Re: [PATCH] gpio: mcp23s08: Add option to configure pullups.
From: Linus Walleij <hidden>
Date: 2016-10-24 00:53:34
Also in:
linux-gpio, lkml
From: Linus Walleij <hidden>
Date: 2016-10-24 00:53:34
Also in:
linux-gpio, lkml
On Fri, Oct 21, 2016 at 5:00 PM, Enric Balletbo i Serra [off-list ref] wrote:
Default is without pullups, but if property is specified in DT and the bit is set, set a pullup on GPIO-n. Signed-off-by: Enric Balletbo i Serra <redacted>
I don't generally like this. In device tree it is the consumer that specifies how the line is used, not the producer (gpiochip). We currently only specify polarity, open drain and open source for consumers though. And the entire pin control system came into being *exactly* because Grant didn't like me adding these things to the GPIO drivers. So how many other things does the MCP support? Drive strength? Schmitt trigger? Is there a datasheet? Yours, Linus Walleij