On Tuesday 23 June 2015 04:25 PM, Vaibhav Hiremath wrote:
Hi,
+ linux-arm-kernel & MFD Thanks, Vaibhav
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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