linux-kernel - Re: [RFC PATCH v1 05/13] mfd: bd70528: Support ROHM bd70528 PMIC

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Message-ID: <20190122162051.GA2559@localhost.localdomain>
Date:   Tue, 22 Jan 2019 18:20:51 +0200
From:   Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     mazziesaccount@...il.com, lee.jones@...aro.org, robh+dt@...nel.org,
        mark.rutland@....com, lgirdwood@...il.com, broonie@...nel.org,
        gregkh@...uxfoundation.org, rafael@...nel.org,
        mturquette@...libre.com, sboyd@...nel.org,
        linus.walleij@...aro.org, bgolaszewski@...libre.com,
        sre@...nel.org, a.zummo@...ertech.it,
        alexandre.belloni@...tlin.com, wim@...ux-watchdog.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-pm@...r.kernel.org, linux-rtc@...r.kernel.org,
        linux-watchdog@...r.kernel.org, mikko.mutanen@...rohmeurope.com,
        heikki.haikola@...rohmeurope.com
Subject: Re: [RFC PATCH v1 05/13] mfd: bd70528: Support ROHM bd70528 PMIC -
 core

Hello Guenter,

Thanks for taking the time and doing review!

On Tue, Jan 22, 2019 at 06:51:26AM -0800, Guenter Roeck wrote:
> On 1/22/19 1:44 AM, Matti Vaittinen wrote:
> > +static DEFINE_MUTEX(rtc_timer_mutex);

// snip

> > +static int bd70528_i2c_probe(struct i2c_client *i2c,
> > +			    const struct i2c_device_id *id)
> > +{
> > +	struct bd70528 *bd70528;
> > +	struct regmap_irq_chip_data *irq_data;
> > +	int ret, i;
> > +
> > +	if (!i2c->irq) {
> > +		dev_err(&i2c->dev, "No IRQ configured\n");
> > +		return -EINVAL;
> > +	}
> > +	bd70528 = devm_kzalloc(&i2c->dev, sizeof(*bd70528), GFP_KERNEL);
> > +
> > +	if (!bd70528)
> > +		return -ENOMEM;
> > +
> > +	dev_set_drvdata(&i2c->dev, bd70528);
> > +	bd70528->rtc_timer_lock = &rtc_timer_mutex;
> 
> One global mutex for all instances of this driver is odd.
> Why isn't this just part of struct bd70528 ?
> 

You are right. This was a brainfart from my side. I don't think there
is many cases where this would har though. I don't expect to see
many instances of PMIC drivers load. But you are correct nevertheless.
I will fix this in future version. Thanks for pointing it out!

Br,
	Matti Vaittinen


-- 
Matti Vaittinen
ROHM Semiconductors

~~~ "I don't think so," said Rene Descartes.  Just then, he vanished ~~~