linux-kernel - Re: [PATCH 2/2] reset: tps380x: Add TPS380x device driver supprt

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Date:   Mon, 30 May 2022 09:00:14 +0200
From:   Marco Felsch <m.felsch@...gutronix.de>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     p.zabel@...gutronix.de, robh+dt@...nel.org, krzk+dt@...nel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel@...gutronix.de
Subject: Re: [PATCH 2/2] reset: tps380x: Add TPS380x device driver supprt

On 22-05-26, Krzysztof Kozlowski wrote:
> On 25/05/2022 16:20, Marco Felsch wrote:
> > The TI TPS380x family [1] is a volatage supervisor with a dedicated
> > manual reset (mr) line input and a reset output. The chip(s) have a
> > build in reset delay, depending on the chip partnumber. This simple
> > driver addresses this so the cosumer don't need to care about it.
> > 
> > [1] https://www.ti.com/product/TPS3801
> > 
> > Signed-off-by: Marco Felsch <m.felsch@...gutronix.de>
> > ---
> >  drivers/reset/Kconfig         |   8 +++
> >  drivers/reset/Makefile        |   1 +
> >  drivers/reset/reset-tps380x.c | 130 ++++++++++++++++++++++++++++++++++
> >  3 files changed, 139 insertions(+)
> >  create mode 100644 drivers/reset/reset-tps380x.c
> > 
> > diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig
> > index e0fc80e041ea..e2eb616af812 100644
> > --- a/drivers/reset/Kconfig
> > +++ b/drivers/reset/Kconfig
> > @@ -256,6 +256,14 @@ config RESET_TI_SYSCON
> >  	  you wish to use the reset framework for such memory-mapped devices,
> >  	  say Y here. Otherwise, say N.
> >  
> > +config RESET_TI_TPS380X
> > +	tristate "TI TPS380x Reset Driver"
> > +	select GPIOLIB
> > +	help
> > +	  This enables the reset driver support for TI TPS380x devices. If
> > +	  you wish to use the reset framework for such devices, say Y here.
> > +	  Otherwise, say N.
> > +
> >  config RESET_TN48M_CPLD
> >  	tristate "Delta Networks TN48M switch CPLD reset controller"
> >  	depends on MFD_TN48M_CPLD || COMPILE_TEST
> > diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile
> > index a80a9c4008a7..66399b92b1bb 100644
> > --- a/drivers/reset/Makefile
> > +++ b/drivers/reset/Makefile
> > @@ -33,6 +33,7 @@ obj-$(CONFIG_RESET_STARFIVE_JH7100) += reset-starfive-jh7100.o
> >  obj-$(CONFIG_RESET_SUNXI) += reset-sunxi.o
> >  obj-$(CONFIG_RESET_TI_SCI) += reset-ti-sci.o
> >  obj-$(CONFIG_RESET_TI_SYSCON) += reset-ti-syscon.o
> > +obj-$(CONFIG_RESET_TI_TPS380X) += reset-tps380x.o
> >  obj-$(CONFIG_RESET_TN48M_CPLD) += reset-tn48m.o
> >  obj-$(CONFIG_RESET_UNIPHIER) += reset-uniphier.o
> >  obj-$(CONFIG_RESET_UNIPHIER_GLUE) += reset-uniphier-glue.o
> > diff --git a/drivers/reset/reset-tps380x.c b/drivers/reset/reset-tps380x.c
> > new file mode 100644
> > index 000000000000..fd2c0929ae2d
> > --- /dev/null
> > +++ b/drivers/reset/reset-tps380x.c
> > @@ -0,0 +1,130 @@
> > +// SPDX-License-Identifier: GPL-2.0-or-later
> > +/*
> > + * TI TPS380x Supply Voltage Supervisor and Reset Controller Driver
> > + *
> > + * Copyright (C) 2022 Pengutronix, Marco Felsch <kernel@...gutronix.de>
> > + *
> > + * Based on Simple Reset Controller Driver
> > + *
> > + * Copyright (C) 2017 Pengutronix, Philipp Zabel <kernel@...gutronix.de>
> > + */
> > +
> > +#include <linux/delay.h>
> > +#include <linux/gpio/consumer.h>
> > +#include <linux/module.h>
> > +#include <linux/of.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/property.h>
> > +#include <linux/reset-controller.h>
> > +
> > +struct tps380x_reset {
> > +	struct reset_controller_dev	rcdev;
> > +	struct gpio_desc		*reset_gpio;
> > +	unsigned int			reset_ms;
> > +};
> > +
> > +struct tps380x_reset_devdata {
> > +	unsigned int min_reset_ms;
> > +	unsigned int typ_reset_ms;
> > +	unsigned int max_reset_ms;
> > +};
> > +
> > +static inline
> > +struct tps380x_reset *to_tps380x_reset(struct reset_controller_dev *rcdev)
> > +{
> > +	return container_of(rcdev, struct tps380x_reset, rcdev);
> > +}
> > +
> > +static int
> > +tps380x_reset_assert(struct reset_controller_dev *rcdev, unsigned long id)
> > +{
> > +	struct tps380x_reset *tps380x = to_tps380x_reset(rcdev);
> > +
> > +	gpiod_set_value_cansleep(tps380x->reset_gpio, 1);
> > +
> > +	return 0;
> > +}
> > +
> > +static int
> > +tps380x_reset_deassert(struct reset_controller_dev *rcdev, unsigned long id)
> > +{
> > +	struct tps380x_reset *tps380x = to_tps380x_reset(rcdev);
> > +
> > +	gpiod_set_value_cansleep(tps380x->reset_gpio, 0);
> > +	msleep(tps380x->reset_ms);
> > +
> > +	return 0;
> > +}
> > +
> > +const struct reset_control_ops reset_tps380x_ops = {
> 
> This looks static.

Hi Krzysztof,

Arg.. of course. I will change that. Thanks for the review.

Regards,
  Marco