linux-kernel - Re: [PATCH V15 6/9] mfd: pm8008: Use i2c_new_dummy

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Message-ID: <YrAt6dq6ty9p8d05@google.com>
Date:   Mon, 20 Jun 2022 09:20:57 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     "Satya Priya Kakitapalli (Temp)" <quic_c_skakit@...cinc.com>
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        swboyd@...omium.org, quic_collinsd@...cinc.com,
        quic_subbaram@...cinc.com, quic_jprakash@...cinc.com
Subject: Re: [PATCH V15 6/9] mfd: pm8008: Use i2c_new_dummy_device() API

On Mon, 20 Jun 2022, Satya Priya Kakitapalli (Temp) wrote:

> 
> On 6/17/2022 2:27 AM, Lee Jones wrote:
> > On Tue, 14 Jun 2022, Satya Priya wrote:
> > 
> > > Use i2c_new_dummy_device() to register pm8008-regulator
> > > client present at a different address space, instead of
> > > defining a separate DT node. This avoids calling the probe
> > > twice for the same chip, once for each client pm8008-infra
> > > and pm8008-regulator.
> > > 
> > > As a part of this define pm8008_regmap_init() to do regmap
> > > init for both the clients and define pm8008_get_regmap() to
> > > pass the regmap to the regulator driver.
> > > 
> > > Signed-off-by: Satya Priya <quic_c_skakit@...cinc.com>
> > > Reviewed-by: Stephen Boyd <swboyd@...omium.org>
> > > ---
> > > Changes in V15:
> > >   - None.
> > > 
> > > Changes in V14:
> > >   - None.
> > > 
> > > Changes in V13:
> > >   - None.
> > > 
> > >   drivers/mfd/qcom-pm8008.c       | 34 ++++++++++++++++++++++++++++++++--
> > >   include/linux/mfd/qcom_pm8008.h |  9 +++++++++
> > >   2 files changed, 41 insertions(+), 2 deletions(-)
> > >   create mode 100644 include/linux/mfd/qcom_pm8008.h
> > > 
> > > diff --git a/drivers/mfd/qcom-pm8008.c b/drivers/mfd/qcom-pm8008.c
> > > index 569ffd50..55e2a8e 100644
> > > --- a/drivers/mfd/qcom-pm8008.c
> > > +++ b/drivers/mfd/qcom-pm8008.c
> > > @@ -9,6 +9,7 @@
> > >   #include <linux/interrupt.h>
> > >   #include <linux/irq.h>
> > >   #include <linux/irqdomain.h>
> > > +#include <linux/mfd/qcom_pm8008.h>
> > >   #include <linux/module.h>
> > >   #include <linux/of_device.h>
> > >   #include <linux/of_platform.h>
> > > @@ -57,6 +58,7 @@ enum {
> > >   struct pm8008_data {
> > >   	struct device *dev;
> > > +	struct regmap *regulators_regmap;
> > >   	int irq;
> > >   	struct regmap_irq_chip_data *irq_data;
> > >   };
> > > @@ -150,6 +152,12 @@ static struct regmap_config qcom_mfd_regmap_cfg = {
> > >   	.max_register	= 0xFFFF,
> > >   };
> > > +struct regmap *pm8008_get_regmap(const struct pm8008_data *chip)
> > > +{
> > > +	return chip->regulators_regmap;
> > > +}
> > > +EXPORT_SYMBOL_GPL(pm8008_get_regmap);
> > Seems like abstraction for the sake of abstraction.
> > 
> > Why not do the dereference inside the regulator driver?
> 
> To derefer this in the regulator driver, we need to have the pm8008_data
> struct definition in the qcom_pm8008 header file.
> 
> I think it doesn't look great to have only that structure in header and all
> other structs and enum in the mfd driver.

Then why pass 'pm8008_data' at all?

What's preventing you from passing 'regmap'?

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