Hi
I want to configure set of CPU pins to be used as GPIO inputs or outputs with default values. We are using am3352 CPU and custom board similar to Beaglebone Black.
I checked through debug logs that device tree get parsed correctly.
But when I check after the Kernel loads, All the GPIOs I have pinmuxed are in default state (ie: all are inputs and value is 0)
Directions and default values I set in device tree are not there. (reset?)
Any clue or help is much appreciated.
I decided to do this pinmuxing in device tree and my device tree entries are as follows.
/* In am33xx.dtsi, same file as used in Beaglebone Black */
gpio0: gpio@44e07000 {
compatible = "ti,omap4-gpio";
ti,hwmods = "gpio1";
gpio-controller;
#gpio-cells = <2>;
interrupt-controller;
#interrupt-cells = <2>;
reg = <0x44e07000 0x1000>;
interrupts = <96>;
};
gpio1: gpio@4804c000 {
compatible = "ti,omap4-gpio";
ti,hwmods = "gpio2";
gpio-controller;
#gpio-cells = <2>;
interrupt-controller;
#interrupt-cells = <2>;
reg = <0x4804c000 0x1000>;
interrupts = <98>;
};
gpio2: gpio@481ac000 {
compatible = "ti,omap4-gpio";
ti,hwmods = "gpio3";
gpio-controller;
#gpio-cells = <2>;
interrupt-controller;
#interrupt-cells = <2>;
reg = <0x481ac000 0x1000>;
interrupts = <32>;
};
gpio3: gpio@481ae000 {
compatible = "ti,omap4-gpio";
ti,hwmods = "gpio4";
gpio-controller;
#gpio-cells = <2>;
interrupt-controller;
#interrupt-cells = <2>;
reg = <0x481ae000 0x1000>;
interrupts = <62>;
};
/* Then in am335x-boneblack.dts file i have added following*/
&am33xx_pinmux {
gpio0_pins: gpio0_pins {
pinctrl-single,pins = <
0x144 (PIN_OUTPUT_PULLUP | MUX_MODE7) /* RMII1_REF_CLK as GPIO out */
0x158 (PIN_OUTPUT_PULLDOWN | MUX_MODE7) /* pin conf_spi0_d1 as GPIO out */
0x15c (PIN_OUTPUT_PULLDOWN | MUX_MODE7) /* pin conf_spi0_cs0 as GPIO out */
/*0x160 (PIN_INPUT | MUX_MODE7)*/ /* pin conf_spi0_cs1 as GPIO input */
>;
};
gpio1_pins: gpio1_pins {
pinctrl-single,pins = <
0x050 (PIN_INPUT | MUX_MODE7) /* pin conf_gpmc_a4 as GPIO input */
0x054 (PIN_OUTPUT_PULLUP | MUX_MODE7) /* pin conf_gpmc_a5 as GPIO out */
0x05c (PIN_INPUT | MUX_MODE7) /* pin conf_gpmc_a7 as GPIO input */
0x058 (PIN_OUTPUT_PULLDOWN | MUX_MODE7) /* pin conf_gpmc_a6 as GPIO out */
0x060 (PIN_INPUT | MUX_MODE7) /* pin conf_gpmc_a8 as GPIO input */
0x064 (PIN_INPUT | MUX_MODE7) /* pin conf_gpmc_a9 as GPIO input */
/*0x068 (PIN_OUTPUT_PULLUP | MUX_MODE7)*/ /* pin conf_gpmc_a10 as GPIO out */
0x06c (PIN_INPUT | MUX_MODE7) /* pin conf_gpmc_a11 as GPIO input */
/*0x078 (PIN_OUTPUT_PULLUP | MUX_MODE7)*/ /* pin gpmc_ben1 as GPIO out */
0x080 (PIN_INPUT | MUX_MODE7) /* pin conf_gpmc_csn1 as GPIO input */
0x084 (PIN_INPUT | MUX_MODE7) /* pin conf_gpmc_csn2 as GPIO input */
>;
};
gpio2_pins: gpio2_pins {
pinctrl-single,pins = <
0x088 (PIN_OUTPUT_PULLDOWN | MUX_MODE7) /* pin conf_gpmc_csn3 as GPIO output */
0x08c (PIN_INPUT | MUX_MODE7) /* pin conf_gpmc_csn3 as GPIO input */
0x0a4 (PIN_OUTPUT_PULLUP | MUX_MODE7) /* pin conf_lcd_data1 as GPIO out */
0x0a8 (PIN_OUTPUT_PULLDOWN | MUX_MODE7) /* pin conf_lcd_data2 as GPIO out */
0x0b0 (PIN_INPUT | MUX_MODE7) /* pin conf_lcd_data4 as GPIO input */
0x0b4 (PIN_OUTPUT_PULLDOWN | MUX_MODE7) /* pin conf_lcd_data5 as GPIO out */
0x0b8 (PIN_OUTPUT_PULLDOWN | MUX_MODE7) /* pin conf_lcd_data6 as GPIO out */
0x0bc (PIN_OUTPUT_PULLDOWN | MUX_MODE7) /* pin conf_lcd_data7 as GPIO out */
0x0e8 (PIN_INPUT | MUX_MODE7) /* pin conf_lcd_pclk as GPIO input */
0x0e0 (PIN_INPUT | MUX_MODE7) /* pin conf_lcd_vsync as GPIO input */
>;
};
gpio3_pins: gpio3_pins {
pinctrl-single,pins = <
/*0x1a0 (PIN_OUTPUT_PULLUP | MUX_MODE7)*/ /* pin conf_mcasp0_aclkr as GPIO out */
0x1a4 (PIN_INPUT | MUX_MODE7) /* pin conf_mcasp0_fsr as GPIO input */
0x1a8 (PIN_INPUT | MUX_MODE7) /* pin conf_mcasp0_axr1 as GPIO input */
>;
};
};
&gpio0{
ti,gpio-always-on;
pinctrl-names = "default";
pinctrl-0 = <&gpio0_pins>;
status = "okay";
};
&gpio1{
ti,gpio-always-on;
pinctrl-names = "default";
pinctrl-0 = <&gpio1_pins>;
status = "okay";
};
&gpio2{
ti,gpio-always-on;
pinctrl-names = "default";
pinctrl-0 = <&gpio2_pins>;
status = "okay";
};
&gpio3{
ti,gpio-always-on;
pinctrl-names = "default";
pinctrl-0 = <&gpio3_pins>;
status = "okay";
};
