Hi Nishant, Thank you very much for your suggestions! Now I understand how it works...(I hope) :D
BUT, now I've checked the client->irq in an i2c driver and the value is still 0... What I have to check? Thanks, Denis On 12/11/2013 04:39 PM, menon.nisha...@gmail.com wrote: > On Wed, Dec 11, 2013 at 8:28 AM, Denis CIOCCA <denis.cio...@st.com> 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 majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
