linux-kernel - Re: [PATCH 06/14] leds: mt6370: Add Mediatek MT6370 Indicator support

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Date:   Thu, 2 Jun 2022 11:17:40 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     ChiYuan Huang <u0084500@...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 06/14] leds: mt6370: Add Mediatek MT6370 Indicator support

On Thu, Jun 2, 2022 at 8:27 AM ChiYuan Huang <u0084500@...il.com> wrote:
> On Wed, Jun 01, 2022 at 11:48:58AM +0200, Andy Shevchenko wrote:
> > On Tue, May 31, 2022 at 1:16 PM ChiaEn Wu <peterwu.pub@...il.com> wrote:

...

> > What indicator?
> It's RGB curent sink type LED driver (maximum supported current is only 24mA).

Make your commit messages a slightly more verbose.

...

> > > +#include <linux/of.h>
> >
> > Are you sure this is the correct header? Seems you need
> > mod_devicetable.h instead.
> >
> It's the correct header and be used for the struct 'of_device_id'.

Nope. Run the following command
$ git grep -n 'struct of_device_id {' -- include/linux/

...

> > > +struct mt6370_priv {
> > > +       struct mutex lock;
> >
> > Do you use regmap locking?
> >
> MFD regmap register already the access lock.
>
> This lock is just to guarantee only one user can access the RGB register
> part.
>
> Sorry, from the comment, do you want us to rename or remove this lock?

My point is, since you have two locks, explain why you need each of them.

> > > +       struct device *dev;
> >
> > > +       struct regmap *regmap;
> >
> > > +       struct regmap_field *fields[F_MAX_FIELDS];
> > > +       const struct reg_field *reg_fields;
> > > +       const struct linear_range *ranges;
> > > +       struct reg_cfg *reg_cfgs;
> > > +       unsigned int leds_count;
> > > +       unsigned int leds_active;
> > > +       bool is_mt6372;
> > > +       struct mt6370_led leds[];
> > > +};


-- 
With Best Regards,
Andy Shevchenko