linux-kernel - [RFC PATCH 2/2] docs: networking: device drivers: can: add flexcan

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Message-Id: <20220107081306.3681899-3-dario.binacchi@amarulasolutions.com>
Date:   Fri,  7 Jan 2022 09:13:06 +0100
From:   Dario Binacchi <dario.binacchi@...rulasolutions.com>
To:     linux-kernel@...r.kernel.org
Cc:     Marc Kleine-Budde <mkl@...gutronix.de>, linux-can@...r.kernel.org,
        Dario Binacchi <dario.binacchi@...rulasolutions.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Jonathan Corbet <corbet@....net>, linux-doc@...r.kernel.org,
        netdev@...r.kernel.org
Subject: [RFC PATCH 2/2] docs: networking: device drivers: can: add flexcan

Add initial documentation for Flexcan driver.

Signed-off-by: Dario Binacchi <dario.binacchi@...rulasolutions.com>

---

 .../device_drivers/can/freescale/flexcan.rst  | 25 +++++++++++++++++++
 .../networking/device_drivers/can/index.rst   |  2 ++
 2 files changed, 27 insertions(+)
 create mode 100644 Documentation/networking/device_drivers/can/freescale/flexcan.rst

diff --git a/Documentation/networking/device_drivers/can/freescale/flexcan.rst b/Documentation/networking/device_drivers/can/freescale/flexcan.rst
new file mode 100644
index 000000000000..1a5bb2ed08a3
--- /dev/null
+++ b/Documentation/networking/device_drivers/can/freescale/flexcan.rst
@@ -0,0 +1,25 @@
+.. SPDX-License-Identifier: GPL-2.0+
+
+=============================
+Flexcan CAN Controller driver
+=============================
+
+Authors: Marc Kleine-Budde <mkl@...gutronix.de>,
+Dario Binacchi <dario.binacchi@...rula.solutions.com>
+
+On/off RTR frames reception
+===========================
+
+ 1. interface down::
+
+      ethtool --set-priv-flags can0 rx-rtr {off|on}
+
+ 2. interface up::
+
+      ip link set dev can0 down
+      ethtool --set-priv-flags can0 rx-rtr {off|on}
+      ip link set dev can0 up
+
+Note. For the Flexcan on i.MX25, i.Mx28, i.MX35 and i.Mx53 SOCs, the reception
+of RTR frames is possible only if the controller is configured in RxFIFO mode.
+In this mode only 6 of the 64 message buffers are used for reception.
diff --git a/Documentation/networking/device_drivers/can/index.rst b/Documentation/networking/device_drivers/can/index.rst
index 218276818968..58b6e0ad3030 100644
--- a/Documentation/networking/device_drivers/can/index.rst
+++ b/Documentation/networking/device_drivers/can/index.rst
@@ -10,6 +10,8 @@ Contents:
 .. toctree::
    :maxdepth: 2
 
+   freescale/flexcan
+
 .. only::  subproject and html
 
    Indices
-- 
2.32.0