Re: [PATCH v4 2/4] gpio: spacemit: add support for K1 SoC

[Yixun Lan <dlan@gentoo.org>]

On 11:38 Tue 21 Jan     , Yixun Lan wrote:
> Implement GPIO functionality which capable of setting pin as
> input, output. Also, each pin can be used as interrupt which
> support rising, failing, or both edge type trigger.
> 
> Signed-off-by: Yixun Lan <dlan@gentoo.org>
> ---
>  drivers/gpio/Kconfig            |   7 +
>  drivers/gpio/Makefile           |   1 +
>  drivers/gpio/gpio-spacemit-k1.c | 295 ++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 303 insertions(+)
> 
> diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
> index 56fee58e281e7cac7f287eb04e4c17a17f75ed04..c153f5439649da020ee42c38e88cb8df31a8e307 100644
> --- a/drivers/gpio/Kconfig
> +++ b/drivers/gpio/Kconfig
> @@ -654,6 +654,13 @@ config GPIO_SNPS_CREG
>  	  where only several fields in register belong to GPIO lines and
>  	  each GPIO line owns a field with different length and on/off value.
>  
> +config GPIO_SPACEMIT_K1
> +	bool "SPACEMIT K1 GPIO support"
> +	depends on ARCH_SPACEMIT || COMPILE_TEST
> +	select GPIOLIB_IRQCHIP
> +	help
> +	  Say yes here to support the SpacemiT's K1 GPIO device.
> +
>  config GPIO_SPEAR_SPICS
>  	bool "ST SPEAr13xx SPI Chip Select as GPIO support"
>  	depends on PLAT_SPEAR
> diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
> index af3ba4d81b583842893ea69e677fbe2abf31bc7b..6709ce511a0cf10310a94521c85a2d382dcfa696 100644
> --- a/drivers/gpio/Makefile
> +++ b/drivers/gpio/Makefile
> @@ -156,6 +156,7 @@ obj-$(CONFIG_GPIO_SIOX)			+= gpio-siox.o
>  obj-$(CONFIG_GPIO_SL28CPLD)		+= gpio-sl28cpld.o
>  obj-$(CONFIG_GPIO_SLOPPY_LOGIC_ANALYZER) += gpio-sloppy-logic-analyzer.o
>  obj-$(CONFIG_GPIO_SODAVILLE)		+= gpio-sodaville.o
> +obj-$(CONFIG_GPIO_SPACEMIT_K1)		+= gpio-spacemit-k1.o
>  obj-$(CONFIG_GPIO_SPEAR_SPICS)		+= gpio-spear-spics.o
>  obj-$(CONFIG_GPIO_SPRD)			+= gpio-sprd.o
>  obj-$(CONFIG_GPIO_STMPE)		+= gpio-stmpe.o
> diff --git a/drivers/gpio/gpio-spacemit-k1.c b/drivers/gpio/gpio-spacemit-k1.c
> new file mode 100644
> index 0000000000000000000000000000000000000000..de0491af494c10f528095efee9b3a140bdcc0b0d
> --- /dev/null
> +++ b/drivers/gpio/gpio-spacemit-k1.c
> @@ -0,0 +1,295 @@
> +// SPDX-License-Identifier: GPL-2.0 OR MIT
> +/*
> + * Copyright (C) 2023-2025 SpacemiT (Hangzhou) Technology Co. Ltd
> + * Copyright (c) 2025 Yixun Lan <dlan@gentoo.org>
> + */
> +
omit ..
> +static int spacemit_gpio_get_ports(struct device *dev, struct spacemit_gpio *gpio,
> +				   void __iomem *regs)
> +{
> +	struct spacemit_gpio_port *port;
> +	u32 i = 0, offset;
> +
> +	gpio->nr_ports = device_get_child_node_count(dev);
> +	if (gpio->nr_ports == 0)
> +		return -ENODEV;
> +
> +	gpio->ports = devm_kcalloc(dev, gpio->nr_ports, sizeof(*gpio->ports), GFP_KERNEL);
> +	if (!gpio->ports)
> +		return -ENOMEM;
> +
> +	device_for_each_child_node_scoped(dev, fwnode)  {
> +		port		= &gpio->ports[i];
> +		port->fwnode	= fwnode;
> +		port->index	= i++;
> +
> +		if (fwnode_property_read_u32(fwnode, "reg", &offset))
> +			return -EINVAL;
> +
> +		port->base	= regs + offset;
> +		port->irq	= fwnode_irq_get(fwnode, 0);
> +	}
> +
> +	return 0;
> +}
> +
> +static int spacemit_gpio_add_port(struct spacemit_gpio *gpio, int index)
> +{
> +	struct spacemit_gpio_port *port;
> +	struct device *dev = gpio->dev;
> +	struct gpio_irq_chip *girq;
> +	void __iomem *dat, *set, *clr, *dirin, *dirout;
> +	int ret;
> +
> +	port = &gpio->ports[index];
> +	port->gpio = gpio;
> +
> +	dat	= port->base + GPLR;
> +	set	= port->base + GPSR;
> +	clr	= port->base + GPCR;
> +	dirin	= port->base + GCDR;
> +	dirout	= port->base + GSDR;
> +
> +	/* This registers 32 GPIO lines per port */
> +	ret = bgpio_init(&port->gc, dev, 4, dat, set, clr, dirout, dirin,
> +			 BGPIOF_UNREADABLE_REG_SET | BGPIOF_UNREADABLE_REG_DIR);

Esmil point out bgpio_init() require a GPIO_GENERIC dependency, will fix it

-- 
Yixun Lan (dlan)
Gentoo Linux Developer
GPG Key ID AABEFD55