Re: [PATCH v2 2/6] i2c: core: Unify the firmware node type check

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

Hi Andy,

kernel test robot noticed the following build errors:

[auto build test ERROR on wsa/i2c/for-next]
[also build test ERROR on linus/master v6.15-rc1 next-20250407]
[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/Andy-Shevchenko/i2c-core-Drop-duplicate-check-before-calling-OF-APIs/20250407-180528
base:   https://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git i2c/for-next
patch link:    https://lore.kernel.org/r/20250407095852.215809-3-andriy.shevchenko%40linux.intel.com
patch subject: [PATCH v2 2/6] i2c: core: Unify the firmware node type check
config: arm-randconfig-002-20250407 (https://download.01.org/0day-ci/archive/20250407/202504072133.J8njROAD-lkp@intel.com/config)
compiler: clang version 21.0.0git (https://github.com/llvm/llvm-project 92c93f5286b9ff33f27ff694d2dc33da1c07afdd)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250407/202504072133.J8njROAD-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202504072133.J8njROAD-lkp@intel.com/

All errors (new ones prefixed by >>):

>> drivers/i2c/i2c-core-slave.c:117:3: error: call to undeclared function 'for_each_child_node_scoped'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     117 |                 for_each_child_node_scoped(fwnode, child) {
         |                 ^
>> drivers/i2c/i2c-core-slave.c:117:44: error: expected ';' after expression
     117 |                 for_each_child_node_scoped(fwnode, child) {
         |                                                          ^
         |                                                          ;
>> drivers/i2c/i2c-core-slave.c:117:38: error: use of undeclared identifier 'child'; did you mean 'ihold'?
     117 |                 for_each_child_node_scoped(fwnode, child) {
         |                                                    ^~~~~
         |                                                    ihold
   include/linux/fs.h:2758:13: note: 'ihold' declared here
    2758 | extern void ihold(struct inode * inode);
         |             ^
   drivers/i2c/i2c-core-slave.c:118:29: error: use of undeclared identifier 'child'; did you mean 'ihold'?
     118 |                         fwnode_property_read_u32(child, "reg", &reg);
         |                                                  ^~~~~
         |                                                  ihold
   include/linux/fs.h:2758:13: note: 'ihold' declared here
    2758 | extern void ihold(struct inode * inode);
         |             ^
   4 errors generated.


vim +/for_each_child_node_scoped +117 drivers/i2c/i2c-core-slave.c

    97	
    98	/**
    99	 * i2c_detect_slave_mode - detect operation mode
   100	 * @dev: The device owning the bus
   101	 *
   102	 * This checks the device nodes for an I2C slave by checking the address
   103	 * used in the reg property. If the address match the I2C_OWN_SLAVE_ADDRESS
   104	 * flag this means the device is configured to act as a I2C slave and it will
   105	 * be listening at that address.
   106	 *
   107	 * Returns true if an I2C own slave address is detected, otherwise returns
   108	 * false.
   109	 */
   110	bool i2c_detect_slave_mode(struct device *dev)
   111	{
   112		struct fwnode_handle *fwnode = dev_fwnode(dev);
   113	
   114		if (is_of_node(fwnode)) {
   115			u32 reg;
   116	
 > 117			for_each_child_node_scoped(fwnode, child) {

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