Re: [PATCH v2 09/17] mfd: Support for ROHM BD71815 PMIC core

Matti Vaittinen
2021-01-26T05:36:32Z

Hello Lee,

Thanks again for the review!

On Mon, 2021-01-25 at 14:10 +0000, Lee Jones wrote:
> On Tue, 19 Jan 2021, Matti Vaittinen wrote:
>
> > Add core support for ROHM BD71815 Power Management IC.
> >
> > The IC integrates regulators, a battery charger with a coulomb
> > counter,
> > a real-time clock (RTC), clock gate and general-purpose outputs
> > (GPO).
> >
> > Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
> > ---
> > Changes since v1:
> > - Used BIT() for better readability
> > - removed some unused definitions
> >
> > drivers/mfd/Kconfig | 15 +-
> > drivers/mfd/rohm-bd71828.c | 416 +++++++++++++++++++++--
> > include/linux/mfd/rohm-bd71815.h | 561
> > +++++++++++++++++++++++++++++++
> > include/linux/mfd/rohm-bd71828.h | 3 +
> > 4 files changed, 952 insertions(+), 43 deletions(-)
> > create mode 100644 include/linux/mfd/rohm-bd71815.h
> >
> > diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> > index bdfce7b15621..59bfacb91898 100644
> > --- a/drivers/mfd/Kconfig
> > +++ b/drivers/mfd/Kconfig
> > @@ -1984,19 +1984,20 @@ config MFD_ROHM_BD70528
> > charger.
> >
> > config MFD_ROHM_BD71828
> > - tristate "ROHM BD71828 Power Management IC"
> > + tristate "ROHM BD71828 and BD71815 Power Management IC"
> > depends on I2C=y
> > depends on OF
> > select REGMAP_I2C
> > select REGMAP_IRQ
> > select MFD_CORE
> > help
> > - Select this option to get support for the ROHM BD71828 Power
> > - Management IC. BD71828GW is a single-chip power management IC
> > for
> > - battery-powered portable devices. The IC integrates 7 buck
> > - converters, 7 LDOs, and a 1500 mA single-cell linear charger.
> > - Also included is a Coulomb counter, a real-time clock (RTC),
> > and
> > - a 32.768 kHz clock gate.
> > + Select this option to get support for the ROHM BD71828 and
> > BD71815
> > + Power Management ICs. BD71828GW and BD71815AGW are single-
> > chip power
> > + management ICs mainly for battery-powered portable devices.
> > + The BD71828 integrates 7 buck converters and 7 LDOs. The
> > BD71815
> > + has 5 bucks, 7 LDOs, and a boost for driving LEDs. Both ICs
> > provide
> > + also a single-cell linear charger, a Coulomb counter, a real-
> > time
> > + clock (RTC), GPIOs and a 32.768 kHz clock gate.
> >
> > config MFD_STM32_LPTIMER
> > tristate "Support for STM32 Low-Power Timer"
> > diff --git a/drivers/mfd/rohm-bd71828.c b/drivers/mfd/rohm-
> > bd71828.c
> > index 210261d026f2..28b82477ce4c 100644
> > --- a/drivers/mfd/rohm-bd71828.c
> > +++ b/drivers/mfd/rohm-bd71828.c
> > @@ -2,7 +2,7 @@
> > //
> > // Copyright (C) 2019 ROHM Semiconductors
> > //
> > -// ROHM BD71828 PMIC driver
> > +// ROHM BD71828/BD71815 PMIC driver
> >
> > #include <linux/gpio_keys.h>
> > #include <linux/i2c.h>
> > @@ -11,7 +11,9 @@
> > #include <linux/ioport.h>
> > #include <linux/irq.h>
> > #include <linux/mfd/core.h>
> > +#include <linux/mfd/rohm-bd71815.h>
> > #include <linux/mfd/rohm-bd71828.h>
> > +#include <linux/mfd/rohm-generic.h>
> > #include <linux/module.h>
> > #include <linux/of_device.h>
> > #include <linux/regmap.h>
> > @@ -29,12 +31,102 @@ static struct gpio_keys_platform_data
> > bd71828_powerkey_data = {
> > .name = "bd71828-pwrkey",
> > };
> >
> > -static const struct resource rtc_irqs[] = {
> > +static const struct resource bd71815_rtc_irqs[] = {
> > + DEFINE_RES_IRQ_NAMED(BD71815_INT_RTC0, "bd71815-rtc-alm-0"),
> > + DEFINE_RES_IRQ_NAMED(BD71815_INT_RTC1, "bd71815-rtc-alm-1"),
> > + DEFINE_RES_IRQ_NAMED(BD71815_INT_RTC2, "bd71815-rtc-alm-2"),
> > +};
> > +
> > +static const struct resource bd71828_rtc_irqs[] = {
> > DEFINE_RES_IRQ_NAMED(BD71828_INT_RTC0, "bd71828-rtc-alm-0"),
> > DEFINE_RES_IRQ_NAMED(BD71828_INT_RTC1, "bd71828-rtc-alm-1"),
> > DEFINE_RES_IRQ_NAMED(BD71828_INT_RTC2, "bd71828-rtc-alm-2"),
> > };
> >
> > +static struct resource bd71815_power_irqs[] = {
> > + DEFINE_RES_IRQ_NAMED(BD71815_INT_DCIN_RMV, "bd71815-dcin-rmv"),
> > + DEFINE_RES_IRQ_NAMED(BD71815_INT_CLPS_OUT, "bd71815-clps-out"),
> > + DEFINE_RES_IRQ_NAMED(BD71815_INT_CLPS_IN, "bd71815-clps-in"),
> > + DEFINE_RES_IRQ_NAMED(BD71815_INT_DCIN_OVP_RES, "bd71815-dcin-
> > ovp-res"),
> > + DEFINE_RES_IRQ_NAMED(BD71815_INT_DCIN_OVP_DET, "bd71815-dcin-
> > ovp-det"),
> > + DEFINE_RES_IRQ_NAMED(BD71815_INT_DCIN_MON_RES, "bd71815-dcin-
> > mon-res"),
> > + DEFINE_RES_IRQ_NAMED(BD71815_INT_DCIN_MON_DET, "bd71815-dcin-
> > mon-det"),
> > + DEFINE_RES_IRQ_NAMED(BD71815_INT_VSYS_UV_RES, "bd71815-vsys-uv-
> > res"),
> > + DEFINE_RES_IRQ_NAMED(BD71815_INT_VSYS_UV_DET, "bd71815-vsys-uv-
> > det"),
> > + DEFINE_RES_IRQ_NAMED(BD71815_INT_VSYS_LOW_RES, "bd71815-vsys-
> > low-res"),
> > + DEFINE_RES_IRQ_NAMED(BD71815_INT_VSYS_LOW_DET, "bd71815-vsys-
> > low-det"),
> > + DEFINE_RES_IRQ_NAMED(BD71815_INT_VSYS_MON_RES, "bd71815-vsys-
> > mon-res"),
> > + DEFINE_RES_IRQ_NAMED(BD71815_INT_VSYS_MON_RES, "bd71815-vsys-
> > mon-det"),
> > + DEFINE_RES_IRQ_NAMED(BD71815_INT_CHG_WDG_TEMP, "bd71815-chg-
> > wdg-temp"),
> > + DEFINE_RES_IRQ_NAMED(BD71815_INT_CHG_WDG_TIME, "bd71815-chg-
> > wdg"),
> > + DEFINE_RES_IRQ_NAMED(BD71815_INT_CHG_RECHARGE_RES, "bd71815-
> > rechg-res"),
> > + DEFINE_RES_IRQ_NAMED(BD71815_INT_CHG_RECHARGE_DET, "bd71815-
> > rechg-det"),
> > + DEFINE_RES_IRQ_NAMED(BD71815_INT_CHG_RANGED_TEMP_TRANSITION,
> > + "bd71815-ranged-temp-transit"),
>
> The new line limit is 100. Feel free to run these out.

I learn new things every day it seems. This change is more than
welcome!

> > + if (!strncmp(mode, "open-drain", 10)) {
> > + dev_dbg(dev, "configuring clk32kout as open-drain");
>
> Do you *really* need these?

No. development leftover. Thanks for pointing that.

> >
> > + button_irq = 0;
> > + dev_info(&i2c->dev, "BD71815 found\n");
>
> Again, are these *really* useful to you and/or your users?
>
> Besides, this device not *found* i.e. scanned/read and instantiated,
> it has simply been matched from the local DTB. It can still be
> wrong. You can probably omit them.

You're right. One can check the DT contents from /proc if he wants to
check what IC compatible was used. Thanks.
>
> [...]
>
> > diff --git a/include/linux/mfd/rohm-bd71815.h
> > b/include/linux/mfd/rohm-bd71815.h
> > new file mode 100644
> > index 000000000000..8ee5874a5b73
> > --- /dev/null
> > +++ b/include/linux/mfd/rohm-bd71815.h
> > @@ -0,0 +1,561 @@
> > +/* SPDX-License-Identifier: GPL-2.0-or-later */
> > +/*
> > + * Copyright 2014 Embest Technology Co. Ltd. Inc.
>
> Jeeze! Is this for the Amiga?

Nah. Long live NXP SOCs! ;) I think BD71815 was _originally_ developed
for i.MX6.

>
> > + * Author: yanglsh@embest-tech.com
> > + *
> > + * 2020, 2021 Heavily modified by:
>
> You should probably add a proper copyright.
Ok. I guess I can do so. Thanks!

> > + * Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
> > + */
> > +
> > +#ifndef _MFD_BD71815_H
> > +#define _MFD_BD71815_H
> > +
> > +#include <linux/regmap.h>

Best Regards
-- Matti Vaittinen