[PATCH v2 resend] arm: dts: sun7i-a20-bananapi: name the GPIO lines
From: Maxime Ripard <hidden>
Date: 2017-05-04 14:56:57
Also in:
linux-devicetree
On Wed, May 03, 2017 at 09:09:20AM +0200, Oleksij Rempel wrote:
quoted hunk
This names the GPIO lines on the Banana Pi board in accordance with the A20_Banana_Pi v1.4 Specification. This will make these line names reflect through to userspace so that they can easily be identified and used with the new character device ABI. Some care has been taken to name all lines, not just those used by the external connectors, also lines that are muxed into some other function than GPIO: these are named "[FOO]" so that users can see with lsgpio what all lines are used for. Signed-off-by: Oleksij Rempel <redacted> Acked-by: Linus Walleij <redacted> Cc: devicetree at vger.kernel.org Cc: linux-arm-kernel at lists.infradead.org Cc: Chen-Yu Tsai <redacted> Cc: Maxime Ripard <redacted> --- arch/arm/boot/dts/sun7i-a20-bananapi.dts | 60 ++++++++++++++++++++++++++++++++ 1 file changed, 60 insertions(+)diff --git a/arch/arm/boot/dts/sun7i-a20-bananapi.dts b/arch/arm/boot/dts/sun7i-a20-bananapi.dts index 91f2e5f..5b3e0ee 100644 --- a/arch/arm/boot/dts/sun7i-a20-bananapi.dts +++ b/arch/arm/boot/dts/sun7i-a20-bananapi.dts@@ -178,6 +178,66 @@ }; &pio { + /* + * Legend: proper name = the GPIO line is used as GPIO
I'm not convinced that a legend here is helpful in any way. No end user is going to even search for it here.
+ * NC = not connected (not routed from the SoC)
Judging from the binding documentation, this should be the same than "".
+ * "[PER]" = pin is muxed for peripheral (not GPIO)
We don't need the brackets. You have no guarantee that it is actually muxed, and will need to get that info from somewhere else either way. This is also not a syntax that is in the generic binding definition.
+ * "" = no idea, schematic doesn't say, could be + * unrouted (not connected to any external pin) + * LSEC = Low Speed External Connector + * HSEC = High Speed External Connector
And both of those are not used. Maxime -- Maxime Ripard, Free Electrons Embedded Linux and Kernel engineering http://free-electrons.com -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 801 bytes Desc: not available URL: <http://lists.infradead.org/pipermail/linux-arm-kernel/attachments/20170504/86a6ce79/attachment.sig>