netdev - Re: [PATCH v4 3/5] net: ethernet: cpsw: introduce ti,am3352-cpsw compatible string

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Message-ID: <521791C1.2060803@ti.com>
Date:	Fri, 23 Aug 2013 22:15:53 +0530
From:	Mugunthan V N <mugunthanvnm@...com>
To:	Santosh Shilimkar <santosh.shilimkar@...com>
CC:	Daniel Mack <zonque@...il.com>, <netdev@...r.kernel.org>,
	<bcousson@...libre.com>, <nsekhar@...com>,
	<sergei.shtylyov@...entembedded.com>, <davem@...emloft.net>,
	<ujhelyi.m@...il.com>, <vaibhav.bedia@...com>, <d-gerlach@...com>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-omap@...r.kernel.org>, <devicetree@...r.kernel.org>
Subject: Re: [PATCH v4 3/5] net: ethernet: cpsw: introduce ti,am3352-cpsw
 compatible string

On Friday 23 August 2013 07:53 PM, Santosh Shilimkar wrote:
> On Friday 23 August 2013 10:16 AM, Daniel Mack wrote:
>> In order to support features that are specific to the AM335x IP, we have
>> to add hardware types and another compatible string.
>>
>> Signed-off-by: Daniel Mack <zonque@...il.com>
>> ---
>>  Documentation/devicetree/bindings/net/cpsw.txt |  3 ++-
>>  drivers/net/ethernet/ti/cpsw.c                 | 32 ++++++++++++++++++++------
>>  drivers/net/ethernet/ti/cpsw.h                 |  1 +
>>  3 files changed, 28 insertions(+), 8 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/net/cpsw.txt b/Documentation/devicetree/bindings/net/cpsw.txt
>> index 4e5ca54..b717458 100644
>> --- a/Documentation/devicetree/bindings/net/cpsw.txt
>> +++ b/Documentation/devicetree/bindings/net/cpsw.txt
>> @@ -2,7 +2,8 @@ TI SoC Ethernet Switch Controller Device Tree Bindings
>>  ------------------------------------------------------
>>  
>>  Required properties:
>> -- compatible		: Should be "ti,cpsw"
>> +- compatible		: Should be "ti,cpsw" for generic cpsw support, or
>> +			  "ti,am3352-cpsw" for AM3352 SoCs
>>  - reg			: physical base address and size of the cpsw
>>  			  registers map.
>>  			  An optional third memory region can be supplied if
>> diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c
>> index 7a25ff4..73c44cb6 100644
>> --- a/drivers/net/ethernet/ti/cpsw.c
>> +++ b/drivers/net/ethernet/ti/cpsw.c
>> @@ -155,6 +155,11 @@ do {								\
>>  		((priv->data.dual_emac) ? priv->emac_port :	\
>>  		priv->data.active_slave)
>>  
>> +enum {
>> +	CPSW_TYPE_GENERIC,
>> +	CPSW_TYPE_AM33XX
>> +};
>> +
>>  static int debug_level;
>>  module_param(debug_level, int, 0);
>>  MODULE_PARM_DESC(debug_level, "cpsw debug level (NETIF_MSG bits)");
>> @@ -1692,17 +1697,36 @@ static void cpsw_slave_init(struct cpsw_slave *slave, struct cpsw_priv *priv,
>>  	slave->port_vlan = data->dual_emac_res_vlan;
>>  }
>>  
>> +static const struct of_device_id cpsw_of_mtable[] = {
>> +	{
>> +		.compatible	= "ti,am3352-cpsw",
> I didn't notice this earlier, but can't you use the IP version
> as a compatible instead of using a SOC name. Whats really SOC specific
> on this IP ? Sorry i have missed any earlier discussion on this but
> this approach doesn't seem good. Its like adding SOC checks in the
> driver subsystem.
>
>
But the same IP can be used in different SoC as well where the control
register may be different as per the Silicon Integration team's decision?

Ideally there should be a separate control module driver so that it can
take care of different SoC related needs.

Regards
Mugunthan V N
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