linux-kernel - Re: [PATCH v6 11/12] mfd: bd9571mwv: Make the driver more generic

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Date:   Thu, 24 Dec 2020 07:34:26 +0000
From:   Lee Jones <lee.jones@...aro.org>
To:     Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
Cc:     "marek.vasut+renesas@...il.com" <marek.vasut+renesas@...il.com>,
        "matti.vaittinen@...rohmeurope.com" 
        <matti.vaittinen@...rohmeurope.com>,
        "lgirdwood@...il.com" <lgirdwood@...il.com>,
        "broonie@...nel.org" <broonie@...nel.org>,
        "linus.walleij@...aro.org" <linus.walleij@...aro.org>,
        "bgolaszewski@...libre.com" <bgolaszewski@...libre.com>,
        Khiem Nguyen <khiem.nguyen.xt@...esas.com>,
        "linux-power@...rohmeurope.com" <linux-power@...rohmeurope.com>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "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 v6 11/12] mfd: bd9571mwv: Make the driver more generic

On Thu, 24 Dec 2020, Yoshihiro Shimoda wrote:

> Hi Lee,
> 
> > From: Lee Jones, Sent: Thursday, December 24, 2020 12:39 AM
> > On Wed, 23 Dec 2020, Yoshihiro Shimoda wrote:
> > > From: Khiem Nguyen <khiem.nguyen.xt@...esas.com>
> > >
> > > Since the driver supports BD9571MWV PMIC only, this patch makes
> > > the functions and data structure become more generic so that
> > > it can support other PMIC variants as well. Also remove printing
> > > part name which Lee Jones suggested.
> > >
> > > Signed-off-by: Khiem Nguyen <khiem.nguyen.xt@...esas.com>
> > > Co-developed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
> > > Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
> > > Reviewed-by: Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
> > > ---
> > >  drivers/mfd/bd9571mwv.c       | 89 +++++++++++++++++++++++++------------------
> > >  include/linux/mfd/bd9571mwv.h | 18 +--------
> > >  2 files changed, 54 insertions(+), 53 deletions(-)
> > 
> > Couple of small points.
> > 
> > Remainder looks good.
> 
> Thank you for your review!
> 
> > > diff --git a/drivers/mfd/bd9571mwv.c b/drivers/mfd/bd9571mwv.c
> > > index 49e968e..c905ab4 100644
> > > --- a/drivers/mfd/bd9571mwv.c
> > > +++ b/drivers/mfd/bd9571mwv.c
> > > @@ -3,6 +3,7 @@
> > >   * ROHM BD9571MWV-M MFD driver
> > >   *
> > >   * Copyright (C) 2017 Marek Vasut <marek.vasut+renesas@...il.com>
> > > + * Copyright (C) 2020 Renesas Electronics Corporation
> > >   *
> > >   * Based on the TPS65086 driver
> > >   */
> > > @@ -14,6 +15,14 @@
> > >
> > >  #include <linux/mfd/bd9571mwv.h>
> > >
> > > +/* Driver data to distinguish bd957x variants */
> > > +struct bd957x_ddata {
> > > +	const struct regmap_config *regmap_config;
> > > +	const struct regmap_irq_chip *irq_chip;
> > 
> > > +	const struct mfd_cell *cells;
> > > +	int num_cells;
> > 
> > Are you using these post-probe?
> > 
> > If not, they're not ddata.
> 
> I'm not using all these members post-probe.
> So, I'll remove ddata.
> 
> <snip>
> > >  static int bd9571mwv_probe(struct i2c_client *client,
> > > -			  const struct i2c_device_id *ids)
> > > +			   const struct i2c_device_id *ids)
> > >  {
> > > -	struct bd9571mwv *bd;
> > > -	int ret;
> > > -
> > > -	bd = devm_kzalloc(&client->dev, sizeof(*bd), GFP_KERNEL);
> > > -	if (!bd)
> > > -		return -ENOMEM;
> > > -
> > > -	i2c_set_clientdata(client, bd);
> > > -	bd->dev = &client->dev;
> > > -	bd->irq = client->irq;
> > > +	const struct bd957x_ddata *ddata;
> > > +	struct device *dev = &client->dev;
> > > +	struct regmap *regmap;
> > > +	struct regmap_irq_chip_data *irq_data;
> > > +	int ret, irq = client->irq;
> > > +
> > > +	/* Read the PMIC product code */
> > > +	ret = i2c_smbus_read_byte_data(client, BD9571MWV_PRODUCT_CODE);
> > > +	if (ret < 0) {
> > > +		dev_err(dev, "Failed to read product code\n");
> > > +		return ret;
> > > +	}
> > 
> > Nit: '\n' here.
> 
> I got it. I'll add a blank line here.
> 
> > > +	switch (ret) {
> > > +	case BD9571MWV_PRODUCT_CODE_BD9571MWV:
> > > +		ddata = &bd9571mwv_ddata;
> > 
> > Simply declare 'const struct mfd_cell *cells' locally in probe and
> > assign it here instead.
> 
> I got it. I'll also add "const struct regmap_config *regmap_config;"
> and "const struct regmap_irq_chip *irq_chip;" locally in probe.

If you only use them there, then yes, that's correct.

-- 
Lee Jones [李琼斯]
Senior Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
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