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Date: Wed, 18 Mar 2020 09:53:45 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Michael Walle <michael@...le.cc>, linux-gpio@...r.kernel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-hwmon@...r.kernel.org, linux-pwm@...r.kernel.org,
linux-watchdog@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org
Cc: Linus Walleij <linus.walleij@...aro.org>,
Bartosz Golaszewski <bgolaszewski@...libre.com>,
Rob Herring <robh+dt@...nel.org>,
Jean Delvare <jdelvare@...e.com>,
Lee Jones <lee.jones@...aro.org>,
Thierry Reding <thierry.reding@...il.com>,
Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
Wim Van Sebroeck <wim@...ux-watchdog.org>,
Shawn Guo <shawnguo@...nel.org>, Li Yang <leoyang.li@....com>,
Thomas Gleixner <tglx@...utronix.de>,
Jason Cooper <jason@...edaemon.net>,
Marc Zyngier <maz@...nel.org>
Subject: Re: [PATCH 06/18] irqchip: add sl28cpld interrupt controller support
On 3/17/20 1:50 PM, Michael Walle wrote:
> This patch adds support for the interrupt controller inside the sl28
> CPLD management controller.
>
> Signed-off-by: Michael Walle <michael@...le.cc>
> ---
> drivers/irqchip/Kconfig | 3 ++
> drivers/irqchip/Makefile | 1 +
> drivers/irqchip/irq-sl28cpld.c | 92 ++++++++++++++++++++++++++++++++++
> drivers/mfd/Kconfig | 4 +-
> 4 files changed, 98 insertions(+), 2 deletions(-)
> create mode 100644 drivers/irqchip/irq-sl28cpld.c
>
> diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
> index 24fe08702ef7..3fd7415c8b55 100644
> --- a/drivers/irqchip/Kconfig
> +++ b/drivers/irqchip/Kconfig
> @@ -246,6 +246,9 @@ config RENESAS_RZA1_IRQC
> Enable support for the Renesas RZ/A1 Interrupt Controller, to use up
> to 8 external interrupts with configurable sense select.
>
> +config SL28CPLD_INTC
> + bool
> +
> config ST_IRQCHIP
> bool
> select REGMAP
> diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
> index eae0d78cbf22..0f4a37782609 100644
> --- a/drivers/irqchip/Makefile
> +++ b/drivers/irqchip/Makefile
> @@ -105,3 +105,4 @@ obj-$(CONFIG_MADERA_IRQ) += irq-madera.o
> obj-$(CONFIG_LS1X_IRQ) += irq-ls1x.o
> obj-$(CONFIG_TI_SCI_INTR_IRQCHIP) += irq-ti-sci-intr.o
> obj-$(CONFIG_TI_SCI_INTA_IRQCHIP) += irq-ti-sci-inta.o
> +obj-$(CONFIG_SL28CPLD_INTC) += irq-sl28cpld.o
> diff --git a/drivers/irqchip/irq-sl28cpld.c b/drivers/irqchip/irq-sl28cpld.c
> new file mode 100644
> index 000000000000..fa52ed79137b
> --- /dev/null
> +++ b/drivers/irqchip/irq-sl28cpld.c
> @@ -0,0 +1,92 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * SMARC-sAL28 Interrupt core driver.
> + *
> + * Copyright 2019 Kontron Europe GmbH
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_address.h>
> +#include <linux/of_platform.h>
> +#include <linux/i2c.h>
> +#include <linux/regmap.h>
> +#include <linux/interrupt.h>
> +#include <linux/mfd/core.h>
> +
> +#define INTC_IE 0
> +#define INTC_IP 1
> +
> +static const struct regmap_irq sl28cpld_irqs[] = {
> + REGMAP_IRQ_REG_LINE(0, 8),
> + REGMAP_IRQ_REG_LINE(1, 8),
> + REGMAP_IRQ_REG_LINE(2, 8),
> + REGMAP_IRQ_REG_LINE(3, 8),
> + REGMAP_IRQ_REG_LINE(4, 8),
> + REGMAP_IRQ_REG_LINE(5, 8),
> + REGMAP_IRQ_REG_LINE(6, 8),
> + REGMAP_IRQ_REG_LINE(7, 8),
> +};
> +
> +struct sl28cpld_intc {
> + struct regmap *regmap;
> + struct regmap_irq_chip chip;
> + struct regmap_irq_chip_data *irq_data;
> +};
> +
> +static int sl28cpld_intc_probe(struct platform_device *pdev)
> +{
> + struct sl28cpld_intc *irqchip;
> + struct resource *res;
> + unsigned int irq;
> + int ret;
> +
> + irqchip = devm_kzalloc(&pdev->dev, sizeof(*irqchip), GFP_KERNEL);
> + if (!irqchip)
> + return -ENOMEM;
> +
> + if (!pdev->dev.parent)
> + return -ENODEV;
> +
> + irqchip->regmap = dev_get_regmap(pdev->dev.parent, NULL);
> + if (!irqchip->regmap)
> + return -ENODEV;
> +
> + irq = platform_get_irq(pdev, 0);
> + if (irq < 0)
> + return irq;
> +
> + res = platform_get_resource(pdev, IORESOURCE_REG, 0);
> + if (!res)
> + return -EINVAL;
> +
> + irqchip->chip.name = "sl28cpld-intc";
> + irqchip->chip.irqs = sl28cpld_irqs;
> + irqchip->chip.num_irqs = ARRAY_SIZE(sl28cpld_irqs);
> + irqchip->chip.num_regs = 1;
> + irqchip->chip.status_base = res->start + INTC_IP;
> + irqchip->chip.mask_base = res->start + INTC_IE;
> + irqchip->chip.mask_invert = true,
> + irqchip->chip.ack_base = res->start + INTC_IP;
> +
> + ret = devm_regmap_add_irq_chip(&pdev->dev, irqchip->regmap, irq,
> + IRQF_SHARED | IRQF_ONESHOT, 0,
> + &irqchip->chip, &irqchip->irq_data);
> + if (ret)
> + return ret;
> + dev_info(&pdev->dev, "registered IRQ %d\n", irq);
> +
> + return 0;
> +}
> +
> +static struct platform_driver sl28cpld_intc_driver = {
> + .probe = sl28cpld_intc_probe,
> + .driver = {
> + .name = "sl28cpld-intc",
> + }
> +};
> +module_platform_driver(sl28cpld_intc_driver);
> +
> +MODULE_DESCRIPTION("sl28cpld Interrupt Controller Driver");
> +MODULE_LICENSE("GPL");
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index 01588c366476..4f741d640705 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -2060,12 +2060,12 @@ config SGI_MFD_IOC3
> then say Y. Otherwise say N.
>
> config MFD_SL28CPLD
> - tristate "Kontron sl28 core driver"
> + bool "Kontron sl28 core driver"
This is .... unusual. Why declare it tristate only to re-declare it bool in the next patch ?
It does explain the I2C=y, but I really think it should be bool from the start if it ends up
there.
> depends on I2C=y
> depends on OF
> select REGMAP_I2C
> select REGMAP_IRQ
> - select SL28CPLD_IRQ
> + select SL28CPLD_INTC
What is the point of introducing SL28CPLD_IRQ in the first place ?
> select MFD_CORE
> help
> This option enables support for the board management controller
>
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