Re: [PATCH] arm64: dts: qcom: sc7180: Avoid glitching SPI CS at bootup on trogdor

Quoting Douglas Anderson (2021-02-18 14:55:09) > At boot time the following happens: > 1. Device core gets ready to probe our SPI driver. > 2. Device core applies SPI controller's "default" pinctrl. > 3. Device core calls the SPI driver's probe() function which will >eventually setup the chip s

Re: [PATCH] arm64: dts: qcom: sc7180: Avoid glitching SPI CS at bootup on trogdor

Hi, On Thu, Feb 18, 2021 at 2:55 PM Douglas Anderson wrote: > > it's believed > that, under certain timing conditions, it could be getting the EC into > a confused state causing the EC driver to fail to probe. Believed => confirmed I _think_ is public

[PATCH] arm64: dts: qcom: sc7180: Avoid glitching SPI CS at bootup on trogdor

At boot time the following happens: 1. Device core gets ready to probe our SPI driver. 2. Device core applies SPI controller's "default" pinctrl. 3. Device core calls the SPI driver's probe() function which will eventually setup the chip select GPIO as "unasserted". Thinking about the above, we