores each */ > > > > > + cpu at 0 { > > > > > + device_type = "cpu"; > > > > > + compatible = "arm,cortex-a57"; > > > > > + reg = <0x0 0x0>; > > > > > + enable-method = "spin-table"; > > > > > + cpu-release-addr = <0x0 0x8000fff8>; > > > > > + }; > > > > > > > > Why not PSCI? > > > > > > It simply is where we are today-- we don't have functioning PSCI yet > > > but plan to get there over time. > > > > Thanks for clarification. > > > > > All the existing device trees > > > in arch/arm64 use "spin-table", so it seems that other platforms are > > > in the same situation: > > > apm-storm.dtsi > > > > Not possible because there is no EL3 mode on the CPU implementation. > > > > > foundation-v8.dts > > > rtsm_ve-aemv8a.dts > > > > These work with the latest boot wrapper (which overrides the DT nodes and > > passes the PSCI information). > > Right. We are working on our PSCI handler implementation in EL3 and the spin-table > approach it something we are currently supporting on the simulator model using > u-boot bootloader setting up the spin-tables. > > Our patches for implementing spin-table approach in armv8 u-boot are already under > review and corresponding rework [1]. It would be better if you helped with this effort to bring PSCI to U-Boot (ARMv7 currently but easy to port to AArch64): https://git.kernel.org/cgit/linux/kernel/git/maz/u-boot.git/log/?h=wip/psci-v4 https://git.kernel.org/cgit/linux/kernel/git/maz/u-boot.git/log/?h=wip/psci-v4-a20 -- Catalin