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Date:   Sun, 31 May 2020 12:01:01 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Jonathan Albrieux <jonathan.albrieux@...il.com>
Cc:     linux-kernel@...r.kernel.org,
        ~postmarketos/upstreaming@...ts.sr.ht,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Rob Herring <robh+dt@...nel.org>,
        linux-iio@...r.kernel.org (open list:IIO SUBSYSTEM AND DRIVERS),
        devicetree@...r.kernel.org (open list:OPEN FIRMWARE AND FLATTENED
        DEVICE TREE BINDINGS)
Subject: Re: [PATCH v7 3/5] dt-bindings: iio: magnetometer: ak8975: add gpio
 reset support

On Thu, 28 May 2020 16:59:28 +0200
Jonathan Albrieux <jonathan.albrieux@...il.com> wrote:

> Add reset-gpio support.
> 
> Without reset's deassertion during ak8975_power_on(), driver's probe fails
> on ak8975_who_i_am() while checking for device identity for AK09911 chip.
> 
> AK09911 has an active low reset gpio to handle register's reset.
> AK09911 datasheet says that, if not used, reset pin should be connected
> to VID. This patch emulates this situation.
> 
> Signed-off-by: Jonathan Albrieux <jonathan.albrieux@...il.com>
> Reviewed-by: Rob Herring <robh@...nel.org>

Applied to the togreg branch of iio.git and pushed out as testing
for the autobuilders to play with it.

thanks,

Jonathan

> ---
>  .../bindings/iio/magnetometer/asahi-kasei,ak8975.yaml      | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/iio/magnetometer/asahi-kasei,ak8975.yaml b/Documentation/devicetree/bindings/iio/magnetometer/asahi-kasei,ak8975.yaml
> index 55b18784e503..e8af53d60759 100644
> --- a/Documentation/devicetree/bindings/iio/magnetometer/asahi-kasei,ak8975.yaml
> +++ b/Documentation/devicetree/bindings/iio/magnetometer/asahi-kasei,ak8975.yaml
> @@ -47,6 +47,11 @@ properties:
>    mount-matrix:
>      description: an optional 3x3 mounting rotation matrix.
>  
> +  reset-gpios:
> +    description: |
> +      an optional pin needed for AK09911 to set the reset state. This should
> +      be usually active low
> +
>  required:
>    - compatible
>    - reg
> @@ -54,6 +59,7 @@ required:
>  examples:
>    - |
>      #include <dt-bindings/interrupt-controller/irq.h>
> +    #include <dt-bindings/gpio/gpio.h>
>      i2c {
>          #address-cells = <1>;
>          #size-cells = <0>;
> @@ -64,6 +70,7 @@ examples:
>              interrupt-parent = <&gpio6>;
>              interrupts = <15 IRQ_TYPE_EDGE_RISING>;
>              vdd-supply = <&ldo_3v3_gnss>;
> +            reset-gpios = <&msmgpio 111 GPIO_ACTIVE_LOW>;
>              mount-matrix = "-0.984807753012208",  /* x0 */
>                             "0",                   /* y0 */
>                             "-0.173648177666930",  /* z0 */

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