Re: [PATCH v6 2/2] media: i2c: Add GC08A3 image sensor driver

["Zhi Mao (毛智)" <zhi.mao@mediatek.com>]

Hi Andy,

Thanks for your review.


On Tue, 2024-02-27 at 14:46 +0200, Andy Shevchenko wrote:
>  	 
> External email : Please do not click links or open attachments until
> you have verified the sender or the content.
>  On Tue, Feb 27, 2024 at 3:33 AM Zhi Mao <zhi.mao@mediatek.com>
> wrote:
> >
> > Add a V4L2 sub-device driver for Galaxycore GC08A3 image sensor.
> 
> ...
> 
> > +/*
> > + * gc08a3.c - gc08a3 sensor driver
> 
> Drop the filename from the file, it's impractical (esp. if the file
> will be renamed for some reason in the future).
> 
fixed in patch:v7.

> > + *
> > + * Copyright 2023 MediaTek
> > + *
> > + * Zhi Mao <zhi.mao@mediatek.com>
> > + */
> 
> ...
> 
> > +#include <linux/clk.h>
> > +#include <linux/delay.h>
> > +#include <linux/gpio/consumer.h>
> > +#include <linux/pm_runtime.h>
> > +#include <linux/regulator/consumer.h>
> > +#include <linux/units.h>
> 
> This is a semi-random list of inclusions. Please, follow the IWYU
> (Include What You Use) principle. *At least* this list misses the
> following:  array_size.h, bits.h, container_of.h, device.h, err.h,
> i2c.h, math64.h, module.h, mod_devicetable.h, property.h, types.h.
> 
fixed in patch:v7.

> ...
> 
> > +       /*update crop info to subdev state*/
> 
> Missing spaces.
> 
fixed in patch:v7.

> ...
> 
> > +       /*update fmt info to subdev state*/
> 
> Ditto.
> 
fixed in patch:v7.

> ...
> 
> > +static int gc08a3_test_pattern(struct gc08a3 *gc08a3, u32
> pattern_menu)
> > +{
> > +       u32 pattern = 0;
> 
> No, please use the default case for this assignment.
> 
fixed in patch:v7.

> > +       int ret;
> > +
> > +       if (pattern_menu) {
> > +               switch (pattern_menu) {
> > +               case 1:
> > +                       pattern = 0x00;
> > +                       break;
> > +               case 2:
> > +                       pattern = 0x10;
> > +                       break;
> > +               case 3:
> > +               case 4:
> > +               case 5:
> > +               case 6:
> > +               case 7:
> > +                       pattern = pattern_menu + 1;
> > +                       break;
> > +               }
> > +
> > +               ret = cci_write(gc08a3->regmap,
> GC08A3_REG_TEST_PATTERN_IDX,
> > +                               pattern, NULL);
> > +               if (ret)
> > +                       return ret;
> > +
> 
> > +               ret = cci_write(gc08a3->regmap,
> GC08A3_REG_TEST_PATTERN_EN,
> > +                               GC08A3_TEST_PATTERN_EN, NULL);
> > +               if (ret)
> > +                       return ret;
> > +       } else {
> > +               ret = cci_write(gc08a3->regmap,
> GC08A3_REG_TEST_PATTERN_EN,
> > +                               0x00, NULL);
> > +               if (ret)
> > +                       return ret;
> > +       }
> > +
> > +       return 0;
> 
> 'else' is redundant, but you can deduplicate code above with
> 
>   return cci_write(...);
> } else {
>   return cci_write(...);
> }
> 
> Of course you can go even further, but I think with the above it will
> be balanced to the way that it's easy to understand how branches
> behave ('else' in this case helps to indent semantically coupled
> lines).
> 
fixed in patch:v7.

> > +}
> 
> 
> > +       /*
> > +        * Applying V4L2 control value only happens
> > +        * when power is on for streaming
> > +        */
> 
> Respect English grammar and punctuation, i.e. don't forget periods at
> the end of sentences in multi-line comments.
> 
fixed in patch:v7.

> ...
> 
> > +       endpoint =
> > +               fwnode_graph_get_endpoint_by_id(dev_fwnode(dev), 0,
> 0,
> >
> +                                               FWNODE_GRAPH_ENDPOINT
> _NEXT);
> > +       if (!endpoint) {
> 
> Strictly speaking dev_fwnode(dev) might be NULL or an error pointer.
> I
> dunno how the graph is implemented there and if it's possible to get
> an error pointer out of it. At least this probably needs to be
> aligned
> there at some point.
> 
Mr.Sakari has explained this comments.
"This is fine---the fwnode API returns errors (for functions that can)
for NULL or error pointer fwnodes."

> > +               dev_err(dev, "endpoint node not found\n");
> > +               return -EINVAL;
> > +       }
> 
> ...
> 
> > +static const struct dev_pm_ops gc08a3_pm_ops = {
> > +       RUNTIME_PM_OPS(gc08a3_power_off, gc08a3_power_on, NULL)
> > +};
> 
> There is a DEFINE_* PM macro, use it.
> 
fixed in patch:v7.

> ...
> 
> > +
> 
> Redundant blank line.
> 
fixed in patch:v7.

> > +module_i2c_driver(gc08a3_i2c_driver);
> 
> -- 
> With Best Regards,
> Andy Shevchenko
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