Hello, 赵仪峰 <yifeng.zhao@xxxxxxxxxxxxxx> wrote on Mon, 2 Nov 2020 11:46:04 +0800: > Hi Johan, > > void nand_deselect_target(struct nand_chip *chip) > { > if (chip->legacy.select_chip) > chip->legacy.select_chip(chip, -1); > > chip->cur_cs = -1; > } > > I need add the code below and it work. > > chip->legacy.select_chip = rk_nfc_select_chip; > > But I found almost all nandc drivers do not add this code. Is there any other way to implement it? Indeed, we don't accept new code we legacy bindings. I don't understand what extra consumption you are trying to avoid, because if it is the NAND device itself that is able to save power when it gets unselected, it's really none of you controller's business. Perhaps it's the time to focus on the controller support and tune the code base later in a bid to reduce consumption. Thanks, Miquèl