[lkml]   [2019]   [Dec]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH v3 4/7] dt-bindings: gpio: Add gpio-repeater bindings
Hi Rob,

On Thu, Dec 5, 2019 at 10:06 PM Rob Herring <> wrote:
> On Wed, Nov 27, 2019 at 09:42:50AM +0100, Geert Uytterhoeven wrote:
> > Add Device Tree bindings for a GPIO repeater, with optional translation
> > of physical signal properties. This is useful for describing explicitly
> > the presence of e.g. an inverter on a GPIO line, and was inspired by the
> > non-YAML gpio-inverter bindings by Harish Jenny K N
> > <>[1].
> >
> > Note that this is different from a GPIO Nexus Node[2], which cannot do
> > physical signal property translation.
> It can't? Why not? The point of the passthru mask is to not do
> translation of flags, but without it you are always doing translation of
> cells.

Thanks for pushing me deeper into nexuses!
You're right, you can map from one type to another.
However, you cannot handle the "double inversion" of an ACTIVE_LOW
signal with a physical inverter added:

nexus: led-nexus {
#gpio-cells = <2>;
gpio-map = <0 0 &gpio2 19 GPIO_ACTIVE_LOW>, // inverted
<1 0 &gpio2 20 GPIO_ACTIVE_HIGH>, // noninverted
<2 0 &gpio2 21 GPIO_ACTIVE_LOW>; // inverted
gpio-map-mask = <3 0>;
// default gpio-map-pass-thru = <0 0>;

leds {
compatible = "gpio-leds";
led6-inverted {
gpios = <&nexus 0 GPIO_ACTIVE_HIGH>;
led7-noninverted {
gpios = <&nexus 1 GPIO_ACTIVE_HIGH>;
led8-double-inverted { // FAILS: still inverted
gpios = <&nexus 2 GPIO_ACTIVE_LOW>;

It "works" if the last entry in gpio-map is changed to GPIO_ACTIVE_HIGH.
Still, the consumer would see the final translated polarity, and not the
actual one it needs to program the consumer for.

> > While an inverter can be described implicitly by exchanging the
> > GPIO_ACTIVE_HIGH and GPIO_ACTIVE_LOW flags, this has its limitations.
> > Each GPIO line has only a single GPIO_ACTIVE_* flag, but applies to both
> > th provider and consumer sides:
> > 1. The GPIO provider (controller) looks at the flags to know the
> > polarity, so it can translate between logical (active/not active)
> > and physical (high/low) signal levels.
> > 2. While the signal polarity is usually fixed on the GPIO consumer
> > side (e.g. an LED is tied to either the supply voltage or GND),
> > it may be configurable on some devices, and both sides need to
> > agree. Hence the GPIO_ACTIVE_* flag as seen by the consumer must
> > match the actual polarity.
> > There exists a similar issue with interrupt flags, where both the
> > interrupt controller and the device generating the interrupt need
> > to agree, which breaks in the presence of a physical inverter not
> > described in DT (see e.g. [3]).
> Adding an inverted flag as I've suggested would also solve this issue.

As per your suggestion in "Re: [PATCH V4 2/2] gpio: inverter: document
the inverter bindings"?

Oh, now I understand. I was misguided by Harish' interpretation
which assumed an "inverted" property, e.g.

inverted = /bits/ 8 <0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0>;

But you actually meant a new GPIO_INVERTED flag, to be ORed into the 2nd
cell of a GPIO specifier? I.e. add to include/dt-bindings/gpio/gpio.h"

/* Bit 6 expresses the presence of a physical inverter */
#define GPIO_INVERTED 64

We need to be very careful in defining to which side the GPIO_ACTIVE_*
applies to (consumer?), and which side the GPIO_INVERTED flag (provider?).
Still, this doesn't help if e.g. a FET is used instead of a push-pull
inverter, as the former needs translation of other flags (which the
nexus can do, the caveats above still applies, though).

Same for adding IRQ_TYPE_INVERTED.

Related issue: how to handle physical inverters on SPI chip select lines,
if the SPI slave can be configured for both polarities?



Geert Uytterhoeven -- There's lots of Linux beyond ia32 --

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds

 \ /
  Last update: 2019-12-06 10:18    [W:0.095 / U:8.940 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site