On 08/25/2013 11:35 PM, Xiubo Li-B47053 wrote: >> Subject: Re: [PATCH 4/4] Documentation: Add device tree bindings for ... >>> Why do you need to manipulate the pinctrl to en/disable a channel? >> >> This is because in Vybrid VF610 TOWER board, there are 4 leds, and each >> led's one point(diode's positive pole) is connected to 3.3V, and the >> other point is connected to pwm's one channel. When the 4 pinctrls are >> configured as enable at the same time, the 4 pinctrls is low valtage, and >> the 4 leds will be lighted up as default, then when you enable/disable >> one led will effects others. >> >> These pinctrls are belong to pwm, and I don't think led or other customer >> could control them directly. >> So, here I authorize the 4 pinctrls to each channel controls. >> > " > For the reason above, I have to control the pinctrls separately. > > If all the pinctrls set as default state, the 8 pinctrls must be controlled together. > And the 4 leds will all be lighted up as default and will influence each other. Sorry, that still doesn't make much sense. Either way though, having separate pinctrl setup for a single device isn't going to work. You'll either need to have all combinations of 4 (8?) PWMs represented as pinctrl states(!), or register separate PWM devices so that they get independant pinctrl states. -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
