linux-kernel - Re: [PATCH v3 4/6] mfd: Add RTL8231 core device

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Date:   Mon, 24 May 2021 11:02:19 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Sander Vanheule <sander@...nheule.net>
Cc:     Pavel Machek <pavel@....cz>, Rob Herring <robh+dt@...nel.org>,
        Lee Jones <lee.jones@...aro.org>,
        Mark Brown <broonie@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Michael Walle <michael@...le.cc>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Linux LED Subsystem <linux-leds@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Andrew Lunn <andrew@...n.ch>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        kernel test robot <lkp@...el.com>
Subject: Re: [PATCH v3 4/6] mfd: Add RTL8231 core device

On Mon, May 24, 2021 at 1:34 AM Sander Vanheule <sander@...nheule.net> wrote:
>
> The RTL8231 is implemented as an MDIO device, and provides a regmap
> interface for register access by the core and child devices.
>
> The chip can also be a device on an SMI bus, an I2C-like bus by Realtek.
> Since kernel support for SMI is limited, and no real-world SMI
> implementations have been encountered for this device, this is currently
> unimplemented. The use of the regmap interface should make any future
> support relatively straightforward.
>
> After reset, all pins are muxed to GPIO inputs before the pin drivers
> are enabled. This is done to prevent accidental system resets, when a
> pin is connected to the parent SoC's reset line.

...

> [missing MDIO_BUS dependency, provided via REGMAP_MDIO]
> Reported-by: kernel test robot <lkp@...el.com>

What does this fix? Shouldn't it have a Fixes tag? (Yes, I know that
you answered in the other email, but here is a hint: before settling
these kinds of things do not send a new version. Instead of speeding
up the review you are closer to the chance to have this been not
applied for v5.14 at all)

...

> +       /* SOFT_RESET bit self-clears when done */
> +       regmap_update_bits(map, RTL8231_REG_PIN_HI_CFG,
> +               RTL8231_PIN_HI_CFG_SOFT_RESET, RTL8231_PIN_HI_CFG_SOFT_RESET);

> +       usleep_range(1000, 10000);

It's strange to see this big range of minimum and maximum sleep.
Usually the ratio should not be bigger than ~3-4 between the values.

...

> +       regmap_write(map, RTL8231_REG_PIN_MODE0, 0xffff);
> +       regmap_write(map, RTL8231_REG_GPIO_DIR0, 0xffff);
> +       regmap_write(map, RTL8231_REG_PIN_MODE1, 0xffff);
> +       regmap_write(map, RTL8231_REG_GPIO_DIR1, 0xffff);

GENMASK() ?
Actually it seems it deserves a special definition like

..._ALL_PIN_MASK  GENMASK(15, 0)

-- 
With Best Regards,
Andy Shevchenko