On Fri, 5 Oct 2018 11:41:59 +0200 <christophe.kerello@xxxxxx> wrote: > +struct stm32_fmc2 { You should inherit from nand_controller even if the nand_chip already embeds a dummy nand controller object. struct nand_controller base; > + struct stm32_fmc2_nand nand; > + struct device *dev; > + void __iomem *io_base; > + void __iomem *data_base[FMC2_MAX_CE]; > + void __iomem *cmd_base[FMC2_MAX_CE]; > + void __iomem *addr_base[FMC2_MAX_CE]; > + phys_addr_t io_phys_addr; > + phys_addr_t data_phys_addr[FMC2_MAX_CE]; > + struct clk *clk; > + > + struct dma_chan *dma_tx_ch; > + struct dma_chan *dma_rx_ch; > + struct dma_chan *dma_ecc_ch; > + struct sg_table dma_data_sg; > + struct sg_table dma_ecc_sg; > + u8 *ecc_buf; > + int dma_ecc_len; > + > + struct completion complete; > + struct completion dma_data_complete; > + struct completion dma_ecc_complete; > + > + u8 cs_assigned; > + int cs_sel; > +};