Re: [PATCH 1/5] i2c: core: Pick i2c bus number from ACPI if present

[kernel test robot <lkp@intel.com>]

Hi Binbin,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on wsa/i2c/for-next]
[also build test ERROR on linus/master v6.0-rc6 next-20220921]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Binbin-Zhou/i2c-ls2x-Add-support-for-the-Loongson-2K-LS7A-I2C/20220922-194252
base:   https://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git i2c/for-next
config: arc-randconfig-r043-20220922 (https://download.01.org/0day-ci/archive/20220923/202209230216.faCwluIB-lkp@intel.com/config)
compiler: arceb-elf-gcc (GCC) 12.1.0
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
        # https://github.com/intel-lab-lkp/linux/commit/749fc796eb66dc42c209c6a5808c6b2a5e47fbb6
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Binbin-Zhou/i2c-ls2x-Add-support-for-the-Loongson-2K-LS7A-I2C/20220922-194252
        git checkout 749fc796eb66dc42c209c6a5808c6b2a5e47fbb6
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=arc SHELL=/bin/bash drivers/

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

All errors (new ones prefixed by >>):

   drivers/i2c/i2c-core-base.c: In function 'i2c_add_adapter':
>> drivers/i2c/i2c-core-base.c:1568:26: error: implicit declaration of function 'acpi_evaluate_integer'; did you mean 'acpi_evaluate_object'? [-Werror=implicit-function-declaration]
    1568 |                 status = acpi_evaluate_integer(ACPI_HANDLE(dev->parent),
         |                          ^~~~~~~~~~~~~~~~~~~~~
         |                          acpi_evaluate_object
   cc1: some warnings being treated as errors


vim +1568 drivers/i2c/i2c-core-base.c

  1540	
  1541	/**
  1542	 * i2c_add_adapter - declare i2c adapter, use dynamic bus number
  1543	 * @adapter: the adapter to add
  1544	 * Context: can sleep
  1545	 *
  1546	 * This routine is used to declare an I2C adapter when its bus number
  1547	 * doesn't matter or when its bus number is specified by an dt alias.
  1548	 * Examples of bases when the bus number doesn't matter: I2C adapters
  1549	 * dynamically added by USB links or PCI plugin cards.
  1550	 *
  1551	 * When this returns zero, a new bus number was allocated and stored
  1552	 * in adap->nr, and the specified adapter became available for clients.
  1553	 * Otherwise, a negative errno value is returned.
  1554	 */
  1555	int i2c_add_adapter(struct i2c_adapter *adapter)
  1556	{
  1557		struct device *dev = &adapter->dev;
  1558		acpi_status status;
  1559		unsigned long long id;
  1560	
  1561		if (dev->of_node) {
  1562			id = of_alias_get_id(dev->of_node, "i2c");
  1563			if (id >= 0) {
  1564				adapter->nr = id;
  1565				return __i2c_add_numbered_adapter(adapter);
  1566			}
  1567		} else if (dev->parent->fwnode) {
> 1568			status = acpi_evaluate_integer(ACPI_HANDLE(dev->parent),
  1569							"_UID", NULL, &id);
  1570			if (ACPI_SUCCESS(status) && (id >= 0)) {
  1571				adapter->nr = id;
  1572				return __i2c_add_numbered_adapter(adapter);
  1573			}
  1574		}
  1575	
  1576		mutex_lock(&core_lock);
  1577		id = idr_alloc(&i2c_adapter_idr, adapter,
  1578			       __i2c_first_dynamic_bus_num, 0, GFP_KERNEL);
  1579		mutex_unlock(&core_lock);
  1580		if (WARN(id < 0, "couldn't get idr"))
  1581			return id;
  1582	
  1583		adapter->nr = id;
  1584	
  1585		return i2c_register_adapter(adapter);
  1586	}
  1587	EXPORT_SYMBOL(i2c_add_adapter);
  1588	

-- 
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