linux-kernel - Re: [PATCH v8 02/11] mfd: sy7636a: Initial commit

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Message-ID: <CAKmqyKMZWVx3KqeysUjOc29nuxnwJfZ3wjmWjVwk9tpQ4dkh-A@mail.gmail.com>
Date:   Wed, 4 Aug 2021 18:22:00 +1000
From:   Alistair Francis <alistair23@...il.com>
To:     Lee Jones <lee.jones@...aro.org>
Cc:     Alistair Francis <alistair@...stair23.me>,
        Rob Herring <robh+dt@...nel.org>, lgirdwood@...il.com,
        Mark Brown <broonie@...nel.org>,
        dl-linux-imx <linux-imx@....com>,
        Sascha Hauer <kernel@...gutronix.de>,
        devicetree <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v8 02/11] mfd: sy7636a: Initial commit

On Tue, Aug 3, 2021 at 11:16 PM Lee Jones <lee.jones@...aro.org> wrote:
>
> On Tue, 03 Aug 2021, Alistair Francis wrote:
>
> > Initial support for the Silergy SY7636A Power Management chip.
> >
> > Signed-off-by: Alistair Francis <alistair@...stair23.me>
> > ---
> >  drivers/mfd/Kconfig         |  9 +++++
> >  drivers/mfd/Makefile        |  1 +
> >  drivers/mfd/sy7636a.c       | 72 +++++++++++++++++++++++++++++++++++++
> >  include/linux/mfd/sy7636a.h | 45 +++++++++++++++++++++++
> >  4 files changed, 127 insertions(+)
> >  create mode 100644 drivers/mfd/sy7636a.c
> >  create mode 100644 include/linux/mfd/sy7636a.h
> >
> > diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> > index 6a3fd2d75f96..b82208f0c79c 100644
> > --- a/drivers/mfd/Kconfig
> > +++ b/drivers/mfd/Kconfig
> > @@ -1352,6 +1352,15 @@ config MFD_SYSCON
> >         Select this option to enable accessing system control registers
> >         via regmap.
> >
> > +config MFD_SY7636A
> > +     tristate "Silergy SY7636A Power Management IC"
> > +     select MFD_CORE
> > +     select REGMAP_I2C
> > +     depends on I2C
> > +     help
> > +       Select this option to enable support for the Silergy SY7636A
> > +       Power Management IC.
> > +
> >  config MFD_DAVINCI_VOICECODEC
> >       tristate
> >       select MFD_CORE
> > diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> > index 8116c19d5fd4..cbe581e87fa9 100644
> > --- a/drivers/mfd/Makefile
> > +++ b/drivers/mfd/Makefile
> > @@ -266,6 +266,7 @@ obj-$(CONFIG_MFD_KHADAS_MCU)      += khadas-mcu.o
> >  obj-$(CONFIG_MFD_ACER_A500_EC)       += acer-ec-a500.o
> >  obj-$(CONFIG_MFD_QCOM_PM8008)        += qcom-pm8008.o
> >
> > +obj-$(CONFIG_MFD_SY7636A)    += sy7636a.o
> >  obj-$(CONFIG_SGI_MFD_IOC3)   += ioc3.o
> >  obj-$(CONFIG_MFD_SIMPLE_MFD_I2C)     += simple-mfd-i2c.o
> >  obj-$(CONFIG_MFD_INTEL_M10_BMC)   += intel-m10-bmc.o
> > diff --git a/drivers/mfd/sy7636a.c b/drivers/mfd/sy7636a.c
> > new file mode 100644
> > index 000000000000..f3ff93c7395d
> > --- /dev/null
> > +++ b/drivers/mfd/sy7636a.c
> > @@ -0,0 +1,72 @@
> > +// SPDX-License-Identifier: GPL-2.0+
> > +/*
> > + * MFD parent driver for SY7636A chip
> > + *
> > + * Copyright (C) 2021 reMarkable AS - http://www.remarkable.com/
> > + *
> > + * Authors: Lars Ivar Miljeteig <lars.ivar.miljeteig@...arkable.com>
> > + *          Alistair Francis <alistair@...stair23.me>
> > + *
> > + * Based on the lp87565 driver by Keerthy <j-keerthy@...com>
> > + */
> > +
> > +#include <linux/interrupt.h>
> > +#include <linux/mfd/core.h>
> > +#include <linux/module.h>
> > +#include <linux/of_device.h>
> > +
> > +#include <linux/mfd/sy7636a.h>
> > +
> > +static const struct regmap_config sy7636a_regmap_config = {
> > +     .reg_bits = 8,
> > +     .val_bits = 8,
> > +};
> > +
> > +static const struct mfd_cell sy7636a_cells[] = {
> > +     { .name = "sy7636a-regulator", },
>
> What kind of regulator is 'vcom'? LDO? DCDC?

Both I guess:

"SY7636A is a single-chip power management IC (PMIC) designed for
electronic paper display (EPD) applications. The device supports panel
sizes up to 9.7 inches and larger. The device integrates two
high-efficiency DC-DC boost converters, which are boosted to 25V and
-20V by two charge pumps to provide gate driver power for the panel.
Two tracking LDOs create a ±15V source driver power supply that
supports output currents up to 200mA. SY7636A also provides I2C
interface control for specific panel requirements"

Alistair

>
> > +     { .name = "sy7636a-temperature", },
> > +     { .name = "sy7636a-thermal", },
> > +};
>
> --
> Lee Jones [李琼斯]
> Senior Technical Lead - Developer Services
> Linaro.org │ Open source software for Arm SoCs
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