> Subject: Re: [PATCH v11 2/2] mailbox: introduce ARM SMC based mailbox > > (+Viresh,Arnd) > > On Mon, Dec 02, 2019 at 10:14:43AM +0000, Peng Fan wrote: > > From: Peng Fan <peng.fan@xxxxxxx> > > > > This mailbox driver implements a mailbox which signals transmitted > > data via an ARM smc (secure monitor call) instruction. The mailbox > > receiver is implemented in firmware and can synchronously return data > > when it returns execution to the non-secure world again. > > An asynchronous receive path is not implemented. > > This allows the usage of a mailbox to trigger firmware actions on SoCs > > which either don't have a separate management processor or on which > > such a core is not available. A user of this mailbox could be the SCP > > interface. > > > > I would like to know all the use-cases for this driver ? Currently my usecase is SCMI. Is this only for SCMI or > will this get used with other protocols on the top. I assume the latter and > hence it is preferred to keep this as a mailbox driver. > > I am not against this approach but the reason I ask is to avoid duplication. > Viresh has suggested abstraction of transport from SCMI driver to enable > other transports[1]. Couple of transports that I am aware of is this SMC/HVC > and the new(still in-concept) SPCI. > > So I am looking for opinions on that approach. Please feel free to comment > here or as part of that patch. If we want to use SMC as transports, smc mailbox or smc transports(non-mailbox) could be used. Both ok for me, smc transports just need write a new driver under scmi folder. I left the decision to you(scmi maintainer) and Jassi(mailbox maintainer), Just hope the smc/hvc used as transports could be landed in upstream soon. Thanks, Peng. > > -- > Regards, > Sudeep > > [1] > https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flore.ke > rnel.org%2Flkml%2F5c545c2866ba075ddb44907940a1dae1d823b8a1.15750 > 19719.git.viresh.kumar%40linaro.org&data=02%7C01%7Cpeng.fan%40n > xp.com%7C06edb0c37371419db3cd08d777e66780%7C686ea1d3bc2b4c6fa9 > 2cd99c5c301635%7C0%7C1%7C637109703766574454&sdata=nInLSUu > mwzBvl%2FcmckQkpZbJT4JAtVkzr1TSWkmz6qo%3D&reserved=0
