linux-kernel - Re: [PATCH v6 1/4] gpio: mvebu: Add limited PWM support

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Message-ID: <CACRpkdYPp6pBemTT_a4V6a-Qbk2475qOOxWJOhfVaEz=cojOvA@mail.gmail.com>
Date:   Mon, 24 Apr 2017 11:18:30 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Ralph Sennhauser <ralph.sennhauser@...il.com>
Cc:     "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        Andrew Lunn <andrew@...n.ch>,
        Thierry Reding <thierry.reding@...il.com>,
        Alexandre Courbot <gnurou@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Jason Cooper <jason@...edaemon.net>,
        Gregory Clement <gregory.clement@...e-electrons.com>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "linux-pwm@...r.kernel.org" <linux-pwm@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v6 1/4] gpio: mvebu: Add limited PWM support

On Fri, Apr 14, 2017 at 5:40 PM, Ralph Sennhauser
<ralph.sennhauser@...il.com> wrote:

> From: Andrew Lunn <andrew@...n.ch>
>
> Armada 370/XP devices can 'blink' GPIO lines with a configurable on
> and off period. This can be modelled as a PWM.
>
> However, there are only two sets of PWM configuration registers for
> all the GPIO lines. This driver simply allows a single GPIO line per
> GPIO chip of 32 lines to be used as a PWM. Attempts to use more return
> EBUSY.
>
> Due to the interleaving of registers it is not simple to separate the
> PWM driver from the GPIO driver. Thus the GPIO driver has been
> extended with a PWM driver.
>
> Signed-off-by: Andrew Lunn <andrew@...n.ch>
> URL: https://patchwork.ozlabs.org/patch/427287/
> URL: https://patchwork.ozlabs.org/patch/427295/
> [Ralph Sennhauser:
>   * Port forward
>   * Merge PWM portion into gpio-mvebu.c
>   * Switch to atomic PWM API
>   * Add new compatible string marvell,armada-370-xp-gpio
>   * Update and merge documentation patch
>   * Update MAINTAINERS]
> Signed-off-by: Ralph Sennhauser <ralph.sennhauser@...il.com>
> Tested-by: Andrew Lunn <andrew@...n.ch>
> Acked-by: Thierry Reding <thierry.reding@...il.com>
> Acked-by: Rob Herring <robh@...nel.org>

Patch applied.

Yours,
Linus Walleij