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Date: Wed, 18 Mar 2020 18:06:15 +0100
From: Michael Walle <michael@...le.cc>
To: Guenter Roeck <linux@...ck-us.net>
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,
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>,
Guenter Roeck <groeck7@...il.com>
Subject: Re: [PATCH 06/18] irqchip: add sl28cpld interrupt controller support
Am 2020-03-18 17:53, schrieb Guenter Roeck:
> 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 ?
I though it was a good idea to have that gradually build up, esp. since
these patches might go through different reviewers/trees. That being
said,
I'll change it though.
> It does explain the I2C=y, but I really think it should be bool from
> the start if it ends up
> there.
Ok.
>
>> 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 ?
oh damn. this is a left-over which slipped through. There should just
be a SL28CPLD_INTC.
-michael
>
>> select MFD_CORE
>> help
>> This option enables support for the board management controller
>>
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