From mboxrd@z Thu Jan 1 00:00:00 1970 From: sudeep.holla@arm.com (Sudeep Holla) Date: Thu, 12 Jul 2018 11:32:05 +0100 Subject: [PATCH V4 0/5] soc: imx: add scu firmware api support In-Reply-To: References: <1531061817-1980-1-git-send-email-aisheng.dong@nxp.com> <24505e51-3a5d-4f34-7ba6-262e118d070e@arm.com> Message-ID: <73f7f126-6497-7ae9-49b2-082fbc18508d@arm.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On 12/07/18 04:46, A.s. Dong wrote: > Hi Sudeep, > >> -----Original Message----- >> From: Sudeep Holla [mailto:sudeep.holla at arm.com] >> Sent: Thursday, July 12, 2018 12:49 AM >> To: A.s. Dong ; linux-arm- >> kernel at lists.infradead.org >> Cc: Sudeep Holla ; dongas86 at gmail.com; dl-linux- >> imx ; kernel at pengutronix.de; Fabio Estevam >> ; shawnguo at kernel.org; Cl?ment Faure >> >> Subject: Re: [PATCH V4 0/5] soc: imx: add scu firmware api support >> >> On 08/07/18 15:56, Dong Aisheng wrote: >>> Unlike the former i.MX Architectures, the new generation i.MX8 SoCs >>> (e.g. MX8QXP and MX8QM) contain a system controller which runs on a >>> dedicated Cortex-M core to provide power, clock, Pad, and resource >>> management. Communication between the host processor running an OS >> and >>> the system controller happens through a SCU protocol. >>> This patchset adds the SCU APIs which is implemented based on MU and >>> will be used by different system components. >>> >>> It mainly consists of below parts: >>> 1) MU mailbox driver >>> 1) Implementation of the IPC functions based on MUs (client side). >>> >>> >> >> I do understand the firmware might be already released for the current >> generation of platforms, but instead of adding to the fragmentation, it would >> be good to migrated to ARM SCMI for future platforms. >> >> This system controller communication protocol is already so fragmented (we >> have TI SCI, QCOM RPM, Nvidia Tegra BPMP, ARM SCPI and so on.. >> and now this i.MX specific one added to that), the main intention of ARM >> SCMI is to stop that. The idea is for any Power Control System >> Architecture(PCSA) compliant systems or any similar systems, SCMI should >> be the standard communication protocol. > > That sounds good and worth a look. > Copy SCU firmware guys if more comments. > BTW, i.MX SCU provides more services than just power related. > Not sure if ARM SCMI can cover it. > Sure, we can extend the specification to cover those as generic protocols. If they are too NXP specific, then SCMI has options to use vendor specific protocols. I am interested to know the requirements. -- Regards, Sudeep