linux-kernel - Re: [PATCH v3 06/10] mfd: da9063: Add custom regmap for DA9063L

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Date:   Mon, 4 Jun 2018 09:39:49 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Marek Vasut <marek.vasut@...il.com>,
        Steve Twiss <stwiss.opensource@...semi.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Marek Vasut <marek.vasut+renesas@...il.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Lee Jones <lee.jones@...aro.org>,
        Mark Brown <broonie@...nel.org>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>
Subject: Re: [PATCH v3 06/10] mfd: da9063: Add custom regmap for DA9063L

Hi Marek, Steve,

On Sat, Jun 2, 2018 at 12:11 PM, Marek Vasut <marek.vasut@...il.com> wrote:
> While the datasheet for DA9063L (2v1, 23-Mar-2017) lists the RTC register
> block, the DA9063L does not have an RTC. Add custom regmap for DA9063L to
> prevent access into that register block.
>
> Signed-off-by: Marek Vasut <marek.vasut+renesas@...il.com>

Thanks for your patch!

> --- a/drivers/mfd/da9063-i2c.c
> +++ b/drivers/mfd/da9063-i2c.c
> @@ -254,6 +341,10 @@ static int da9063_i2c_probe(struct i2c_client *i2c,

Note that the line above doesn't check da9063->type, but da9063->variant_code...

>                 da9063_regmap_config.rd_table = &da9063_ad_readable_table;
>                 da9063_regmap_config.wr_table = &da9063_ad_writeable_table;
>                 da9063_regmap_config.volatile_table = &da9063_ad_volatile_table;
> +       } else if (da9063->type == PMIC_TYPE_DA9063L) {

... so this may be slightly confusing.

> +               da9063_regmap_config.rd_table = &da9063l_bb_readable_table;
> +               da9063_regmap_config.wr_table = &da9063l_bb_writeable_table;
> +               da9063_regmap_config.volatile_table = &da9063l_bb_volatile_table;
>         } else {
>                 da9063_regmap_config.rd_table = &da9063_bb_readable_table;
>                 da9063_regmap_config.wr_table = &da9063_bb_writeable_table;

However, da9063->variant_code doesn't seem to have been filled in at this
point yet (the call to da9063_device_init() doing so is below, at the end
of the probe function!), so commit 9cb42e2a8ed06e91 ("mfd: da9063: Add
support for AD silicon variant") never actually handled the AD silicon variant
correctly? Or am I missing something?

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds