linux-kernel - Re: [RFT v2 03/10] pinctrl: samsung: Document hidden requirement about one external wakeup

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Date:   Wed, 25 Jul 2018 11:38:23 -0600
From:   Rob Herring <robh@...nel.org>
To:     Krzysztof Kozlowski <krzk@...nel.org>
Cc:     Tomasz Figa <tomasz.figa@...il.com>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        Kukjin Kim <kgene@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-gpio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Paweł Chmiel <pawel.mikolaj.chmiel@...il.com>,
        Sylwester Nawrocki <snawrocki@...nel.org>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Pankaj Dubey <pankaj.dubey@...sung.com>
Subject: Re: [RFT v2 03/10] pinctrl: samsung: Document hidden requirement
 about one external wakeup

On Mon, Jul 23, 2018 at 07:52:55PM +0200, Krzysztof Kozlowski wrote:
> Hardware (S5Pv210 and all Exynos SoCs) provides only 32 external
> interrupts which can wakeup device from deep sleep modes.  On S5Pv210
> these are gph0-gph3.  On all Exynos designs these are gpx0-gpx3.
> There is only one 32-bit register for controlling the external wakeup
> interrupt mask (masking and unmasking waking capability of these
> interrupts).
> 
> This lead to implementation in pinctrl driver and machine code which was
> using static memory for storing the mask value and not caring about
> multiple devices of pin controller... because only one pin controller
> device will be handling this.
> 
> Since each pin controller node in Device Tree maps onto one device, this
> corresponds to hidden assumption in parsing the Device Tree: external
> wakeup interrupts can be defined only once.  Make this assumption an
> explicit requirement.
> 
> Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>
> Cc: Tomasz Figa <tomasz.figa@...il.com>
> Cc: Sylwester Nawrocki <snawrocki@...nel.org>
> Acked-by: Tomasz Figa <tomasz.figa@...il.com>
> ---
>  Documentation/devicetree/bindings/pinctrl/samsung-pinctrl.txt | 9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)

Reviewed-by: Rob Herring <robh@...nel.org>