linux-kernel - Re: [PATCH 4/4] pinctrl: iproc: Allow PINCONF to be disabled completely

lists.openwall.net		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 linux-cve-announce 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:	Mon, 18 Apr 2016 12:30:26 -0700
From:	Ray Jui <ray.jui@...adcom.com>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	Alexandre Courbot <gnurou@...il.com>,
	Rob Herring <robh+dt@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	bcm-kernel-feedback-list <bcm-kernel-feedback-list@...adcom.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH 4/4] pinctrl: iproc: Allow PINCONF to be disabled
 completely

Hi Linus,

On 4/15/2016 1:24 AM, Linus Walleij wrote:
> On Wed, Apr 13, 2016 at 2:15 AM, Ray Jui <ray.jui@...adcom.com> wrote:
>
>> In some of the future iProc based SoCs, pinconf is handled by another
>> block and the iProc GPIO controller is solely used as a GPIO controller.
>> This patch adds support of a new compatible string "brcm,iproc-gpio-only",
>> that is introduced to handle this case, where pinconf functions in this
>> driver are completely disabled
>>
>> Signed-off-by: Ray Jui <ray.jui@...adcom.com>
>> Reviewed-by: Yendapally Reddy Dhananjaya Reddy <yendapally.reddy@...adcom.com>
>> Reviewed-by: Jon Mason <jon.mason@...adcom.com>
>> Reviewed-by: Scott Branden <scott.branden@...adcom.com>
>
> If this was entirely true, then the driver should end up only executing
> [devm_]gpiochip_add_data() but that does not seem to be the case.

Yes, in the case of compatible string "brcm,iproc-gpio-only" is 
detected, the driver only registers 'gpiochip_add_data'. Please check 
patch 2/4 of this series, which takes care of it.

>
> You are still registering a pin controller, right? Just disabling some of
> the pin config options. The pin multiplexing is still there, right?
> Then it is not "solely a GPIO controller". Not at all.

This driver does not register itself as a PINCONF driver if 
"brcm,iproc-gpio-only" compatible string is detected. This is addressed 
in patch 2/4 of this series.

Pin based IOMUX GPIO override is only activated when 
'chip->pinmux_is_supported' is true, and it is only true if the optional 
DT property "gpio-ranges" is defined.

>
> This patch set needs some elaboration I think.
>
> Yours,
> Linus Walleij
>

I believe the current issue with this patch series is now only on the 
naming of the new compatible string "brcm,iproc-gpio-only". Please 
correct me if I'm wrong.

Thanks,

Ray