[PATCH v14 2/3] i2c: aspeed: support AST2600 i2c new register mode driver

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

Hi Ryan,

kernel test robot noticed the following build errors:

[auto build test ERROR on v6.11]
[cannot apply to andi-shyti/i2c/i2c-host v6.12-rc1 linus/master next-20241004]
[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/Ryan-Chen/dt-bindings-i2c-aspeed-support-for-AST2600-i2cv2/20241002-150410
base:   v6.11
patch link:    https://lore.kernel.org/r/20241002070213.1165263-3-ryan_chen%40aspeedtech.com
patch subject: [PATCH v14 2/3] i2c: aspeed: support AST2600 i2c new register mode driver
config: x86_64-allyesconfig (https://download.01.org/0day-ci/archive/20241005/202410051759.bRIS387l-lkp at intel.com/config)
compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241005/202410051759.bRIS387l-lkp at 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/202410051759.bRIS387l-lkp at intel.com/

All errors (new ones prefixed by >>):

>> drivers/i2c/busses/i2c-ast2600.c:437:6: error: call to undeclared function 'get_unaligned_le16'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     437 |                                         get_unaligned_le16(&msg->buf[i2c_bus->master_xfer_cnt + i]);
         |                                         ^
>> drivers/i2c/busses/i2c-ast2600.c:441:6: error: call to undeclared function 'get_unaligned_le24'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     441 |                                         get_unaligned_le24(&msg->buf[i2c_bus->master_xfer_cnt + i]);
         |                                         ^
>> drivers/i2c/busses/i2c-ast2600.c:445:6: error: call to undeclared function 'get_unaligned_le32'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     445 |                                         get_unaligned_le32(&msg->buf[i2c_bus->master_xfer_cnt + i]);
         |                                         ^
   3 errors generated.


vim +/get_unaligned_le16 +437 drivers/i2c/busses/i2c-ast2600.c

   405	
   406	static int ast2600_i2c_setup_buff_tx(u32 cmd, struct ast2600_i2c_bus *i2c_bus)
   407	{
   408		struct i2c_msg *msg = &i2c_bus->msgs[i2c_bus->msgs_index];
   409		u32 wbuf_dword;
   410		int xfer_len;
   411		int i;
   412	
   413		cmd |= AST2600_I2CM_PKT_EN;
   414		xfer_len = msg->len - i2c_bus->master_xfer_cnt;
   415		if (xfer_len > i2c_bus->buf_size)
   416			xfer_len = i2c_bus->buf_size;
   417		else if (i2c_bus->msgs_index + 1 == i2c_bus->msgs_count)
   418			cmd |= AST2600_I2CM_STOP_CMD;
   419	
   420		if (cmd & AST2600_I2CM_START_CMD)
   421			cmd |= AST2600_I2CM_PKT_ADDR(msg->addr);
   422	
   423		if (xfer_len) {
   424			cmd |= AST2600_I2CM_TX_BUFF_EN | AST2600_I2CM_TX_CMD;
   425			/*
   426			 * The controller's buffer register supports dword writes only.
   427			 * Therefore, write dwords to the buffer register in a 4-byte aligned,
   428			 * and write the remaining unaligned data at the end.
   429			 */
   430			for (i = 0; i < xfer_len; i += 4) {
   431				switch (min(xfer_len - i, 4) % 4) {
   432				case 1:
   433					wbuf_dword = msg->buf[i2c_bus->master_xfer_cnt + i];
   434					break;
   435				case 2:
   436					wbuf_dword =
 > 437						get_unaligned_le16(&msg->buf[i2c_bus->master_xfer_cnt + i]);
   438					break;
   439				case 3:
   440					wbuf_dword =
 > 441						get_unaligned_le24(&msg->buf[i2c_bus->master_xfer_cnt + i]);
   442					break;
   443				default:
   444					wbuf_dword =
 > 445						get_unaligned_le32(&msg->buf[i2c_bus->master_xfer_cnt + i]);
   446					break;
   447				}
   448				writel(wbuf_dword, i2c_bus->buf_base + i);
   449			}
   450			writel(AST2600_I2CC_SET_TX_BUF_LEN(xfer_len),
   451			       i2c_bus->reg_base + AST2600_I2CC_BUFF_CTRL);
   452		}
   453	
   454		writel(cmd, i2c_bus->reg_base + AST2600_I2CM_CMD_STS);
   455	
   456		return 0;
   457	}
   458	

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