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

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Message-ID: <20230531043040.GQ14287@atomide.com>
Date: Wed, 31 May 2023 07:30:40 +0300
From: Tony Lindgren <tony@...mide.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>
Subject: Re: [PATCH v8 2/2] can: m_can: Add hrtimer to generate software
 interrupt

* Judith Mendez <jm@...com> [230530 22:48]:
> 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.

Reviewed-by: Tony Lindgren <tony@...mide.com>