linux-kernel - [PATCH v3 0/3] mailbox: Allow direct registration to a channel

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Date:   Mon, 10 Apr 2023 09:16:51 -0700
From:   Elliot Berman <quic_eberman@...cinc.com>
To:     Jassi Brar <jassisinghbrar@...il.com>
CC:     Elliot Berman <quic_eberman@...cinc.com>,
        Sudeep Holla <sudeep.holla@....com>,
        <linux-kernel@...r.kernel.org>, <linux-acpi@...r.kernel.org>,
        <linux-arm-msm@...r.kernel.org>
Subject: [PATCH v3 0/3] mailbox: Allow direct registration to a channel

Two mailbox controllers have channel/client binding mechanisms that are
controller-specific and not using the devicetree binding mechanisms. Mailbox
channel/client is conceptually done in two steps: selecting the channel
and binding the selected to channel to a client. Channel selection is sometimes
controller specific (pcc and omap are examples). The channel/client binding
code is all the same.

This small series de-duplicates and refactors the channel/client binding
into a common framework function: "mbox_bind_client" which all of the
channel selection mechanisms can use.

I found this duplicate code while working on the support for Gunyah hypervisor
message queues [1]. I've only been able to compile-test omap-mailbox and pcc,
however it is a straightforward conversion here.

[1]: https://lore.kernel.org/all/20230120224627.4053418-9-quic_eberman@quicinc.com/

Chagnes since v2:
 - Fix warnings in drivers/mailbox/pcc.c reported by lkp@...el.com

Changes since v1:
 - Rebase to https://git.linaro.org/landing-teams/working/fujitsu/integration.git/log/?h=mailbox-for-next
 - Add Tested-By from Sudeep (thanks!)

Elliot Berman (3):
  mailbox: Allow direct registration to a channel
  mailbox: omap: Use mbox_bind_client
  mailbox: pcc: Use mbox_bind_client

 drivers/mailbox/mailbox.c      | 96 ++++++++++++++++++++++++----------
 drivers/mailbox/omap-mailbox.c | 22 ++------
 drivers/mailbox/pcc.c          | 84 +++++++++++++++--------------
 include/linux/mailbox_client.h |  1 +
 4 files changed, 118 insertions(+), 85 deletions(-)

base-commit: 6ccbe33a39523f6d62b22c5ee99c6695993c935e
-- 
2.39.2