Q: Hardware driver for multiple NAND chips

[khp]

Does the nand driver support multiple chips in the same board?
In some hardware the nand chips share ALE and CLE pins while /CE pins have 
separate control lines for each chip. 
But hwcontrol function examples in the directory driver/mtd/nand contain 
simply NAND_CTL_SETNCE and NAND_CTL_CLRNCE functions. 
How to activate individual chip explicitly when several /CE pins exist?

TIA.