diff mbox series

[v4,03/11] irqchip: add sl28cpld interrupt controller support

Message ID 20200604211039.12689-4-michael@walle.cc (mailing list archive)
State Not Applicable
Headers show
Series Add support for Kontron sl28cpld | expand

Commit Message

Michael Walle June 4, 2020, 9:10 p.m. UTC 
Add support for the interrupt controller inside the sl28 CPLD management
controller.

The interrupt controller can handle at most 8 interrupts and is really
simplistic and consists only of an interrupt mask and an interrupt
pending register.

Signed-off-by: Michael Walle <michael@walle.cc>
---
 drivers/irqchip/Kconfig        |   3 +
 drivers/irqchip/Makefile       |   1 +
 drivers/irqchip/irq-sl28cpld.c | 102 +++++++++++++++++++++++++++++++++
 drivers/mfd/Kconfig            |   2 +
 4 files changed, 108 insertions(+)
 create mode 100644 drivers/irqchip/irq-sl28cpld.c

Comments

kernel test robot June 5, 2020, 1:26 a.m. UTC | #1 
Hi Michael,

I love your patch! Perhaps something to improve:

[auto build test WARNING on next-20200604]
[cannot apply to gpio/for-next hwmon/hwmon-next ljones-mfd/for-mfd-next shawnguo/for-next v5.7 v5.7-rc7 v5.7-rc6 v5.7]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Michael-Walle/Add-support-for-Kontron-sl28cpld/20200605-051333
base:    d4899e5542c15062cc55cac0ca99025bb64edc61
config: mips-allyesconfig (attached as .config)
compiler: mips-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=mips 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>, old ones prefixed by <<):

drivers/irqchip/irq-sl28cpld.c: In function 'sl28cpld_intc_probe':
>> drivers/irqchip/irq-sl28cpld.c:56:10: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits]
56 |  if (irq < 0)
|          ^

vim +56 drivers/irqchip/irq-sl28cpld.c

    35	
    36	static int sl28cpld_intc_probe(struct platform_device *pdev)
    37	{
    38		struct device *dev = &pdev->dev;
    39		struct sl28cpld_intc *irqchip;
    40		unsigned int irq;
    41		u32 base;
    42		int ret;
    43	
    44		if (!dev->parent)
    45			return -ENODEV;
    46	
    47		irqchip = devm_kzalloc(dev, sizeof(*irqchip), GFP_KERNEL);
    48		if (!irqchip)
    49			return -ENOMEM;
    50	
    51		irqchip->regmap = dev_get_regmap(dev->parent, NULL);
    52		if (!irqchip->regmap)
    53			return -ENODEV;
    54	
    55		irq = platform_get_irq(pdev, 0);
  > 56		if (irq < 0)
    57			return irq;
    58	
    59		ret = device_property_read_u32(&pdev->dev, "reg", &base);
    60		if (ret)
    61			return -EINVAL;
    62	
    63		irqchip->chip.name = "sl28cpld-intc";
    64		irqchip->chip.irqs = sl28cpld_irqs;
    65		irqchip->chip.num_irqs = ARRAY_SIZE(sl28cpld_irqs);
    66		irqchip->chip.num_regs = 1;
    67		irqchip->chip.status_base = base + INTC_IP;
    68		irqchip->chip.mask_base = base + INTC_IE;
    69		irqchip->chip.mask_invert = true,
    70		irqchip->chip.ack_base = base + INTC_IP;
    71	
    72		return devm_regmap_add_irq_chip_np(&pdev->dev, dev->of_node,
    73						   irqchip->regmap, irq,
    74						   IRQF_SHARED | IRQF_ONESHOT, 0,
    75						   &irqchip->chip, &irqchip->irq_data);
    76	}
    77	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
Andy Shevchenko June 5, 2020, 8:07 a.m. UTC | #2 
On Fri, Jun 5, 2020 at 12:13 AM Michael Walle <michael@walle.cc> wrote:
>
> Add support for the interrupt controller inside the sl28 CPLD management
> controller.
>
> The interrupt controller can handle at most 8 interrupts and is really
> simplistic and consists only of an interrupt mask and an interrupt
> pending register.

...

> +config SL28CPLD_INTC
> +       bool

Same Q: Why not module?

...

> +static const struct of_device_id sl28cpld_intc_of_match[] = {
> +       { .compatible = "kontron,sl28cpld-intc" },

> +       {},

There is no point to have comma in terminator line.

> +};
kernel test robot June 8, 2020, 3:12 p.m. UTC | #3 
Hi Michael,

I love your patch! Perhaps something to improve:

[auto build test WARNING on next-20200604]
[cannot apply to gpio/for-next hwmon/hwmon-next ljones-mfd/for-mfd-next shawnguo/for-next v5.7 v5.7-rc7 v5.7-rc6 v5.7]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Michael-Walle/Add-support-for-Kontron-sl28cpld/20200605-051333
base:    d4899e5542c15062cc55cac0ca99025bb64edc61
:::::: branch date: 26 hours ago
:::::: commit date: 26 hours ago
compiler: gcc-9 (Debian 9.3.0-13) 9.3.0

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>


cppcheck warnings: (new ones prefixed by >>)

>> drivers/irqchip/irq-sl28cpld.c:56:10: warning: Checking if unsigned variable 'irq' is less than zero. [unsignedLessThanZero]
    if (irq < 0)
            ^

# https://github.com/0day-ci/linux/commit/b13743c1f1a52746beaa071e5d008c84d59fbd7f
git remote add linux-review https://github.com/0day-ci/linux
git remote update linux-review
git checkout b13743c1f1a52746beaa071e5d008c84d59fbd7f
vim +/irq +56 drivers/irqchip/irq-sl28cpld.c

b13743c1f1a527 Michael Walle 2020-06-04  35  
b13743c1f1a527 Michael Walle 2020-06-04  36  static int sl28cpld_intc_probe(struct platform_device *pdev)
b13743c1f1a527 Michael Walle 2020-06-04  37  {
b13743c1f1a527 Michael Walle 2020-06-04  38  	struct device *dev = &pdev->dev;
b13743c1f1a527 Michael Walle 2020-06-04  39  	struct sl28cpld_intc *irqchip;
b13743c1f1a527 Michael Walle 2020-06-04  40  	unsigned int irq;
b13743c1f1a527 Michael Walle 2020-06-04  41  	u32 base;
b13743c1f1a527 Michael Walle 2020-06-04  42  	int ret;
b13743c1f1a527 Michael Walle 2020-06-04  43  
b13743c1f1a527 Michael Walle 2020-06-04  44  	if (!dev->parent)
b13743c1f1a527 Michael Walle 2020-06-04  45  		return -ENODEV;
b13743c1f1a527 Michael Walle 2020-06-04  46  
b13743c1f1a527 Michael Walle 2020-06-04  47  	irqchip = devm_kzalloc(dev, sizeof(*irqchip), GFP_KERNEL);
b13743c1f1a527 Michael Walle 2020-06-04  48  	if (!irqchip)
b13743c1f1a527 Michael Walle 2020-06-04  49  		return -ENOMEM;
b13743c1f1a527 Michael Walle 2020-06-04  50  
b13743c1f1a527 Michael Walle 2020-06-04  51  	irqchip->regmap = dev_get_regmap(dev->parent, NULL);
b13743c1f1a527 Michael Walle 2020-06-04  52  	if (!irqchip->regmap)
b13743c1f1a527 Michael Walle 2020-06-04  53  		return -ENODEV;
b13743c1f1a527 Michael Walle 2020-06-04  54  
b13743c1f1a527 Michael Walle 2020-06-04  55  	irq = platform_get_irq(pdev, 0);
b13743c1f1a527 Michael Walle 2020-06-04 @56  	if (irq < 0)
b13743c1f1a527 Michael Walle 2020-06-04  57  		return irq;
b13743c1f1a527 Michael Walle 2020-06-04  58  
b13743c1f1a527 Michael Walle 2020-06-04  59  	ret = device_property_read_u32(&pdev->dev, "reg", &base);
b13743c1f1a527 Michael Walle 2020-06-04  60  	if (ret)
b13743c1f1a527 Michael Walle 2020-06-04  61  		return -EINVAL;
b13743c1f1a527 Michael Walle 2020-06-04  62  
b13743c1f1a527 Michael Walle 2020-06-04  63  	irqchip->chip.name = "sl28cpld-intc";
b13743c1f1a527 Michael Walle 2020-06-04  64  	irqchip->chip.irqs = sl28cpld_irqs;
b13743c1f1a527 Michael Walle 2020-06-04  65  	irqchip->chip.num_irqs = ARRAY_SIZE(sl28cpld_irqs);
b13743c1f1a527 Michael Walle 2020-06-04  66  	irqchip->chip.num_regs = 1;
b13743c1f1a527 Michael Walle 2020-06-04  67  	irqchip->chip.status_base = base + INTC_IP;
b13743c1f1a527 Michael Walle 2020-06-04  68  	irqchip->chip.mask_base = base + INTC_IE;
b13743c1f1a527 Michael Walle 2020-06-04  69  	irqchip->chip.mask_invert = true,
b13743c1f1a527 Michael Walle 2020-06-04  70  	irqchip->chip.ack_base = base + INTC_IP;
b13743c1f1a527 Michael Walle 2020-06-04  71  
b13743c1f1a527 Michael Walle 2020-06-04  72  	return devm_regmap_add_irq_chip_np(&pdev->dev, dev->of_node,
b13743c1f1a527 Michael Walle 2020-06-04  73  					   irqchip->regmap, irq,
b13743c1f1a527 Michael Walle 2020-06-04  74  					   IRQF_SHARED | IRQF_ONESHOT, 0,
b13743c1f1a527 Michael Walle 2020-06-04  75  					   &irqchip->chip, &irqchip->irq_data);
b13743c1f1a527 Michael Walle 2020-06-04  76  }
b13743c1f1a527 Michael Walle 2020-06-04  77  

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
diff mbox series

Patch

diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
index 3e473f4eb175..c4b840bc982e 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 3a4ce283189a..bcd9797a5aed 100644
--- a/drivers/irqchip/Makefile
+++ b/drivers/irqchip/Makefile
@@ -110,3 +110,4 @@  obj-$(CONFIG_LOONGSON_HTPIC)		+= irq-loongson-htpic.o
 obj-$(CONFIG_LOONGSON_HTVEC)		+= irq-loongson-htvec.o
 obj-$(CONFIG_LOONGSON_PCH_PIC)		+= irq-loongson-pch-pic.o
 obj-$(CONFIG_LOONGSON_PCH_MSI)		+= irq-loongson-pch-msi.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..2151f1b390d7
--- /dev/null
+++ b/drivers/irqchip/irq-sl28cpld.c
@@ -0,0 +1,102 @@ 
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * sl28cpld interrupt controller driver.
+ *
+ * Copyright 2019 Kontron Europe GmbH
+ */
+
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/property.h>
+#include <linux/regmap.h>
+
+#define INTC_IE 0x00
+#define INTC_IP 0x01
+
+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 device *dev = &pdev->dev;
+	struct sl28cpld_intc *irqchip;
+	unsigned int irq;
+	u32 base;
+	int ret;
+
+	if (!dev->parent)
+		return -ENODEV;
+
+	irqchip = devm_kzalloc(dev, sizeof(*irqchip), GFP_KERNEL);
+	if (!irqchip)
+		return -ENOMEM;
+
+	irqchip->regmap = dev_get_regmap(dev->parent, NULL);
+	if (!irqchip->regmap)
+		return -ENODEV;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0)
+		return irq;
+
+	ret = device_property_read_u32(&pdev->dev, "reg", &base);
+	if (ret)
+		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 = base + INTC_IP;
+	irqchip->chip.mask_base = base + INTC_IE;
+	irqchip->chip.mask_invert = true,
+	irqchip->chip.ack_base = base + INTC_IP;
+
+	return devm_regmap_add_irq_chip_np(&pdev->dev, dev->of_node,
+					   irqchip->regmap, irq,
+					   IRQF_SHARED | IRQF_ONESHOT, 0,
+					   &irqchip->chip, &irqchip->irq_data);
+}
+
+static const struct of_device_id sl28cpld_intc_of_match[] = {
+	{ .compatible = "kontron,sl28cpld-intc" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, sl28cpld_intc_of_match);
+
+static const struct platform_device_id sl28cpld_intc_id_table[] = {
+	{ "sl28cpld-intc" },
+	{}
+};
+MODULE_DEVICE_TABLE(platform, sl28cpld_intc_id_table);
+
+static struct platform_driver sl28cpld_intc_driver = {
+	.probe	= sl28cpld_intc_probe,
+	.id_table = sl28cpld_intc_id_table,
+	.driver = {
+		.name = KBUILD_MODNAME,
+		.of_match_table = sl28cpld_intc_of_match,
+	}
+};
+module_platform_driver(sl28cpld_intc_driver);
+
+MODULE_DESCRIPTION("sl28cpld Interrupt Controller Driver");
+MODULE_AUTHOR("Michael Walle <michael@walle.cc>");
+MODULE_LICENSE("GPL");
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 5c0cd514d197..9c84c5746698 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -2114,6 +2114,8 @@  config MFD_SL28CPLD
 	depends on I2C=y
 	depends on OF
 	select REGMAP_I2C
+	select REGMAP_IRQ
+	select SL28CPLD_INTC
 	select MFD_CORE
 	help
 	  This option enables support for the board management controller