lkml.org 
[lkml]   [2018]   [Mar]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [PATCH v3 11/11] dt-bindings: gpio: Add bindings for Cadence I3C gpio expander
    On Fri, Mar 23, 2018 at 12:00:20PM +0100, Boris Brezillon wrote:
    > Document the Cadence I3C gpio expander bindings.
    >
    > Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
    > ---
    > .../devicetree/bindings/gpio/gpio-cdns-i3c.txt | 38 ++++++++++++++++++++++
    > 1 file changed, 38 insertions(+)
    > create mode 100644 Documentation/devicetree/bindings/gpio/gpio-cdns-i3c.txt
    >
    > diff --git a/Documentation/devicetree/bindings/gpio/gpio-cdns-i3c.txt b/Documentation/devicetree/bindings/gpio/gpio-cdns-i3c.txt
    > new file mode 100644
    > index 000000000000..634b1f268215
    > --- /dev/null
    > +++ b/Documentation/devicetree/bindings/gpio/gpio-cdns-i3c.txt
    > @@ -0,0 +1,38 @@
    > +* Cadence I3C GPIO expander
    > +
    > +The Cadence I3C GPIO expander provides 8 GPIOs controllable over I3C.
    > +This GPIOs can be configured in output or input mode and if they are in input
    > +mode they can generate IBIs (In Band Interrupts).
    > +
    > +Required properties for GPIO node:
    > +- reg : 3 cells encoding the I3C static address (none in our case) and the I3C
    > + Provisional ID. See Documentation/devicetree/bindings/i3c/i3c.txt for
    > + more details.
    > + Should be <0x0 0x392 0x0>.
    > +- gpio-controller : Marks the device node as a gpio controller.
    > +- #gpio-cells : Should be two. The first cell is the pin number and
    > + the second cell is used to specify the gpio polarity:
    > + 0 = active high
    > + 1 = active low
    > +- interrupt-controller: Marks the device node as an interrupt controller.
    > +- #interrupt-cells : Should be 2. The first cell is the GPIO number.
    > + The second cell bits[3:0] is used to specify trigger type and level flags:
    > + 1 = low-to-high edge triggered.
    > + 2 = high-to-low edge triggered.
    > + 3 = triggered on both edges.
    > + 4 = active high level-sensitive.
    > + 8 = active low level-sensitive.
    > +
    > +Example:
    > +
    > + i3c-master@xxx {
    > + ...
    > + i3c_gpio_expander: gpio@0,1c9,0 {

    The unit address is wrong here.

    > + reg = <0 0x392 0x0>;
    > + gpio-controller;
    > + #gpio-cells = <2>;
    > + interrupt-controller;
    > + #interrupt-cells = <2>;
    > + };
    > + ...
    > + };
    > --
    > 2.14.1
    >

    \
     
     \ /
      Last update: 2018-03-27 00:29    [W:3.753 / U:0.156 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site