linux-kernel - Re: [PATCH v7 06/11] pinctrl: rp1: Implement RaspberryPi RP1 gpio support

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Message-ID: <Z6tUzcCqI2xdKSQ5@apocalypse>
Date: Tue, 11 Feb 2025 14:46:53 +0100
From: Andrea della Porta <andrea.porta@...e.com>
To: Stefan Wahren <wahrenst@....net>
Cc: Andrea della Porta <andrea.porta@...e.com>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...nel.org>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Florian Fainelli <florian.fainelli@...adcom.com>,
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczynski <kw@...ux.com>,
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>, Bartosz Golaszewski <brgl@...ev.pl>,
	Derek Kiernan <derek.kiernan@....com>,
	Dragan Cvetic <dragan.cvetic@....com>,
	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Saravana Kannan <saravanak@...gle.com>, linux-clk@...r.kernel.org,
	devicetree@...r.kernel.org, linux-rpi-kernel@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org, linux-gpio@...r.kernel.org,
	Masahiro Yamada <masahiroy@...nel.org>,
	Herve Codina <herve.codina@...tlin.com>,
	Luca Ceresoli <luca.ceresoli@...tlin.com>,
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
	Andrew Lunn <andrew@...n.ch>
Subject: Re: [PATCH v7 06/11] pinctrl: rp1: Implement RaspberryPi RP1 gpio
 support

Hi Stefan,

On 15:36 Sat 08 Feb     , Stefan Wahren wrote:
> Hi Andrea,
> 
> Am 07.02.25 um 22:31 schrieb Andrea della Porta:
> > The RP1 is an MFD supporting a gpio controller and /pinmux/pinctrl.
> > Add minimum support for the gpio only portion. The driver is in
> > pinctrl folder since upcoming patches will add the pinmux/pinctrl
> > support where the gpio part can be seen as an addition.
> > 
> > Signed-off-by: Andrea della Porta <andrea.porta@...e.com>
> > Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
> > Reviewed-by: Stefan Wahren <wahrenst@....net>
> > ---
> >   MAINTAINERS                   |   1 +
> >   drivers/pinctrl/Kconfig       |  11 +
> >   drivers/pinctrl/Makefile      |   1 +
> >   drivers/pinctrl/pinctrl-rp1.c | 789 ++++++++++++++++++++++++++++++++++
> >   4 files changed, 802 insertions(+)
> >   create mode 100644 drivers/pinctrl/pinctrl-rp1.c
> > 
> > diff --git a/MAINTAINERS b/MAINTAINERS
> > index a4a9555c07c5..f2ba6f565d30 100644
> > --- a/MAINTAINERS
> > +++ b/MAINTAINERS
> > @@ -19756,6 +19756,7 @@ F:	Documentation/devicetree/bindings/misc/pci1de4,1.yaml
> >   F:	Documentation/devicetree/bindings/pci/pci-ep-bus.yaml
> >   F:	Documentation/devicetree/bindings/pinctrl/raspberrypi,rp1-gpio.yaml
> >   F:	drivers/clk/clk-rp1.c
> > +F:	drivers/pinctrl/pinctrl-rp1.c
> >   F:	include/dt-bindings/clock/rp1.h
> >   F:	include/dt-bindings/misc/rp1.h
> > 
> > diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
> > index 95a8e2b9a614..53b265cabc26 100644
> > --- a/drivers/pinctrl/Kconfig
> > +++ b/drivers/pinctrl/Kconfig
> > @@ -612,6 +612,17 @@ config PINCTRL_MLXBF3
> >   	  each pin. This driver can also be built as a module called
> >   	  pinctrl-mlxbf3.
> > 
> > +config PINCTRL_RP1
> > +	tristate "Pinctrl driver for RP1"
> > +	depends on MISC_RP1
> > +	default MISC_RP1
> > +	select PINMUX
> > +	select PINCONF
> > +	select GENERIC_PINCONF
> > +	help
> > +	  Enable the gpio and pinctrl/mux driver for RaspberryPi RP1
> > +	  multi function device.
> > +
> >   source "drivers/pinctrl/actions/Kconfig"
> >   source "drivers/pinctrl/aspeed/Kconfig"
> >   source "drivers/pinctrl/bcm/Kconfig"
> > diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile
> > index fba1c56624c0..6fb77de58545 100644
> > --- a/drivers/pinctrl/Makefile
> > +++ b/drivers/pinctrl/Makefile
> > @@ -48,6 +48,7 @@ obj-$(CONFIG_PINCTRL_PIC32)	+= pinctrl-pic32.o
> >   obj-$(CONFIG_PINCTRL_PISTACHIO)	+= pinctrl-pistachio.o
> >   obj-$(CONFIG_PINCTRL_RK805)	+= pinctrl-rk805.o
> >   obj-$(CONFIG_PINCTRL_ROCKCHIP)	+= pinctrl-rockchip.o
> > +obj-$(CONFIG_PINCTRL_RP1)       += pinctrl-rp1.o
> >   obj-$(CONFIG_PINCTRL_SCMI)	+= pinctrl-scmi.o
> >   obj-$(CONFIG_PINCTRL_SINGLE)	+= pinctrl-single.o
> >   obj-$(CONFIG_PINCTRL_ST) 	+= pinctrl-st.o
> > diff --git a/drivers/pinctrl/pinctrl-rp1.c b/drivers/pinctrl/pinctrl-rp1.c
> > new file mode 100644
> > index 000000000000..0d081f75d2ec
> > --- /dev/null
> > +++ b/drivers/pinctrl/pinctrl-rp1.c
> > @@ -0,0 +1,789 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Driver for Raspberry Pi RP1 GPIO unit
> > + *
> > + * Copyright (C) 2023 Raspberry Pi Ltd.
> > + *
> > + * This driver is inspired by:
> > + * pinctrl-bcm2835.c, please see original file for copyright information
> > + */
> > +
> ...
> > +
> > +static struct irq_chip rp1_gpio_irq_chip = {
> > +	.name = MODULE_NAME,
> > +	.irq_enable = rp1_gpio_irq_enable,
> > +	.irq_disable = rp1_gpio_irq_disable,
> > +	.irq_set_type = rp1_gpio_irq_set_type,
> > +	.irq_ack = rp1_gpio_irq_ack,
> > +	.irq_mask = rp1_gpio_irq_disable,
> > +	.irq_unmask = rp1_gpio_irq_enable,
> > +	.flags = IRQCHIP_IMMUTABLE,
> Sorry not sure, but doesn't this miss GPIOCHIP_IRQ_RESOURCE_HELPERS here?

Right. Added.

Thanks,
Andrea

> 
> Thanks