Am 25.09.2015 um 00:11 schrieb Linus Walleij <linus.walleij@xxxxxxxxxx>: > On Wed, Sep 23, 2015 at 11:13 AM, H. Nikolaus Schaller > <hns@xxxxxxxxxxxxx> wrote: > >> 1. add a DT property to specify the list of GPIO pins that are to become >> "open drain" >> 2. if a pin is configured as "open drain", set value by either outputting a >> "0" (low level) or switching to input (high impedance) >> >> Tested on OMAP5 uEVM with TCA6424 and some LEDs connected to 5V. >> >> Signed-off-by: H. Nikolaus Schaller <hns@xxxxxxxxxxxxx> > > I understand the approach, but this is the wrong way to do it. > Instead of indicating that a pin on the pin controller should be > open drain, the *consumer* specifying its gpios = <....> should > do this. > > I just sent a patch adding the bindings because Tony Lindgren > and Grygorii Strashko approached me similar problems so let's > begin with the bindings. > > Implementing it in the kernel requires some elaboration and it's > going to be more complicated than this local approach, but it > will be more generic and reusable so that is what we need to do. Ok, I understand. Should not be too difficult to modify the driver. BR, Nikolaus Schaller -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
