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
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