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

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Date:   Thu, 2 Jun 2022 14:26:51 +0800
From:   ChiYuan Huang <u0084500@...il.com>
To:     Andy Shevchenko <andy.shevchenko@...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, u0084500@...il.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 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:
> >
> > From: Alice Chen <alice_chen@...htek.com>
> 
> All below comments are applicable to the rest of the series as well
> (one way or another), so please fix all your patches where it's
> appropriate.
> 
> >
> > Add Mediatek MT6370 Indicator support
> 
> What indicator?
It's RGB curent sink type LED driver (maximum supported current is only 24mA).
> Please also keep attention on English punctuation (missed period).
> 
Ack in next.
> ...
>
> > +       help
> > +         Support 4 channels and reg/pwm/breath mode.
> > +         Isink4 can also use as a CHG_VIN power good Indicator.
> 
> be used
> 
Ack in next.
> > +         Say Y here to enable support for
> > +         MT6370_RGB_LED device.
> 
> ...
> 
> > +#include <linux/module.h>
> > +#include <linux/mutex.h>
> > +#include <linux/platform_device.h>
> 
> > +#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'.
> > +#include <linux/property.h>
> > +#include <linux/regmap.h>
> 
> ...
> 
> > +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?
> > +       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[];
> > +};
> 
> ...
> 
> > +static const unsigned int common_tfreqs[] = {
> > +       10000, 5000, 2000, 1000, 500, 200, 5, 1
> 
> Leave a comma at the end.
> 
Ack in next.
> > +};
> > +
> > +static const unsigned int mt6372_tfreqs[] = {
> > +       8000, 4000, 2000, 1000, 500, 250, 8, 4
> 
> Ditto.
> 
Ack in next.
> > +};
> 
> 
> -- 
> With Best Regards,
> Andy Shevchenko