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Date: Mon, 3 Feb 2020 14:37:49 +0000
From: Benjamin GAIGNARD <benjamin.gaignard@...com>
To: Rob Herring <robh@...nel.org>
CC: "wg@...ndegger.com" <wg@...ndegger.com>,
"mkl@...gutronix.de" <mkl@...gutronix.de>,
"davem@...emloft.net" <davem@...emloft.net>,
"mark.rutland@....com" <mark.rutland@....com>,
"sriram.dash@...sung.com" <sriram.dash@...sung.com>,
"linux-can@...r.kernel.org" <linux-can@...r.kernel.org>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] dt-bindings: net: can: Convert M_CAN to json-schema
On 2/3/20 3:26 PM, Rob Herring wrote:
> On Fri, Jan 24, 2020 at 04:55:42PM +0100, Benjamin Gaignard wrote:
>> Convert M_CAN bindings to json-schema
>>
>> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...com>
>> ---
>> .../bindings/net/can/can-transceiver.txt | 24 ----
>> .../devicetree/bindings/net/can/m_can.txt | 75 ----------
>> .../devicetree/bindings/net/can/m_can.yaml | 151 +++++++++++++++++++++
>> 3 files changed, 151 insertions(+), 99 deletions(-)
>> delete mode 100644 Documentation/devicetree/bindings/net/can/can-transceiver.txt
> No chance other controllers aren't going to have a transceiver?
They could ... I made a short cut since bosh,m_can was the only one
referencing this property and the file.
I will fit that in v2. Same for the comments you have done below.
Thanks,
Benjamin
>
>> delete mode 100644 Documentation/devicetree/bindings/net/can/m_can.txt
>> create mode 100644 Documentation/devicetree/bindings/net/can/m_can.yaml
> bosch,m_can.yaml
>
>> diff --git a/Documentation/devicetree/bindings/net/can/m_can.yaml b/Documentation/devicetree/bindings/net/can/m_can.yaml
>> new file mode 100644
>> index 000000000000..efdbed81af29
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/net/can/m_can.yaml
>> @@ -0,0 +1,151 @@
>> +# SPDX-License-Identifier: GPL-2.0
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/net/can/m_can.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Bosch MCAN controller Bindings
>> +
>> +description: Bosch MCAN controller for CAN bus
>> +
>> +maintainers:
>> + - Sriram Dash <sriram.dash@...sung.com>
>> +
>> +properties:
>> + compatible:
>> + const: bosch,m_can
>> +
>> + reg:
>> + items:
>> + - description: M_CAN registers map
>> + - description: message RAM
>> +
>> + reg-names:
>> + items:
>> + - const: m_can
>> + - const: message_ram
>> +
>> + interrupts:
>> + items:
>> + - description: interrupt line0
>> + - description: interrupt line1
>> + minItems: 1
>> + maxItems: 2
>> +
>> + interrupt-names:
>> + items:
>> + - const: int0
>> + - const: int1
>> + minItems: 1
>> + maxItems: 2
>> +
>> + clocks:
>> + items:
>> + - description: peripheral clock
>> + - description: bus clock
>> +
>> + clock-names:
>> + items:
>> + - const: hclk
>> + - const: cclk
>> +
>> + bosch,mram-cfg:
>> + description: |
>> + Message RAM configuration data.
>> + Multiple M_CAN instances can share the same Message RAM
>> + and each element(e.g Rx FIFO or Tx Buffer and etc) number
>> + in Message RAM is also configurable, so this property is
>> + telling driver how the shared or private Message RAM are
>> + used by this M_CAN controller.
>> +
>> + The format should be as follows:
>> + <offset sidf_elems xidf_elems rxf0_elems rxf1_elems rxb_elems txe_elems txb_elems>
>> + The 'offset' is an address offset of the Message RAM where
>> + the following elements start from. This is usually set to
>> + 0x0 if you're using a private Message RAM. The remain cells
>> + are used to specify how many elements are used for each FIFO/Buffer.
>> +
>> + M_CAN includes the following elements according to user manual:
>> + 11-bit Filter 0-128 elements / 0-128 words
>> + 29-bit Filter 0-64 elements / 0-128 words
>> + Rx FIFO 0 0-64 elements / 0-1152 words
>> + Rx FIFO 1 0-64 elements / 0-1152 words
>> + Rx Buffers 0-64 elements / 0-1152 words
>> + Tx Event FIFO 0-32 elements / 0-64 words
>> + Tx Buffers 0-32 elements / 0-576 words
>> +
>> + Please refer to 2.4.1 Message RAM Configuration in Bosch
>> + M_CAN user manual for details.
>> + allOf:
>> + - $ref: /schemas/types.yaml#/definitions/int32-matrix
> Looks like uint32-array based on the constraints.
>
>> + - items:
>> + items:
>> + - description: The 'offset' is an address offset of the Message RAM
>> + where the following elements start from. This is usually
>> + set to 0x0 if you're using a private Message RAM.
>> + default: 0
>> + - description: 11-bit Filter 0-128 elements / 0-128 words
>> + minimum: 0
>> + maximum: 128
>> + - description: 29-bit Filter 0-64 elements / 0-128 words
>> + minimum: 0
>> + maximum: 64
>> + - description: Rx FIFO 0 0-64 elements / 0-1152 words
>> + minimum: 0
>> + maximum: 64
>> + - description: Rx FIFO 1 0-64 elements / 0-1152 words
>> + minimum: 0
>> + maximum: 64
>> + - description: Rx Buffers 0-64 elements / 0-1152 words
>> + minimum: 0
>> + maximum: 64
>> + - description: Tx Event FIFO 0-32 elements / 0-64 words
>> + minimum: 0
>> + maximum: 32
>> + - description: Tx Buffers 0-32 elements / 0-576 words
>> + minimum: 0
>> + maximum: 32
>> + maxItems: 1
>> +
>> + can-transceiver:
>> + type: object
>> +
>> + properties:
>> + max-bitrate:
>> + $ref: /schemas/types.yaml#/definitions/uint32
>> + description: a positive non 0 value that determines the max speed that
>> + CAN/CAN-FD can run.
>> + minimum: 1
>> +
>> +required:
>> + - compatible
>> + - reg
>> + - reg-names
>> + - interrupts
>> + - interrupt-names
>> + - clocks
>> + - clock-names
>> + - bosch,mram-cfg
>> +
>> +additionalProperties: false
>> +
>> +examples:
>> + - |
>> + #include <dt-bindings/clock/imx6sx-clock.h>
>> + can@...8000 {
>> + compatible = "bosch,m_can";
>> + reg = <0x020e8000 0x4000>, <0x02298000 0x4000>;
>> + reg-names = "m_can", "message_ram";
>> + interrupts = <0 114 0x04>, <0 114 0x04>;
>> + interrupt-names = "int0", "int1";
>> + clocks = <&clks IMX6SX_CLK_CANFD>,
>> + <&clks IMX6SX_CLK_CANFD>;
>> + clock-names = "hclk", "cclk";
>> + bosch,mram-cfg = <0x0 0 0 32 0 0 0 1>;
>> +
>> + can-transceiver {
>> + max-bitrate = <5000000>;
>> + };
>> + };
>> +
>> +...
>> --
>> 2.15.0
>>
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