Hi Sudeep, > -----Original Message----- > From: Sudeep Holla [mailto:sudeep.holla@xxxxxxx] > Sent: Thursday, March 08, 2018 3:48 AM > To: Jolly Shah <JOLLYS@xxxxxxxxxx> > Cc: gregkh@xxxxxxxxxxxxxxxxxxx; matt@xxxxxxxxxxxxxxxxxxx; > hkallweit1@xxxxxxxxx; michal.simek@xxxxxxxxxx; robh+dt@xxxxxxxxxx; > mark.rutland@xxxxxxx; Sudeep Holla <sudeep.holla@xxxxxxx>; > ard.biesheuvel@xxxxxxxxxx; mingo@xxxxxxxxxx; keescook@xxxxxxxxxxxx; > dmitry.torokhov@xxxxxxxxx; Rajan Vaja <RAJANV@xxxxxxxxxx>; linux-arm- > kernel@xxxxxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; > devicetree@xxxxxxxxxxxxxxx > Subject: Re: [PATCH v5 1/4] dt-bindings: firmware: Add bindings for ZynqMP > firmware > > > > On 07/03/18 22:25, Jolly Shah wrote: > > Hi Sudeep, > > > > [...] > > >>> +Examples: > >>> + firmware { > >>> + zynqmp_firmware: zynqmp-firmware { > >>> + compatible = "xlnx,zynqmp-firmware"; > >>> + method = "smc"; > >>> + }; > >>> + }; > >>> > >> > >> Do you foresee using SMC/HVC for this firmware even on future platforms? > >> If not, I suggest to keep the protocol part separate from the transport i.e. > >> smc/hvc via ATF. It could be replaced with mailbox or some h/w > >> mechanism in future ? > >> > > > > We have PSCI and EEMI interfaces exposed to linux from ATF. PSCI is an > > EEMI client. We do not have current plans to switch to mailbox as it > > will require 2 communication channels to PMU as PSCI is through ATF. > > > > OK, but I just saw some bindings that has mailbox interface, honestly it's getting > too confusing with multiple series on the same thing floating and hence I > requested to put it together as one series. Mailbox binding is used for power management driver. Mailbox is only used for PMU->APU communication. APU->PMU communication is always through EEMI firmware interface which is using SMC/HVC. > -- > Regards, > Sudeep ��.n��������+%������w��{.n����z�{��ܨ}���Ơz�j:+v�����w����ޙ��&�)ߡ�a����z�ޗ���ݢj��w�f
