netdev - Re: [PATCH v8 2/2] can: m_can: Add hrtimer to generate software interrupt

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Date: Thu, 15 Jun 2023 14:02:39 +0200
From: Hiago Franco <hiagofranco@...il.com>
To: Judith Mendez <jm@...com>
Cc: Chandrasekar Ramakrishnan <rcsekar@...sung.com>, linux-can@...r.kernel.org, 
	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>, netdev@...r.kernel.org, 
	linux-kernel@...r.kernel.org, Schuyler Patton <spatton@...com>, 
	Tero Kristo <kristo@...nel.org>, Rob Herring <robh+dt@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, devicetree@...r.kernel.org, 
	Oliver Hartkopp <socketcan@...tkopp.net>, Simon Horman <simon.horman@...igine.com>, 
	Conor Dooley <conor+dt@...aro.org>, Tony Lindgren <tony@...mide.com>
Subject: Re: [PATCH v8 2/2] can: m_can: Add hrtimer to generate software interrupt

On Wed, May 31, 2023 at 12:51 AM Judith Mendez <jm@...com> wrote:
>
> Introduce timer polling method to MCAN since some SoCs may not
> have M_CAN interrupt routed to A53 Linux and do not have
> interrupt property in device tree M_CAN node.
>
> On AM62x SoC, MCANs on MCU domain do not have hardware interrupt
> routed to A53 Linux, instead they will use timer polling method.
>
> Add an hrtimer to MCAN class device. Each MCAN will have its own
> hrtimer instantiated if there is no hardware interrupt found in
> device tree M_CAN node. The timer will generate a software
> interrupt every 1 ms. In hrtimer callback, we check if there is
> a transaction pending by reading a register, then process by
> calling the isr if there is.
>
> Signed-off-by: Judith Mendez <jm@...com>

Tested-by: Hiago De Franco <hiago.franco@...adex.com> # Toradex Verdin AM62