1*c66ec88fSEmmanuel VadotMacronix NANDs Device Tree Bindings 2*c66ec88fSEmmanuel Vadot----------------------------------- 3*c66ec88fSEmmanuel Vadot 4*c66ec88fSEmmanuel VadotMacronix NANDs support randomizer operation for scrambling user data, 5*c66ec88fSEmmanuel Vadotwhich can be enabled with a SET_FEATURE. The penalty when using the 6*c66ec88fSEmmanuel Vadotrandomizer are subpage accesses prohibited and more time period needed 7*c66ec88fSEmmanuel Vadotfor program operation, i.e., tPROG 300us to 340us (randomizer enabled). 8*c66ec88fSEmmanuel VadotEnabling the randomizer is a one time persistent and non reversible 9*c66ec88fSEmmanuel Vadotoperation. 10*c66ec88fSEmmanuel Vadot 11*c66ec88fSEmmanuel VadotFor more high-reliability concern, if subpage write is not available 12*c66ec88fSEmmanuel Vadotwith hardware ECC and not enabled at UBI level, then enabling the 13*c66ec88fSEmmanuel Vadotrandomizer is recommended by default by adding a new specific property 14*c66ec88fSEmmanuel Vadotin children nodes. 15*c66ec88fSEmmanuel Vadot 16*c66ec88fSEmmanuel VadotRequired NAND chip properties in children mode: 17*c66ec88fSEmmanuel Vadot- randomizer enable: should be "mxic,enable-randomizer-otp" 18*c66ec88fSEmmanuel Vadot 19*c66ec88fSEmmanuel VadotExample: 20*c66ec88fSEmmanuel Vadot 21*c66ec88fSEmmanuel Vadot nand: nand-controller@unit-address { 22*c66ec88fSEmmanuel Vadot 23*c66ec88fSEmmanuel Vadot nand@0 { 24*c66ec88fSEmmanuel Vadot reg = <0>; 25*c66ec88fSEmmanuel Vadot mxic,enable-randomizer-otp; 26*c66ec88fSEmmanuel Vadot }; 27*c66ec88fSEmmanuel Vadot }; 28