linux-kernel - Re: [PATCH 4/4] DO_NOT_MERGE arm64: dts: ti: Enable MCU MCANs for AM62x

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Message-ID: <ZIxO/uo7FICKsmdb@francesco-nb.int.toradex.com>
Date:   Fri, 16 Jun 2023 14:01:02 +0200
From:   Francesco Dolcini <francesco@...cini.it>
To:     Judith Mendez <jm@...com>
Cc:     Chandrasekar Ramakrishnan <rcsekar@...sung.com>,
        Wolfgang Grandegger <wg@...ndegger.com>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Schuyler Patton <spatton@...com>, Nishanth Menon <nm@...com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Tero Kristo <kristo@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Oliver Hartkopp <socketcan@...tkopp.net>,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-can@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH 4/4] DO_NOT_MERGE arm64: dts: ti: Enable MCU MCANs for
 AM62x

On Wed, Apr 19, 2023 at 05:33:23PM -0500, Judith Mendez wrote:
> On AM62x there are no hardware interrupts routed to GIC interrupt
> controller for MCU MCAN IP, A53 Linux cannot receive hardware
> interrupts. Since an hrtimer will be used to generate software
> interrupts, add MCU MCAN nodes to dtsi and default to disabled.
> 
> AM62x does not carry on-board CAN transceivers, so instead of
> changing DTB permanently use an overlay to enable MCU MCANs and to
> add CAN transceiver nodes.
> 
> If an hrtimer is used to generate software interrupts, the two
> required interrupt attributes in the MCAN node do not have to be
> included.
> 
> Signed-off-by: Judith Mendez <jm@...com>

[...]

> +	mcu_mcan1: can@...0000 {
this should be mcu_mcan0

> +		compatible = "bosch,m_can";
> +		reg = <0x00 0x4e00000 0x00 0x8000>,
> +			  <0x00 0x4e08000 0x00 0x200>;

[...]

> +	mcu_mcan2: can@...0000 {
mcu_mcan1

> +		compatible = "bosch,m_can";
> +		reg = <0x00 0x4e10000 0x00 0x8000>,
> +			  <0x00 0x4e18000 0x00 0x200>;

Francesco