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

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Message-ID: <8e2b0e05-cd60-4b79-8763-005c3f72a64d@gmx.net>
Date: Sat, 8 Feb 2025 15:36:56 +0100
From: Stefan Wahren <wahrenst@....net>
To: 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 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?

Thanks