On Wed, Dec 11, 2013 at 8:28 AM, Denis CIOCCA <denis.ciocca@xxxxxx> wrote: > Hi everybody, > > I'm trying to configure an IRQ on pandaboard using device tree but I'm > not able to understand how I can do it. > I want to configure the the gpio_139 pin and without device tree my > command was: > > OMAP4_MUX(MCSPI1_SIMO, OMAP_MUX_MODE3 | OMAP_PIN_INPUT_PULLUP), > > I need to associate it to a i2c device, declared in this way: here is how you'd figure it out in dt world ;) - it might be a little simpler or harder depending on which end of the development world one is from... (gmail might be screwing up my formatting a little.. so apologies before hand. http://pastebin.mozilla.org/3755622 is a copy if you need one.. anyways, step 1: from trm, you get to know that the pin is part of "core" "SYSCTRL_PADCONF_CORE" as it states for register instance in the trm. step 2: you compute the offset step 3: you define the pinctrl dt node step 4: you'd provide the device using it reference - rather trivial ;) diff --git a/arch/arm/boot/dts/omap4-panda-es.dts b/arch/arm/boot/dts/omap4-panda-es.dts index 56c4354..8f8d36c 100644 --- a/arch/arm/boot/dts/omap4-panda-es.dts +++ b/arch/arm/boot/dts/omap4-panda-es.dts @@ -41,6 +41,25 @@ 0xb6 (PIN_OUTPUT | MUX_MODE3) /* gpio_110 */ >; }; + + lsm303d_pins: lsm303d_pins { + pinctrl-single,pins = < + /* + * Example for 4460 device: + * from arch/arm/boot/dts/omap4.dtsi: + * omap4_pmx_core: reg = <0x4a100040 + * the base address --> ^^ + * + * Now, the offset is computed as following: + * Download TRM: http://www.ti.com/lit/ug/swpu235aa/swpu235aa.pdf + * Searching in TRM for MCSPI1_SIMO (page 4145), you see: + * 32 bit register 0x4a100134, it is on the higher 16 bits + * 0x4a100134(SOMI) + 2 (SIMO) = 0x4a100136 + * offset hence is = 0x4a100136 - 0x4a100040 = 0xF6 + */ + 0xF6 (PIN_INPUT_PULLUP | MUX_MODE3) /* mcspi1_somi.gpio_139 */ + >; + }; }; &led_wkgpio_pins { @@ -62,3 +81,16 @@ gpios = <&gpio1 8 GPIO_ACTIVE_HIGH>; }; }; +&i2c4 { + pinctrl-names = "default"; + pinctrl-0 = <&i2c4_pins>; + + clock-frequency = <400000>; + + lsm303d@03 { + pinctrl-names = "default"; + pinctrl-0 = <&lsm303d_pins>; + compatible = "st,lsm303d"; + reg = <0x03>; + }; +}; -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
