Messages in this thread | | | Date | Tue, 23 Jun 2015 16:25:40 +0530 | From | Vaibhav Hiremath <> | Subject | Use of pinctrl-single for external device over I2C |
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Hi,
I am working on enabling support for PMIC 88PM860 device in the mainline.
In 88PM860 (and family of devices) few pins are labelled as GPIO's, to be precise, in 88PM860, we have 8 GPIO's (ana & dig).
I was looking at pinctrl-single driver, as it seems it can not handle pinmux configuration of external device (in this case its over I2C), as it uses raw read/write api's.
I see below lines in the driver,
/* * REVISIT: Reads and writes could eventually use regmap or something * generic. But at least on omaps, some mux registers are performance * critical as they may need to be remuxed every time before and after * idle. Adding tests for register access width for every read and * write like regmap is doing is not desired, and caching the registers * does not help in this case. */
Should be not have flag for this and use regmap_ variants? If we implement flag based approach then same driver can be reused for pinmux configuration of external device.
Just to give more clarity, Let me describe my use-case below,
The platform which I have is based on PXA1928 and 88PM860 chipsets, where 88PM860.GPIO_0 is connected back to PXA1928.EXT_32K_IN.
GPIO_0 need to configured in mode '4'.
As per spec, 88PM860.GPIO_0 can be configured to
000 = GPIO input mode 001 = GPIO output mode 010 = SLEEPOUTN mirror mode 011 = Buck4 FPWM enable 100 = 32 Khz output buffer mode 101 = PMICINTN output mode 110 = HW_RESET1 mode 111 = HW_RESET2 mode
Please let me know if there is already an alternative for this, which I missed.
Thanks, Vaibhav
Thanks, Vaibhav
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