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From:   ChiYuan Huang <u0084500@gmail.com>
Date:   Mon, 27 Jun 2022 22:56:22 +0800
Message-ID: <CADiBU3802sLTPjrGiaQ-xw-2jep1UXo+t7pYc6bCC4MiJLhOyA@mail.gmail.com>
Subject: Re: [PATCH v2 2/4] mfd: rt5120: Add Richtek PMIC support
To:     Lee Jones <lee.jones@linaro.org>
Cc:     Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Mark Brown <broonie@kernel.org>, dmitry.torokhov@gmail.com,
        Liam Girdwood <lgirdwood@gmail.com>,
        cy_huang <cy_huang@richtek.com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@vger.kernel.org>, lkml <linux-kernel@vger.kernel.org>,
        linux-input@vger.kernel.org
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Lee Jones <lee.jones@linaro.org> =E6=96=BC 2022=E5=B9=B46=E6=9C=8827=E6=97=
=A5 =E9=80=B1=E4=B8=80 =E6=99=9A=E4=B8=8A10:22=E5=AF=AB=E9=81=93=EF=BC=9A
>
> On Wed, 22 Jun 2022, cy_huang wrote:
>
> > From: ChiYuan Huang <cy_huang@richtek.com>
> >
> > Add Richtek RT5120 PMIC I2C driver.
>
> Why a whole new driver?
>
> How different is this to rt5033?
>
> Looks like this could easily be woven into this existing support?
>
It's different with the function domain.
RT5033 is most like as the SubPMIC that includes PMU (battery
charger/gauge/led/few buck and ldo)
RT5120 is a main PMIC with default-on power that follows the boot on sequen=
ce.
RT5120 only integrates regulator and power key report module.

> > Signed-off-by: ChiYuan Huang <cy_huang@richtek.com>
> > ---
> >  drivers/mfd/Kconfig  |  12 +++++
> >  drivers/mfd/Makefile |   1 +
> >  drivers/mfd/rt5120.c | 125 +++++++++++++++++++++++++++++++++++++++++++=
++++++++
> >  3 files changed, 138 insertions(+)
> >  create mode 100644 drivers/mfd/rt5120.c
> >
> > diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> > index 3b59456..866619c 100644
> > --- a/drivers/mfd/Kconfig
> > +++ b/drivers/mfd/Kconfig
> > @@ -1127,6 +1127,18 @@ config MFD_RT5033
> >         sub-devices like charger, fuel gauge, flash LED, current source=
,
> >         LDO and Buck.
> >
> > +config MFD_RT5120
> > +     tristate "Richtek RT5120 Power Management IC"
> > +     depends on I2C
> > +     select MFD_CORE
> > +     select REGMAP_I2C
> > +     select REGMAP_IRQ
> > +     help
> > +       The enables support for Richtek RT5120 PMIC. It includes four h=
igh
> > +       efficiency buck converters and one LDO voltage regulator. The d=
evice
> > +       is targeted at providing the CPU voltage, memory, I/O and perip=
heral
> > +       power rails in home entertainment devices.
> > +
> >  config MFD_RC5T583
> >       bool "Ricoh RC5T583 Power Management system device"
> >       depends on I2C=3Dy
> > diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> > index 858cacf..27e8add 100644
> > --- a/drivers/mfd/Makefile
> > +++ b/drivers/mfd/Makefile
> > @@ -234,6 +234,7 @@ obj-$(CONFIG_MFD_HI655X_PMIC)   +=3D hi655x-pmic.o
> >  obj-$(CONFIG_MFD_DLN2)               +=3D dln2.o
> >  obj-$(CONFIG_MFD_RT4831)     +=3D rt4831.o
> >  obj-$(CONFIG_MFD_RT5033)     +=3D rt5033.o
> > +obj-$(CONFIG_MFD_RT5120)     +=3D rt5120.o
> >  obj-$(CONFIG_MFD_SKY81452)   +=3D sky81452.o
> >
> >  intel-soc-pmic-objs          :=3D intel_soc_pmic_core.o intel_soc_pmic=
_crc.o
> > diff --git a/drivers/mfd/rt5120.c b/drivers/mfd/rt5120.c
> > new file mode 100644
> > index 00000000..e7c5f3c
> > --- /dev/null
> > +++ b/drivers/mfd/rt5120.c
> > @@ -0,0 +1,125 @@
> > +// SPDX-License-Identifier: GPL-2.0+
> > +
> > +#include <linux/i2c.h>
> > +#include <linux/kernel.h>
> > +#include <linux/mfd/core.h>
> > +#include <linux/module.h>
> > +#include <linux/mod_devicetable.h>
> > +#include <linux/regmap.h>
> > +
> > +#define RT5120_REG_INTENABLE 0x1D
> > +#define RT5120_REG_INTSTAT   0x1E
> > +#define RT5120_REG_FZCMODE   0x44
> > +
> > +#define RT5120_INT_HOTDIE    0
> > +#define RT5120_INT_PWRKEY_REL        5
> > +#define RT5120_INT_PWRKEY_PRESS      6
> > +
> > +static const struct regmap_range rt5120_rd_yes_ranges[] =3D {
> > +     regmap_reg_range(0x03, 0x13),
> > +     regmap_reg_range(0x1c, 0x20),
> > +     regmap_reg_range(0x44, 0x44)
> > +};
> > +
> > +static const struct regmap_range rt5120_wr_yes_ranges[] =3D {
> > +     regmap_reg_range(0x06, 0x13),
> > +     regmap_reg_range(0x1c, 0x20),
> > +     regmap_reg_range(0x44, 0x44)
> > +};
> > +
> > +static const struct regmap_access_table rt5120_rd_table =3D {
> > +     .yes_ranges =3D rt5120_rd_yes_ranges,
> > +     .n_yes_ranges =3D ARRAY_SIZE(rt5120_rd_yes_ranges),
> > +};
> > +
> > +static const struct regmap_access_table rt5120_wr_table =3D {
> > +     .yes_ranges =3D rt5120_wr_yes_ranges,
> > +     .n_yes_ranges =3D ARRAY_SIZE(rt5120_wr_yes_ranges),
> > +};
> > +
> > +static const struct regmap_config rt5120_regmap_config =3D {
> > +     .reg_bits =3D 8,
> > +     .val_bits =3D 8,
> > +     .max_register =3D RT5120_REG_FZCMODE,
> > +
> > +     .wr_table =3D &rt5120_wr_table,
> > +     .rd_table =3D &rt5120_rd_table,
> > +};
> > +
> > +static const struct regmap_irq rt5120_irqs[] =3D {
> > +     REGMAP_IRQ_REG_LINE(RT5120_INT_HOTDIE, 8),
> > +     REGMAP_IRQ_REG_LINE(RT5120_INT_PWRKEY_REL, 8),
> > +     REGMAP_IRQ_REG_LINE(RT5120_INT_PWRKEY_PRESS, 8)
> > +};
> > +
> > +static const struct regmap_irq_chip rt5120_irq_chip =3D {
> > +     .name =3D "rt5120-pmic",
> > +     .status_base =3D RT5120_REG_INTSTAT,
> > +     .mask_base =3D RT5120_REG_INTENABLE,
> > +     .ack_base =3D RT5120_REG_INTSTAT,
> > +     .mask_invert =3D true,
> > +     .use_ack =3D true,
> > +     .num_regs =3D 1,
> > +     .irqs =3D rt5120_irqs,
> > +     .num_irqs =3D ARRAY_SIZE(rt5120_irqs),
> > +};
> > +
> > +static const struct resource rt5120_regulator_resources[] =3D {
> > +     DEFINE_RES_IRQ(RT5120_INT_HOTDIE)
> > +};
> > +
> > +static const struct resource rt5120_pwrkey_resources[] =3D {
> > +     DEFINE_RES_IRQ_NAMED(RT5120_INT_PWRKEY_PRESS, "pwrkey-press"),
> > +     DEFINE_RES_IRQ_NAMED(RT5120_INT_PWRKEY_REL, "pwrkey-release")
> > +};
> > +
> > +static const struct mfd_cell rt5120_devs[] =3D {
> > +     MFD_CELL_RES("rt5120-regulator", rt5120_regulator_resources),
> > +     MFD_CELL_OF("rt5120-pwrkey", rt5120_pwrkey_resources, NULL, 0, 0,
> > +                 "richtek,rt5120-pwrkey")
> > +};
> > +
> > +static int rt5120_probe(struct i2c_client *i2c)
> > +{
> > +     struct regmap *regmap;
> > +     struct regmap_irq_chip_data *irq_data;
> > +     int ret;
> > +
> > +     regmap =3D devm_regmap_init_i2c(i2c, &rt5120_regmap_config);
> > +     if (IS_ERR(regmap)) {
> > +             ret =3D PTR_ERR(regmap);
> > +             dev_err(&i2c->dev, "Failed to init regmap (%d)\n", ret);
> > +             return ret;
> > +     }
> > +
> > +     ret =3D devm_regmap_add_irq_chip(&i2c->dev, regmap, i2c->irq,
> > +                                    IRQF_ONESHOT, 0, &rt5120_irq_chip,
> > +                                    &irq_data);
> > +     if (ret) {
> > +             dev_err(&i2c->dev, "Failed to add irq chip (%d)\n", ret);
> > +             return ret;
> > +     }
> > +
> > +     return devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_AUTO, rt512=
0_devs,
> > +                                 ARRAY_SIZE(rt5120_devs), NULL, 0,
> > +                                 regmap_irq_get_domain(irq_data));
> > +}
> > +
> > +static const struct of_device_id rt5120_device_match_table[] =3D {
> > +     { .compatible =3D "richtek,rt5120", },
> > +     {}
> > +};
> > +MODULE_DEVICE_TABLE(of, rt5120_device_match_table);
> > +
> > +static struct i2c_driver rt5120_driver =3D {
> > +     .driver =3D {
> > +             .name =3D "rt5120",
> > +             .of_match_table =3D rt5120_device_match_table,
> > +     },
> > +     .probe_new =3D rt5120_probe,
> > +};
> > +module_i2c_driver(rt5120_driver);
> > +
> > +MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");
> > +MODULE_DESCRIPTION("Richtek RT5120 I2C driver");
> > +MODULE_LICENSE("GPL v2");
>
> --
> Lee Jones [=E6=9D=8E=E7=90=BC=E6=96=AF]
> Principal Technical Lead - Developer Services
> Linaro.org =E2=94=82 Open source software for Arm SoCs
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