From: Jassi Brar <jassisinghbrar@gmail.com>
To: Sudeep Holla <sudeep.holla@arm.com>
Cc: Peng Fan <peng.fan@nxp.com>,
"robh+dt@kernel.org" <robh+dt@kernel.org>,
"mark.rutland@arm.com" <mark.rutland@arm.com>,
"andre.przywara@arm.com" <andre.przywara@arm.com>,
"f.fainelli@gmail.com" <f.fainelli@gmail.com>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
dl-linux-imx <linux-imx@nxp.com>
Subject: Re: [PATCH v5 1/2] dt-bindings: mailbox: add binding doc for the ARM SMC/HVC mailbox
Date: Fri, 30 Aug 2019 11:51:59 -0500 [thread overview]
Message-ID: <CABb+yY1cpGVHvHz4MCwpmVXSYayWt3HWMLJKZTrCb_LXroBc_Q@mail.gmail.com> (raw)
In-Reply-To: <20190830093224.GB31297@bogus>
On Fri, Aug 30, 2019 at 4:32 AM Sudeep Holla <sudeep.holla@arm.com> wrote:
>
> On Fri, Aug 30, 2019 at 02:52:40AM -0500, Jassi Brar wrote:
> > On Fri, Aug 30, 2019 at 2:37 AM Peng Fan <peng.fan@nxp.com> wrote:
>
> [...]
>
> > >
> > > If I get your point correctly,
> > > On UP, both could not be active. On SMP, tx/rx could be both active, anyway
> > > this depends on secure firmware and Linux firmware design.
> > >
> > > Do you have any suggestions about arm,func-ids here?
> > >
> > I was thinking if this is just an instruction, why can't each channel
> > be represented as a controller, i.e, have exactly one func-id per
> > controller node. Define as many controllers as you need channels ?
> >
>
> I might have missed to follow this, but what's the advantage of doing so ?
> Which can't single controller instance deal with all the channels ?
>
There are many advantages ...
1) Design reflects the reality - two smc/hvc instructions have nothing
tying them together.
2) Driver code becomes simpler - don't have to pre-populate channels,
deducting from the size of func-ids array.
3) Driver becomes more flexible - We can have channels that pass
func-id runtime and channels that pass via DT (if we must have the
option of DT property).
-jassi
next prev parent reply other threads:[~2019-08-30 16:52 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-28 3:02 [PATCH v5 0/2] mailbox: arm: introduce smc triggered mailbox Peng Fan
2019-08-28 3:02 ` [PATCH v5 1/2] dt-bindings: mailbox: add binding doc for the ARM SMC/HVC mailbox Peng Fan
2019-08-28 13:58 ` Sudeep Holla
2019-08-30 2:47 ` Peng Fan
2019-08-30 5:58 ` Jassi Brar
2019-08-30 6:28 ` Peng Fan
2019-08-30 7:21 ` Jassi Brar
2019-08-30 7:37 ` Peng Fan
2019-08-30 7:52 ` Jassi Brar
2019-08-30 8:07 ` Peng Fan
2019-08-30 8:12 ` Jassi Brar
2019-08-30 8:28 ` Peng Fan
2019-09-09 13:32 ` Andre Przywara
2019-09-11 2:27 ` Peng Fan
2019-09-11 2:36 ` Jassi Brar
2019-09-11 11:42 ` Andre Przywara
2019-08-30 9:32 ` Sudeep Holla
2019-08-30 16:51 ` Jassi Brar [this message]
2019-08-30 9:30 ` Sudeep Holla
2019-08-30 9:40 ` Peng Fan
2019-09-02 13:39 ` Rob Herring
2019-09-02 14:20 ` Rob Herring
2019-09-09 15:42 ` Andre Przywara
2019-09-11 2:44 ` Jassi Brar
2019-09-11 15:03 ` Andre Przywara
2019-09-11 16:55 ` Jassi Brar
2019-09-12 3:05 ` Peng Fan
2019-08-28 3:03 ` [PATCH v5 2/2] mailbox: introduce ARM SMC based mailbox Peng Fan
2019-08-28 14:02 ` Sudeep Holla
2019-08-30 2:50 ` Peng Fan
2019-09-09 15:42 ` Andre Przywara
2019-09-11 5:58 ` Peng Fan
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