.. .. In my dts I have my chipselect defined as follows: gpt4: timer@640 { // General Purpose Timer GPT4 in GPIO mode for SMC4000IO chip select. compatible = "fsl,mpc5200b-gpt-gpio","fsl,mpc5200-gpt-gpio"; cell-index = <4>; reg = <0x640 0x10>; interrupts = <1 13 0>; interrupt-parent = <&mpc5200_pic>; gpio-controller; #gpio-cells = <2>; }; I found the gpio in # cat /sys/class/gpio/gpiochip215/label /soc5200@f0000000/timer@640 The spi controller is defined like this: spi@2400 { device_type = "spi"; #address-cells = <1>; #size-cells = <0>; compatible = "fsl,mpc5200-psc-spi","fsl,mpc5200b-psc-spi"; cell-index = <2>; reg = <2400 100>; interrupts = <2 3 0>; interrupt-parent = <&mpc5200_pic>; gpios = <&gpt4 0 0>; io-controller@0 { compatible = "microkey,smc4000io"; spi-max-frequency = <1000000>; reg = <0>; }; }; At bootup linux (2.6.27) reports: mpc52xx-psc-spi f0000960.spi: probe called without platform data, no (de)activate_cs function will be called. Is my assumption wrong that the gpios property is the way to map chipselects to the spi driver? Thanks in advance. Henk.