18c2ecf20Sopenharmony_ciSPI NAND flash 28c2ecf20Sopenharmony_ci 38c2ecf20Sopenharmony_ciRequired properties: 48c2ecf20Sopenharmony_ci- compatible: should be "spi-nand" 58c2ecf20Sopenharmony_ci- reg: should encode the chip-select line used to access the NAND chip 6