linux-kernel - Re: [PATCH 3/3] mfd: bd9571mwv: Add support for BD9574MWF

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Date:   Wed, 9 Dec 2020 14:30:18 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
Cc:     Marek Vasut <marek.vasut+renesas@...il.com>,
        Lee Jones <lee.jones@...aro.org>,
        Khiem Nguyen <khiem.nguyen.xt@...esas.com>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
Subject: Re: [PATCH 3/3] mfd: bd9571mwv: Add support for BD9574MWF

Hi Shimoda-san,

CC Matti (BD9573/6 driver for R-Car platforms)

(I don't have the BD9574 datasheet, so I have to base my review on
 https://www.rohm.com/r-car-pmic)

On Tue, Dec 8, 2020 at 9:06 AM Yoshihiro Shimoda
<yoshihiro.shimoda.uh@...esas.com> wrote:
> From: Khiem Nguyen <khiem.nguyen.xt@...esas.com>
>
> The new PMIC BD9574MWF inherits features from BD9571MWV.
> Add the support of new PMIC to existing bd9571mwv driver.
>
> Signed-off-by: Khiem Nguyen <khiem.nguyen.xt@...esas.com>
> [shimoda: rebase and refactor]
> Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>

Thanks for your patch!

> --- a/drivers/mfd/bd9571mwv.c
> +++ b/drivers/mfd/bd9571mwv.c
> @@ -20,6 +20,7 @@ static const struct mfd_cell bd9571mwv_cells[] = {
>         { .name = "bd9571mwv-gpio", },
>  };
>
> +/* Regmap for BD9571MWV */

Note that bd9571mwv_cells[] above also applies to BD9571MWV.

>  static const struct regmap_range bd9571mwv_readable_yes_ranges[] = {
>         regmap_reg_range(BD9571MWV_VENDOR_CODE, BD9571MWV_PRODUCT_REVISION),
>         regmap_reg_range(BD9571MWV_BKUP_MODE_CNT, BD9571MWV_BKUP_MODE_CNT),
> @@ -112,6 +113,95 @@ static const struct bd957x_data bd9571mwv_data = {
>         .num_cells = ARRAY_SIZE(bd9571mwv_cells),
>  };
>
> +static const struct mfd_cell bd9574mwf_cells[] = {
> +       { .name = "bd9571mwv-gpio", },

No regulator cell?

> +};
> +
> +/* Regmap for BD9574MWF */

Note that bd9574mwf_cells[] above also applies to BD9574MWF.
Perhaps the comments should be changed slightly, and moved up,
to serve as a separator between chip variants?

> +static const struct regmap_range bd9574mwf_readable_yes_ranges[] = {
> +       regmap_reg_range(BD9574MWF_VENDOR_CODE, BD9574MWF_PRODUCT_REVISION),

Missing BD9574MWF_BKUP_MODE_CNT and BD9574MWF_DVFS_*?

> +       regmap_reg_range(BD9574MWF_GPIO_IN, BD9574MWF_GPIO_IN),
> +       regmap_reg_range(BD9574MWF_GPIO_INT, BD9574MWF_GPIO_INTMASK),
> +       regmap_reg_range(BD9574MWF_GPIO_MUX, BD9574MWF_GPIO_MUX),
> +       regmap_reg_range(BD9574MWF_INT_INTREQ, BD9574MWF_INT_INTMASK),
> +};
> +
> +static const struct regmap_access_table bd9574mwf_readable_table = {
> +       .yes_ranges     = bd9574mwf_readable_yes_ranges,
> +       .n_yes_ranges   = ARRAY_SIZE(bd9574mwf_readable_yes_ranges),
> +};
> +
> +static const struct regmap_range bd9574mwf_writable_yes_ranges[] = {

Missing BD9574MWF_BKUP_MODE_CNT and BD9574MWF_DVFS_*?

> +       regmap_reg_range(BD9574MWF_GPIO_DIR, BD9574MWF_GPIO_OUT),
> +       regmap_reg_range(BD9574MWF_GPIO_INT_SET, BD9574MWF_GPIO_INTMASK),
> +       regmap_reg_range(BD9574MWF_INT_INTREQ, BD9574MWF_INT_INTMASK),
> +};

> @@ -182,6 +272,8 @@ static int bd9571mwv_probe(struct i2c_client *client,
>         product_code = (unsigned int)ret;
>         if (product_code == BD9571MWV_PRODUCT_CODE_VAL)
>                 bd->data = &bd9571mwv_data;
> +       else if (product_code == BD9574MWF_PRODUCT_CODE_VAL)
> +               bd->data = &bd9574mwf_data;
>
>         if (!bd->data) {
>                 dev_err(bd->dev, "No found supported device %d\n",

While BD9571MWV and BD9574MWF can be distinguished at runtime,
I think it would still be a good idea to document a "rohm,bd9574mwf"
compatible value in the DT bindings, and let the driver match on that.

> diff --git a/include/linux/mfd/bd9571mwv.h b/include/linux/mfd/bd9571mwv.h
> index 0126b52..e9e219b 100644
> --- a/include/linux/mfd/bd9571mwv.h
> +++ b/include/linux/mfd/bd9571mwv.h

> +#define BD9574MWF_VDCORE_VINIT                 0x50
> +#define BD9574MWF_VD09_VINIT                   0x51
> +#define BD9574MWF_VDCORE_SETVMAX               0x52
> +#define BD9574MWF_VDCORE_SETVID                        0x54
> +#define BD9574MWF_VDCORE_MONIVDAC              0x55
> +#define BD9574MWF_VDCORE_PGD_CNT               0x56

Some of the above are the same as the corresponding BD9571MWV
registers, so using the same define may simplify regulator support
(cfr. BD9571MWV_DVFS_SETVID and BD9571MWV_DVFS_MONIVDAC).

> +#define BD9574MWF_PART_NUMBER                  "BD9574MWF"

BD9574MWF_PART_NAME?

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