linux-kernel - Re: [PATCH 07/14] leds: flashlight: mt6370: Add Mediatek MT6370 flashlight support

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Message-ID: <CAHp75Vf=ATRfaaaGFuuPHuQj6wTjnRPBw4W5WYfgYuUP-A-L=g@mail.gmail.com>
Date:   Thu, 2 Jun 2022 15:57:19 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     szuni chen <szunichen@...il.com>
Cc:     ChiaEn Wu <peterwu.pub@...il.com>,
        Lee Jones <lee.jones@...aro.org>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Jingoo Han <jingoohan1@...il.com>, Pavel Machek <pavel@....cz>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Sebastian Reichel <sre@...nel.org>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Guenter Roeck <linux@...ck-us.net>,
        "Krogerus, Heikki" <heikki.krogerus@...ux.intel.com>,
        Helge Deller <deller@....de>, cy_huang@...htek.com,
        alice_chen@...htek.com, chiaen_wu@...htek.com,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Linux LED Subsystem <linux-leds@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        USB <linux-usb@...r.kernel.org>,
        linux-iio <linux-iio@...r.kernel.org>,
        "open list:FRAMEBUFFER LAYER" <linux-fbdev@...r.kernel.org>
Subject: Re: [PATCH 07/14] leds: flashlight: mt6370: Add Mediatek MT6370
 flashlight support

On Thu, Jun 2, 2022 at 2:07 PM szuni chen <szunichen@...il.com> wrote:
> Andy Shevchenko <andy.shevchenko@...il.com> 於 2022年6月1日 週三 下午5:57寫道：
> > On Tue, May 31, 2022 at 1:32 PM ChiaEn Wu <peterwu.pub@...il.com> wrote:

...

> > > +       const char * const states[] = { "off", "keep", "on" };
> > > +       const char *str;
> > > +       int ret;
> > > +
> > > +       if (!fwnode_property_read_string(init_data->fwnode,
> > > +                                        "default-state", &str)) {
> > > +               ret = match_string(states, ARRAY_SIZE(states), str);
> > > +               if (ret < 0)
> > > +                       ret = STATE_OFF;
> > > +
> > > +               led->default_state = ret;
> > > +       }
> >
> > fwnode_property_match_string()?
> Sorry, but I think the use of this function is different from my target.
> I want to read the string of the "default-state" property and figure
> out if the string is in the states array.
> But the fwnode_property_match_string aimed to figure out if the state
> in the property array.
> One is a property array and another one is a state array.

Ah, indeed. Nevertheless you may reduce the code base by doing like
the following (I wonder what your code do if there is no default-state
property):

  led->default_state = STATE_OFF; // it's by default off since
kzalloc(), so I don't see why we need this line at all.

  fwnode_property_read_string(init_data->fwnode, "default-state", &str);
  ret = match_string(states, ARRAY_SIZE(states), str);
  if (ret >= 0)
    led->default_state = ret;


-- 
With Best Regards,
Andy Shevchenko