linux-kernel - Re: [PATCH v2 04/10] regulator: bd9571mwv: Add BD9574MWF support

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Date:   Fri, 11 Dec 2020 12:34:27 +0000
From:   "Vaittinen, Matti" <Matti.Vaittinen@...rohmeurope.com>
To:     "lgirdwood@...il.com" <lgirdwood@...il.com>,
        "marek.vasut+renesas@...il.com" <marek.vasut+renesas@...il.com>,
        "yoshihiro.shimoda.uh@...esas.com" <yoshihiro.shimoda.uh@...esas.com>,
        "broonie@...nel.org" <broonie@...nel.org>,
        "bgolaszewski@...libre.com" <bgolaszewski@...libre.com>,
        "lee.jones@...aro.org" <lee.jones@...aro.org>,
        "linus.walleij@...aro.org" <linus.walleij@...aro.org>
CC:     linux-power <linux-power@...rohmeurope.com>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "khiem.nguyen.xt@...esas.com" <khiem.nguyen.xt@...esas.com>,
        "linux-renesas-soc@...r.kernel.org" 
        <linux-renesas-soc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 04/10] regulator: bd9571mwv: Add BD9574MWF support

Hello again Shimada-san,

On Fri, 2020-12-11 at 20:27 +0900, Yoshihiro Shimoda wrote:
> Add support for BD9574MWF which is silimar chip with BD9571MWV.
> Note that BD9574MWF doesn't support AVS and VID.

I'd like to understand what is VID?

> 
> Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
> ---
>  drivers/regulator/bd9571mwv-regulator.c | 10 ++++++++--
>  1 file changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/regulator/bd9571mwv-regulator.c
> b/drivers/regulator/bd9571mwv-regulator.c
> index 02120b0..041339b 100644
> --- a/drivers/regulator/bd9571mwv-regulator.c
> +++ b/drivers/regulator/bd9571mwv-regulator.c
> @@ -1,6 +1,6 @@
>  // SPDX-License-Identifier: GPL-2.0
>  /*
> - * ROHM BD9571MWV-M regulator driver
> + * ROHM BD9571MWV-M and BD9574MWF-M regulator driver
>   *
>   * Copyright (C) 2017 Marek Vasut <marek.vasut+renesas@...il.com>
>   *
> @@ -9,6 +9,7 @@
>   * NOTE: VD09 is missing
>   */
>  
> +#include <linux/mfd/rohm-generic.h>
>  #include <linux/module.h>
>  #include <linux/of.h>
>  #include <linux/platform_device.h>
> @@ -277,6 +278,7 @@ static int bd9571mwv_regulator_probe(struct
> platform_device *pdev)
>  	struct regulator_dev *rdev;
>  	unsigned int val;
>  	int i;
> +	enum rohm_chip_type chip = platform_get_device_id(pdev)-
> >driver_data;
>  
>  	bdreg = devm_kzalloc(&pdev->dev, sizeof(*bdreg), GFP_KERNEL);
>  	if (!bdreg)
> @@ -292,6 +294,9 @@ static int bd9571mwv_regulator_probe(struct
> platform_device *pdev)
>  	config.regmap = bdreg->regmap;
>  
>  	for (i = 0; i < ARRAY_SIZE(regulators); i++) {
> +		/* BD9574MWF supports DVFS only */
> +		if (chip == ROHM_CHIP_TYPE_BD9574 && regulators[i].id
> != DVFS)
> +			continue;

Does this mean that reading VD09 voltage is not supported by driver? (I
assumed VD09 initial voltage can be set from eeprom(?) and read by
driver - I may be wrong though). Perhaps it is worth mentioning in the
commit message as a driver restriction?

And just asking out of the curiosity - are the other voltage rails
listed in data-sheet (VD18, DDR0, VD33, VD09 and LDO1,...,LDO4) set-up
from DT as fixed-regulators? Any reason why they are not set-up here?

>  		rdev = devm_regulator_register(&pdev->dev,
> &regulators[i],
>  					       &config);
>  		if (IS_ERR(rdev)) {
> @@ -339,7 +344,8 @@ static int bd9571mwv_regulator_probe(struct
> platform_device *pdev)
>  }
>  
>  static const struct platform_device_id
> bd9571mwv_regulator_id_table[] = {
> -	{ "bd9571mwv-regulator", },
> +	{ "bd9571mwv-regulator", ROHM_CHIP_TYPE_BD9571 },
> +	{ "bd9574mwf-regulator", ROHM_CHIP_TYPE_BD9574 },
>  	{ /* sentinel */ }
>  };
>  MODULE_DEVICE_TABLE(platform, bd9571mwv_regulator_id_table);