linux-kernel - Re: [PATCH 1/4] regmap: irq: Fix lost interrupts by introducing handle

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Date:   Mon, 20 Mar 2017 15:14:13 +0000
From:   Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
To:     Tony Lindgren <tony@...mide.com>
CC:     Mark Brown <broonie@...nel.org>, <linux-kernel@...r.kernel.org>,
        <linux-omap@...r.kernel.org>, Lee Jones <lee.jones@...aro.org>,
        Marcel Partap <mpartap@....net>,
        Michael Scott <michael.scott@...aro.org>,
        "Sebastian Reichel" <sre@...nel.org>
Subject: Re: [PATCH 1/4] regmap: irq: Fix lost interrupts by introducing
 handle_reread

On Thu, Mar 16, 2017 at 05:36:30PM -0700, Tony Lindgren wrote:
> At least Motorola CPCAP PMIC needs it's device interrupts re-read
> until there are no more interrupts. Otherwise the PMIC interrupt to
> the SoC will eventually stop toggling.
> 
> Let's allow doing that by introducing a flag for handle_reread
> and by splitting regmap_irq_thread() into two separate functions
> for regmap_read_irq_status() and regmap_irq_handle_pending().
> 

Is this actually a property of this hardware or is this just a
result of connecting a device that generates level IRQs to a host
that is expecting an edge triggered IRQ?

Thanks,
Charles