From: Stephen Warren <swarren@wwwdotorg.org>
To: Jassi Brar <jassisinghbrar@gmail.com>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Joseph Lo <josephl@nvidia.com>
Subject: Using the mailbox subsystem for plain doorbells?
Date: Mon, 9 May 2016 17:45:14 -0600 [thread overview]
Message-ID: <5731210A.4000401@wwwdotorg.org> (raw)
Jassi,
Does the HW described below sound like something that should be
represented using the Linux kernel's mailbox subsystem, and related DT
bindings? I think the existing drivers/mailbox/pcc.c is similar, but
wanted to double-check.
We have some HW that literally just allows a SW-generated interrupt to
be generated by our main CPU complex to an auxiliary CPU, and likewise a
different interrupt can be generated in the opposite direction. There's
no ability to transfer any data; just an IRQ is generated. Our current
mailbox implementation just handles IRQ generation/reception so struct
mbox_chan_ops.send_data completely ignores the data parameter, and our
IRQ handler "receives" hard-coded NULL messages when the IRQ fires.
Higher level protocol code (using shared memory along with the plain-IRQ
mbox channels) is outside the mailbox driver.
Does that fit the mailbox subsystem?
next reply other threads:[~2016-05-09 23:45 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-09 23:45 Stephen Warren [this message]
2016-05-10 3:29 ` Using the mailbox subsystem for plain doorbells? Jassi Brar
2016-05-10 15:56 ` Stephen Warren
2016-05-10 16:10 ` Jassi Brar
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