Hi,
the system I used is:
SDK version: ti-processor-sdk-linux-am335x-evm-01.00.00.00
Processor: AM3357
Package: ZCZ
My purpose is to use PIN NAME SPI0_SCLK, SPI0_CS0, SPI0_D0 and SPI0_D1 as gpio pins.
By am3357 datasheet, the RESET REL. MODE of above four pins is "mode 7". That's to say, if I DON'T set any pin-mux in DTS, I will got mode 7 after booting system. After I experimented, I got
{
root@arm:/sys/kernel/debug/pinctrl/44e10800.pinmux# cat pins | grep 44e1095
pin 84 (44e10950.0) 00000020 pinctrl-single
pin 85 (44e10954.0) 00000020 pinctrl-single
pin 86 (44e10958.0) 00000030 pinctrl-single
pin 87 (44e1095c.0) 00000030 pinctrl-single
}
I wonder why these pins are mode 0?
Does anything i ignore to do in source code?
any suggestion welcome, thanks.
In contrast to above experiment, I set spi pin-mux in DTS. And I got the mode as I expected.
{
part 1:
spi0_pins: pinmux_spi0_pins {
pinctrl-single,pins = <
0x150 (PIN_INPUT_PULLUP | MUX_MODE0) /* spi0_sclk.spi0_sclk */
0x154 (PIN_INPUT_PULLUP | MUX_MODE0) /* spi0_d0.spi0_d0 */
0x158 (PIN_OUTPUT_PULLUP | MUX_MODE0) /* spi0_d1.spi0_d1 */
0x15c (PIN_OUTPUT_PULLUP | MUX_MODE0) /* spi0_cs0.spi0_cs0 */
>;
};
root@arm:/sys/kernel/debug/pinctrl/44e10800.pinmux# cat pins | grep 44e1095
pin 84 (44e10950.0) 00000030 pinctrl-single
pin 85 (44e10954.0) 00000030 pinctrl-single
pin 86 (44e10958.0) 00000010 pinctrl-single
pin 87 (44e1095c.0) 00000010 pinctrl-single
part 2:
spi0_pins: pinmux_spi0_pins {
pinctrl-single,pins = <
0x150 (MUX_MODE7) /* spi0_sclk.spi0_sclk */
0x154 (MUX_MODE7) /* spi0_d0.spi0_d0 */
0x158 (MUX_MODE7) /* spi0_d1.spi0_d1 */
0x15c (MUX_MODE7) /* spi0_cs0.spi0_cs0 */
>;
};
root@arm:/proc# cd /sys/kernel/debug/pinctrl/44e1080cat pins | grep 44e1095
pin 84 (44e10950.0) 00000007 pinctrl-single
pin 85 (44e10954.0) 00000007 pinctrl-single
pin 86 (44e10958.0) 00000007 pinctrl-single
pin 87 (44e1095c.0) 00000007 pinctrl-single
}
