netdev - Re: [PATCH v3 7/8] net: can: c_can: Add support for TI DRA7 DCAN

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Message-ID: <545A2679.2000905@pengutronix.de>
Date:	Wed, 05 Nov 2014 14:30:33 +0100
From:	Marc Kleine-Budde <mkl@...gutronix.de>
To:	Roger Quadros <rogerq@...com>, wg@...ndegger.com
CC:	wsa@...-dreams.de, tony@...mide.com, tglx@...utronix.de,
	mugunthanvnm@...com, george.cherian@...com, balbi@...com,
	nsekhar@...com, nm@...com, sergei.shtylyov@...entembedded.com,
	linux-omap@...r.kernel.org, linux-can@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH v3 7/8] net: can: c_can: Add support for TI DRA7 DCAN

On 11/04/2014 11:21 AM, Roger Quadros wrote:
> DRA7 SoC has 2 CAN IPs. Provide compatible IDs and RAMINIT
> register data for both.

My understanding of the discussion with Wolfram was:
- We should put the number of the Interface into to DT as a regmap
  parameter.
- We put the method how to find the correct bits into the DT, via the
  compatible.

So for both CAN instances on the DRA7 we have a single compatible
"ti,dra7-d_can" and in the driver a mechanism that translates the number
of the instance into the needed bit offsets, e.g. via two arrays.

Same comments for patch 8/8.

Marc

> 
> Signed-off-by: Roger Quadros <rogerq@...com>
> ---
>  Documentation/devicetree/bindings/net/can/c_can.txt |  1 +
>  drivers/net/can/c_can/c_can_platform.c              | 16 ++++++++++++++++
>  2 files changed, 17 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/net/can/c_can.txt b/Documentation/devicetree/bindings/net/can/c_can.txt
> index 917ac0e..746cc07 100644
> --- a/Documentation/devicetree/bindings/net/can/c_can.txt
> +++ b/Documentation/devicetree/bindings/net/can/c_can.txt
> @@ -4,6 +4,7 @@ Bosch C_CAN/D_CAN controller Device Tree Bindings
>  Required properties:
>  - compatible		: Should be "bosch,c_can" for C_CAN controllers and
>  			  "bosch,d_can" for D_CAN controllers.
> +			  Can be "ti,dra7-d_can1" or "ti,dra7-d_can2".
>  - reg			: physical base address and size of the C_CAN/D_CAN
>  			  registers map
>  - interrupts		: property with a value describing the interrupt
> diff --git a/drivers/net/can/c_can/c_can_platform.c b/drivers/net/can/c_can/c_can_platform.c
> index d058820..dc618ce 100644
> --- a/drivers/net/can/c_can/c_can_platform.c
> +++ b/drivers/net/can/c_can/c_can_platform.c
> @@ -195,6 +195,20 @@ static struct c_can_driver_data d_can_drvdata = {
>  	.id = BOSCH_D_CAN,
>  };
>  
> +static struct c_can_driver_data dra7_dcan1_drvdata = {
> +	.id = BOSCH_D_CAN,
> +	.raminit_start_bit = 3,
> +	.raminit_done_bit = 1,
> +	.raminit_pulse = true,
> +};
> +
> +static struct c_can_driver_data dra7_dcan2_drvdata = {
> +	.id = BOSCH_D_CAN,
> +	.raminit_start_bit = 5,
> +	.raminit_done_bit = 2,
> +	.raminit_pulse = true,
> +};
> +
>  static struct platform_device_id c_can_id_table[] = {
>  	{
>  		.name = KBUILD_MODNAME,
> @@ -215,6 +229,8 @@ MODULE_DEVICE_TABLE(platform, c_can_id_table);
>  static const struct of_device_id c_can_of_table[] = {
>  	{ .compatible = "bosch,c_can", .data = &c_can_drvdata },
>  	{ .compatible = "bosch,d_can", .data = &d_can_drvdata },
> +	{ .compatible = "ti,dra7-d_can1", .data = &dra7_dcan1_drvdata },
> +	{ .compatible = "ti,dra7-d_can2", .data = &dra7_dcan2_drvdata },
>  	{ /* sentinel */ },
>  };
>  MODULE_DEVICE_TABLE(of, c_can_of_table);
> 


-- 
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