Other Parts Discussed in Thread: OMAPL138,
Tool/software: Linux
Hi,
SDK: PROCESSOR-SDK-LINUX-OMAPL138 05_00_00_15
I want to set the GP0[9] to "gpio-keys", and I have add the code in the da850-lcdk.dts like this:
//20180907
user3 {
label = "GPIO Key USER2";
linux,code = <BTN_2>;
gpios = <&gpio 9 GPIO_ACTIVE_HIGH>;
};
But the Linux can't work well, Just stop during the startup process.
and I have read the topic about the GPIO: http://processors.wiki.ti.com/index.php/DaVinci_PSP_03.01_Linux_Installation_User_Guide
GPIO
GPIO driver has been rewritten to use the GPIO core infrastructure from the kernel. However there are no major changes to the APIs (back-end communication with the interrupts are handled with GPIO core).
Need to call gpio_request() to start using a GPIO (this was not required earlier, we could directly call gpio_direction_xxx and gpio_write APIs)
Provision to pass falling edge or rising edge information with the request_irq API. The IORESOURCE_IRQ_LOWEDGE and/or IORESOURCE_IRQ_HIGHEDGE can be passed for the "flags" argument.
Current driver (for DM355 only) has a limitation of using GPIO 0-9 direct/unbanked interrupts together with the banked interrupts. The default behavior of the driver is use banked interrupts for all GPIOs (including GPIO 0-9). In this case all GPIO interrupts work, provided they are available through pinmux. The DM355 SoC file - arch/arm/mach-davinci/dm355.c file can be configured to enable direct/unbanked interrupts for GPIO 0-9. However, with this change GPIO 10 - 103 in interrupt mode (through banked interrupts) would not work.
@@ -865,11 +865,12 @@ static struct davinci_soc_info davinci_soc_info_dm355 = {
.intc_irq_prios = dm355_default_priorities,
.intc_irq_num = DAVINCI_N_AINTC_IRQ,
.timer_info = &dm355_timer_info,
.gpio_base = IO_ADDRESS(DAVINCI_GPIO_BASE),
.gpio_num = 104,
- .gpio_irq = IRQ_DM355_GPIOBNK0,
+ .gpio_irq = IRQ_DM355_GPIO0,
+ .gpio_unbanked = 10,
.serial_dev = &dm355_serial_device,
.sram_dma = 0x00010000,
.sram_len = SZ_32K,
};
I also change the da850.dtsi:
gpio: gpio@226000 {
compatible = "ti,dm6441-gpio";
gpio-controller;
#gpio-cells = <2>;
reg = <0x226000 0x1000>;
interrupts = <42 IRQ_TYPE_EDGE_BOTH
43 IRQ_TYPE_EDGE_BOTH 44 IRQ_TYPE_EDGE_BOTH
45 IRQ_TYPE_EDGE_BOTH 46 IRQ_TYPE_EDGE_BOTH
47 IRQ_TYPE_EDGE_BOTH 48 IRQ_TYPE_EDGE_BOTH
49 IRQ_TYPE_EDGE_BOTH 50 IRQ_TYPE_EDGE_BOTH>;
ti,ngpio = <144>;
ti,davinci-gpio-unbanked = <0>; //20180907
status = "disabled";
};
to
ti,davinci-gpio-unbanked = <8>; //20180907
But the Linux doesn't work as I want, I can not see the GPIO0_9 when I use the tool "lsgpio".
so I want someone help me to set the gpio0_9 as the "gpio-keys".
