Messages in this thread | | | Date | Sun, 11 Jun 2017 08:19:19 +0200 | From | Oleksij Rempel <> | Subject | Re: [PATCH v1 1/1] gpio: of: provide option generic property for initial line states |
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Hi Rob,
On Fri, Jun 09, 2017 at 10:41:30AM -0500, Rob Herring wrote: > On Fri, Jun 9, 2017 at 9:16 AM, Oleksij Rempel <o.rempel@pengutronix.de> wrote: > > This property is needed for barebox or may be other bootloaders > > to set proper gpio configuration as early as possible. > > > > This example is mainly based on "lines-initial-states" property > > from this binding documentation: > > Documentation/devicetree/bindings/gpio/gpio-pcf857x.txt > > Don't we have a binding for this already based on gpio-hogs.
Markus Pargmann was working on this topic before and suddenly was not able to finish it. I found only some not finished discussions and no code or documentation in linux kernel upstream.
So far, I was able to find fallowing patches and discussions: patch 23.08.2015, last comment 11.05.2017: https://patchwork.kernel.org/patch/7096721/
patch 23.02.2016, last comment 09.03.2016: https://patchwork.ozlabs.org/patch/586743/
Since there was objections about node-like design for gpio-initval, I provided an array property, which is similar to initval properties already used for different other device nodes. For example:
Documentation/devicetree/bindings/net/wireless/qcom,ath10k.txt qcom,ath10k-calibration-data
Documentation/devicetree/bindings/gpio/gpio-pcf857x.txt lines-initial-states
Please fixme if I miss something.
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