lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:	Thu, 17 Jul 2014 17:40:09 +0200
From:	Javier Martinez Canillas <>
To:	Doug Anderson <>,
	Dmitry Eremin-Solenikov <>,
	David Woodhouse <>,
	Andrew Morton <>,
	Sebastian Reichel <>
CC:, Sachin Kamat <>,,,,,
	Anton Vorontsov <>,
Subject: Re: [RESEND PATCH v3] charger: tps65090: Allow charger module to
 be used when no irq

Hello Doug,

On 06/20/2014 11:42 PM, Doug Anderson wrote:
> On the ARM Chromebook tps65090 has two masters: the AP (the main
> processor running linux) and the EC (the embedded controller).  The AP
> is allowed to mess with FETs but the EC is in charge of charge control.
> The tps65090 interupt line is routed to both the AP and the EC, which
> can cause quite a headache.  Having two people adjusting masks and
> acking interrupts is a recipe for disaster.
> In the shipping kernel we had a hack to have the AP pay attention to
> the IRQ but not to ack it.  It also wasn't supposed to configure the
> IRQ in any way.  That hack allowed us to detect when the device was
> charging without messing with the EC's state.
> The current tps65090 infrastructure makes the above difficult, and it
> was a bit of a hack to begin with.  Rather than uglify the driver to
> support it, just extend the driver's existing notion of "no irq" to
> the charger.  This makes the charger code poll every 2 seconds for AC
> detect, which is sufficient.
> For proper functioning, requires (mfd: tps65090: Don't tell child
> devices we have an IRQ if we don't).  If we don't have that patch
> we'll simply fail to probe on devices without an interrupt (just like
> we did before this patch).
> Signed-off-by: Doug Anderson <>
> ---
> Changes in v2:
> - Split noirq (polling mode) changes into MFD and charger
> This patch has been sent up a number of times with no response.  It's
> needed to make the charger work on exynos5250-snow,
> exynos5420-peach-pit, and exynos5800-peach-pi.  It was originally part
> of a series as <> and the
> rest of the series has long since landed.

Looks good to me. Also since this patch makes optional to get an IRQ, the
following annoying message is not shown anymore:

[    2.132944] tps65090-charger tps65090-charger: Unable to get charger irq = -6

Reviewed-by: Javier Martinez Canillas <>
Tested-by: Javier Martinez Canillas <>
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

Powered by blists - more mailing lists