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Some SoCs in the mpc83xx family, e.g. mpc8309, have a dedicated spi chip select, SPISEL_BOOT, that is used by the boot code to boot from flash. This chip select will typically be used to select a SPI boot flash. The SPISEL_BOOT signal is controlled by a single bit in the SPI_CS register. Implement a gpio driver for the spi chip select register. This allows a spi driver capable of using gpios as chip select, to bind a chip select to SPISEL_BOOT. It may be a little odd to do this as a GPIO driver, since the signal is neither GP or I, but it is quite convenient to present it to the spi driver that way. The alternative it to teach mpc8xxx_spi to handle the SPISEL_BOOT signal itself (that is how it's done in the linux kernel, see commit 69b921acae8a) Signed-off-by: Klaus H. Sorensen <khso@prevas.dk> Signed-off-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk> |
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| .. | ||
| altera_pio.txt | ||
| bcm2835-gpio.txt | ||
| fsl,mpc83xx-spisel-boot.txt | ||
| gpio-msm.txt | ||
| gpio-pcf857x.txt | ||
| gpio-samsung.txt | ||
| gpio.txt | ||
| intel,apl-gpio.txt | ||
| intel,x86-broadwell-pinctrl.txt | ||
| intel,x86-pinctrl.txt | ||
| mscc_sgpio.txt | ||
| nvidia,tegra20-gpio.txt | ||
| nvidia,tegra186-gpio.txt | ||
| pm8916_gpio.txt | ||
| snps,creg-gpio.txt | ||