linux-kernel - Re: [PATCH v2 3/6] dt-bindings: phy: Add binding for TI TCAN104x CAN transceivers

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Message-ID: <9a9a3b8b-f345-faae-b9bc-3961518e3d29@ti.com>
Date:   Thu, 15 Apr 2021 11:57:20 +0530
From:   Aswath Govindraju <a-govindraju@...com>
To:     Marc Kleine-Budde <mkl@...gutronix.de>
CC:     <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-phy@...ts.infradead.org>,
        Chandrasekar Ramakrishnan <rcsekar@...sung.com>,
        Wolfgang Grandegger <wg@...ndegger.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>, <linux-can@...r.kernel.org>,
        <netdev@...r.kernel.org>, Vignesh Raghavendra <vigneshr@...com>,
        Lokesh Vutla <lokeshvutla@...com>,
        Grygorii Strashko <grygorii.strashko@...com>
Subject: Re: [PATCH v2 3/6] dt-bindings: phy: Add binding for TI TCAN104x CAN
 transceivers

Hi Marc,

On 14/04/21 9:03 pm, Marc Kleine-Budde wrote:
> On 14.04.2021 19:35:18, Aswath Govindraju wrote:
>> Add binding documentation for TI TCAN104x CAN transceivers.
>>
>> Signed-off-by: Aswath Govindraju <a-govindraju@...com>
>> ---
>>  .../bindings/phy/ti,tcan104x-can.yaml         | 56 +++++++++++++++++++
>>  MAINTAINERS                                   |  1 +
>>  2 files changed, 57 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/phy/ti,tcan104x-can.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/phy/ti,tcan104x-can.yaml b/Documentation/devicetree/bindings/phy/ti,tcan104x-can.yaml
>> new file mode 100644
>> index 000000000000..4abfc30a97d0
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/phy/ti,tcan104x-can.yaml
>> @@ -0,0 +1,56 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: "http://devicetree.org/schemas/phy/ti,tcan104x-can.yaml#"
>> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
>> +
>> +title: TCAN104x CAN TRANSCEIVER PHY
>> +
>> +maintainers:
>> +  - Aswath Govindraju <a-govindraju@...com>
>> +
>> +properties:
>> +  $nodename:
>> +    pattern: "^tcan104x-phy"
>> +
>> +  compatible:
>> +    enum:
>> +      - ti,tcan1042
>> +      - ti,tcan1043
> 
> Can you ensure that the 1042 has only the standby gpio and the 1043 has both?
> 

In the driver, it is the way the flags have been set for ti,tcan1042 and
ti,tcan1043.

>> +
>> +  '#phy-cells':
>> +    const: 0
>> +
>> +  standby-gpios:
>> +    description:
>> +      gpio node to toggle standby signal on transceiver
>> +    maxItems: 1
>> +
>> +  enable-gpios:
>> +    description:
>> +      gpio node to toggle enable signal on transceiver
>> +    maxItems: 1
>> +
>> +  max-bitrate:
>> +    $ref: /schemas/types.yaml#/definitions/uint32
>> +    description:
>> +      max bit rate supported in bps
>> +    minimum: 1
>> +
>> +required:
>> +  - compatible
>> +  - '#phy-cells'
>> +
>> +additionalProperties: false
>> +
>> +examples:
>> +  - |
>> +    #include <dt-bindings/gpio/gpio.h>
>> +
>> +    transceiver1: tcan104x-phy {
>> +      compatible = "ti,tcan1043";
>> +      #phy-cells = <0>;
>> +      max-bitrate = <5000000>;
>> +      standby-gpios = <&wakeup_gpio1 16 GPIO_ACTIVE_LOW>;
>> +      enable-gpios = <&main_gpio1 67 GPIO_ACTIVE_LOW>;
> 
> AFAICS the enable gpio is active high.
> 

I will correct this in the respin.

Thanks,
Aswath

> Marc
>