AM6412: GPIO write operation not done

Hi Karthick,

Which GPIO pin is this gpio384 for? Did you set its pinmux in kernel device tree? If so, please share the code change.

Hi Bin,

Thanks for your response. I want to toggle GPIO0_8, GPIO0_71, GPIO0_72 and GPIO1_17

For me,

gpiochip3: GPIOs 376-462, parent: platform/600000.gpio, 600000.gpio: --> GPIO0

gpiochip4: GPIOs 288-375, parent: platform/601000.gpio, 601000.gpio: --> GPIO1

So, For GPIO0_8 is 384 (376+8). But when I try to toggle the value is not changed.

I have appiled the patches as mentioned below in k3-am642-evm.dts and tried.

diff --git a/arch/arm64/boot/dts/ti/k3-am642-evm.dts b/arch/arm64/boot/dts/ti/k3-am642-evm.dts
index 2bd50d4bb..57d0412d9 100644
--- a/arch/arm64/boot/dts/ti/k3-am642-evm.dts
+++ b/arch/arm64/boot/dts/ti/k3-am642-evm.dts
@@ -463,6 +463,21 @@
AM64X_IOPAD(0x0270, PIN_INPUT, 0) /* (D18) ECAP0_IN_APWM_OUT */
>;
};
+
+ mygpio0_pins_default: mygpio0_pins_default {
+ pinctrl-single,pins = <
+ AM64X_IOPAD(0x0020, PIN_OUTPUT, 7) /* (P20) GPIO0_8 */
+ AM64X_IOPAD(0x0120, PIN_OUTPUT, 7) /* (U11) GPIO0_71 */
+ AM64X_IOPAD(0x0124, PIN_OUTPUT, 7) /* (V15) GPIO0_72 */
+ >;
+ };
+
+ mygpio1_pins_default: mygpio1_pins_default {
+ pinctrl-single,pins = <
+ AM64X_IOPAD(0x01a4, PIN_OUTPUT, 7) /* (U1) GPIO1_17 */
+ AM64X_IOPAD(0x01fc, PIN_OUTPUT, 7) /* (R2) GPIO1_39 */
+ >;
+ };

Still i cannot toggle, Am I missing anything ? 

Is mygpio0_pins_default  and  mygpio1_pins_default  is need to refer somwhere ?

Can you suggest what needs to be done for ? 

Hi Bin,

I have just added pinmux settings in &main_pmx0 node as mentioned below and tried but getting error duing booting.

diff --git a/arch/arm64/boot/dts/ti/k3-am642-evm.dts b/arch/arm64/boot/dts/ti/k3-am642-evm.dts
index 2bd50d4bb..5f9249e8e 100644
--- a/arch/arm64/boot/dts/ti/k3-am642-evm.dts
+++ b/arch/arm64/boot/dts/ti/k3-am642-evm.dts
@@ -314,6 +314,11 @@
&main_pmx0 {
main_mmc1_pins_default: main-mmc1-pins-default {
pinctrl-single,pins = <
+ AM64X_IOPAD(0x0020, PIN_INPUT, 7) /* (P20) GPIO0_8 */
+ AM64X_IOPAD(0x0120, PIN_INPUT, 7) /* (U11) GPIO0_71 */
+ AM64X_IOPAD(0x0124, PIN_INPUT, 7) /* (V15) GPIO0_72 */
+ AM64X_IOPAD(0x01a4, PIN_INPUT, 7) /* (U1) GPIO1_17 */
+ AM64X_IOPAD(0x01fc, PIN_INPUT, 7) /* (R2) GPIO1_39 */
AM64X_IOPAD(0x0294, PIN_INPUT_PULLUP, 0) /* (J19) MMC1_CMD */
AM64X_IOPAD(0x028c, PIN_INPUT_PULLDOWN, 0) /* (L20) MMC1_CLK */
AM64X_IOPAD(0x0288, PIN_INPUT_PULLUP, 0) /* (K21) MMC1_DAT0 */
@@ -463,6 +468,21 @@

Boot log : 
[ 1.613703] pinctrl-single f4000.pinctrl: pin-8 (fa00000.mmc) status -22
[ 1.623660] pinctrl-single f4000.pinctrl: could not request pin 8 (PIN8) from group main-mmc1-pins-default on device pinctrl-single

Providing sample patch for apply pimux settings for MAIN GPIO0 and GPIO1 would be helpful.

Karthick Krishnan said:

+ AM64X_IOPAD(0x0020, PIN_INPUT, 7) /* (P20) GPIO0_8 */

This pin is already defined in ospi0_pins_default. You cannot redefine it again without removing it from the OSPI pinmux.

Thanks Bin. Now I can able to toggle AM64x GPIO's.

Also, Can you suggest for toggling MCU_GPIO0_5 and read MCU_PORz (B21). 

I have followed this ticket : https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1023570/am6442-how-to-find-the-mcu-gpio-number-when-using-the-gpio-pin-in-linux

I can see that the gpio is being listed. Also I have applied u-boot patches for unlock padconf registers and DT patch. 

But I can't toggle MCU_GPIO0_5.

+ mymcu_gpio0_pins_default: mymcu_gpio0_pins_default {
+ pinctrl-single,pins = <
+ AM64X_MCU_IOPAD(0x0014, PIN_INPUT, 7) /* (A7) */
+ AM64X_MCU_IOPAD(0x005c, PIN_INPUT, 0) /* (B21) */
+ >;
+ };

Where I need to add this in k3-am642-evm.dts ? Can we able to read MCU_PORz(B21) pin and how ?

Hi Bin,

I have applied the below patches in k3-am642-evm.dts. GPIO is working fine. But Ethernet PHY device not loaded(eth0 interface). Without these changes eth0 is up.

Can you suggest what is the reason for this and how can work both at a time ?

&main_pmx0 {
main_mmc1_pins_default: main-mmc1-pins-default {
pinctrl-single,pins = <
+ AM64X_IOPAD(0x0020, PIN_INPUT, 7) /* (P20) */
+ AM64X_IOPAD(0x0120, PIN_INPUT, 7) /* (U11) */
+ AM64X_IOPAD(0x0124, PIN_INPUT, 7) /* (V15) */
+ AM64X_IOPAD(0x01a4, PIN_INPUT, 7) /* (U1) */
+ AM64X_IOPAD(0x01fc, PIN_INPUT, 7) /* (R2) */
+ AM64X_IOPAD(0x0154, PIN_INPUT, 7) /* (V12) */
+ AM64X_IOPAD(0x0140, PIN_INPUT, 7) /* (AA11) */

root@am64xx-evm:~# ip link
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: eth0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop qlen 1000
link/ether 34:08:e1:80:b4:cc brd ff:ff:ff:ff:ff:ff
3: eth1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop qlen 1000
link/ether e6:12:41:7b:af:91 brd ff:ff:ff:ff:ff:ff
4: can0: <NOARP40000> mtu 16 qdisc noop qlen 10
link/[280]
5: can1: <NOARP40000> mtu 16 qdisc noop qlen 10
link/[280]
6: eth2: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq qlen 1000
link/ether 06:c9:65:74:e6:88 brd ff:ff:ff:ff:ff:ff
root@am64xx-evm:~#
root@am64xx-evm:~#
root@am64xx-evm:~# ifconfig eth0 192.168.10.2 up
ifconfig: SIOCSIFFLAGS: No such device

Hi Randolph 

we need to access the gpio pins like GPIO0_8(P20),GPIO0_71(U11),GPIO0_72(V15),GPIO0_79(AA11),GPIO0_84(V12),GPIO1_17(U1),GPIO1_39(R2) ,need to toggle these pins for some cases,so we put device tree entry  for these pins,while changing in device tree already these pins are confgiured in other nodes, so we removed that.

The issue we are facing now,after made a changes in device tree we are able to toggle those pins,but 1G interface is not working

Can you please suggest some steps ?