linux-kernel - Re: [PATCH 4/4] leds: flash: mt6360: Add mt6360 isnk channel hardwre breath mode support

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Message-ID: <CADiBU39sgh-6=KmXgbuhNmL4QAQhdHpPz5nEDwffev8x+MQKpA@mail.gmail.com>
Date:   Thu, 28 Apr 2022 22:57:01 +0800
From:   ChiYuan Huang <u0084500@...il.com>
To:     Matti Vaittinen <mazziesaccount@...il.com>
Cc:     Pavel Machek <pavel@....cz>,
        Matthias Brugger <matthias.bgg@...il.com>,
        ChiYuan Huang <cy_huang@...htek.com>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Gene Chen <gene_chen@...htek.com>,
        Linux LED Subsystem <linux-leds@...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>
Subject: Re: [PATCH 4/4] leds: flash: mt6360: Add mt6360 isnk channel hardwre
 breath mode support

Matti Vaittinen <mazziesaccount@...il.com> 於 2022年4月28日 週四 下午7:51寫道：
>
> Hi ChiYuan!
>
> On Thu, Apr 28, 2022 at 1:03 PM cy_huang <u0084500@...il.com> wrote:
> > From: ChiYuan Huang <cy_huang@...htek.com>
> >
> > Add mt6360 isnk channel hardware breath mode support.
> >
> > Signed-off-by: ChiYuan Huang <cy_huang@...htek.com>
> >
> > +static int mt6360_gen_breath_reg_config(struct led_pattern *pattern, u32 len,
> > +                                       u8 *vals, int val_len)
> > +{
> > +       static const struct linear_range tranges[MT6360_ILED_RANGE_MAX] = {
> > +               { 125, 0, 15, 250 }, /* tr/f12 and ton, unit: millisecond */
> > +               { 250, 0, 15, 500 }, /* toff, unit: millisecond */
> > +       };
>
> It's nice to see you are using the linear_ranges helpers here! Just a
> minor remark - do you think you could use field names in linear_ranges
> initializations? That would make it less likely the driver breaks if
> someone changes the struct linear_range definition. Eg, use something
> like:
>
> static const struct linear_range tranges[MT6360_ILED_RANGE_MAX] = {
>         /* tr/f12 and ton, unit: millisecond */
>         { .min = 125, .min_sel = 0, .max_sel = 15, .step = 250 },
>         /* toff, unit: millisecond */
>         { .min = 250, .min_sel = 0, .max_sel = 15, .step = 500 },
> };
>
> Do you think that would work?
Sure, it works.
To specify the field name can be compatible if the struct changes in the future.
Thanks.
>
> Best Regards
> -- Matti
>
> --
>
> Matti Vaittinen
> Linux kernel developer at ROHM Semiconductors
> Oulu Finland
>
> ~~ When things go utterly wrong vim users can always type :help! ~~
>
> Discuss - Estimate - Plan - Report and finally accomplish this:
> void do_work(int time) __attribute__ ((const));