Hi Robert,
I apologize for having misunderstood your directions.
I found the controller declaration and attached as a child the gpio hog as
follow:
gpio@44e07000 {
compatible = "ti,omap4-gpio";
ti,hwmods = "gpio1";
gpio-controller;
#gpio-cells = <0x2>;
interrupt-controller;
#interrupt-cells = <0x2>;
reg = <0x44e07000 0x1000>;
interrupts = <0x60>;
gpio-line-names = "MDIO_DATA", "MDIO_CLK", "SPI0_SCLK", "SPI0_D0",
"SPI0_D1", "SPI0_CS0", "SPI0_CS1", "ECAP0_IN_PWM0_OUT", "LCD_DATA12",
"LCD_DATA13", "LCD_DATA14", "LCD_DATA15", "UART1_CTSN", "UART1_RTSN",
"UART1_RXD", "UART1_TXD", "GMII1_TXD3", "GMII1_TXD2", "USB0_DRVVBUS",
"XDMA_EVENT_INTR0", "XDMA_EVENT_INTR1", "GMII1_TXD1", "GPMC_AD8",
"GPMC_AD9", "NC", "NC", "GPMC_AD10", "GPMC_AD11", "GMII1_TXD0",
"RMII1_REFCLK", "GPMC_WAIT0", "GPMC_WPN";
linux,phandle = <0x32>;
phandle = <0x32>;
};
P9_11 {
gpio-hog;
gpios = <11 GPIO_ACTIVE_LOW>;
output-low;
};
I am not sure about the value of 'gpios'.
I read that: "gpios: Store the GPIO information (id, flags, ...). Shall
contain the number of cells specified in its parent node (GPIO controller
node)".
In this case the parent node contains: "#gpio-cells = <0x2>;", but I have
no idea what to write in.
Il giorno giovedì 27 febbraio 2020 17:24:42 UTC+1, RobertCNelson ha scritto:
>
> On Thu, Feb 27, 2020 at 10:20 AM Fabrizio Borrello
> <[email protected] <javascript:>> wrote:
> >
> > Hi Robert, thank you for the fast reply.
> >
> > I hade :
> >
> > P9_11 {
> > gpio-name = "P9_11";
> > gpio = <0x35 0x1e 0x0>;
> > output;
> > dir-changeable;
> > }
> >
> > Following your directions I modify the initial code as follow:
> >
> > P9_11 {
> > gpio-hog;
> > gpios = <11 GPIO_ACTIVE_HIGH>;
> > output-low;
> > gpio-name = "P9_11";
> > gpio = <0x35 0x1e 0x0>;
> > dir-changeable;
> > };
> >
> > Is now correct?
>
> No, you can't combine those two..
>
> If all you need is to set the logic level on startup, use gpio-hog..
>
> Regards,
>
> --
> Robert Nelson
> https://rcn-ee.com/
>
--
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