linux-kernel - [PATCH 0/2] mailbox: imx: support RST channel

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Message-Id: <20220517073518.34474-1-peng.fan@oss.nxp.com>
Date:   Tue, 17 May 2022 15:35:16 +0800
From:   "Peng Fan (OSS)" <peng.fan@....nxp.com>
To:     robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        shawnguo@...nel.org, s.hauer@...gutronix.de
Cc:     kernel@...gutronix.de, festevam@...il.com, linux-imx@....com,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, Peng Fan <peng.fan@....com>
Subject: [PATCH 0/2] mailbox: imx: support RST channel

From: Peng Fan <peng.fan@....com>

To i.MX generic MU, when linux stop remote core, the MU-B side is not
reset because of hardware design, so MU-B contains valid configuration
when remote core stops. Then when linux start remote core again,
linux may notify remote core before remote core is ready for incoming
message. So we need make sure MU is in reset state before remote core
start. So add a RST channel which is only to reset MU when shutdown
the RST mbox channel.

Peng Fan (2):
  dt-bindings: mailbox: imx-mu: add RST channel
  mailbox: imx: support RST channel

 .../devicetree/bindings/mailbox/fsl,mu.yaml   |  6 ++--
 drivers/mailbox/imx-mailbox.c                 | 29 +++++++++++++++----
 2 files changed, 27 insertions(+), 8 deletions(-)

-- 
2.25.1