netdev - Re: [PATCH 1/2] net: dsa: b53: Add compatible strings for the Cygnus-family BCM11360.

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Message-ID: <173c8ff2-6a31-5460-9a3f-8d8ac445a336@gmail.com>
Date:   Mon, 24 Apr 2017 16:07:37 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Arun Parameswaran <arun.parameswaran@...adcom.com>,
        Eric Anholt <eric@...olt.net>,
        Vivien Didelot <vivien.didelot@...oirfairelinux.com>,
        Andrew Lunn <andrew@...n.ch>, netdev@...r.kernel.org,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>, devicetree@...r.kernel.org
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        bcm-kernel-feedback-list@...adcom.com, Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        Jon Mason <jonmason@...adcom.com>
Subject: Re: [PATCH 1/2] net: dsa: b53: Add compatible strings for the
 Cygnus-family BCM11360.

On 04/24/2017 04:03 PM, Arun Parameswaran wrote:
> Hi Eric
> 
> A comment on the Device ID.
> 
> 
> On 17-04-24 02:50 PM, Eric Anholt wrote:
>> Cygnus is a small family of SoCs, of which we currently have
>> devicetree for BCM11360 and BCM58300.  The 11360's B53 is mostly the
>> same as 58xx, just requiring a tiny bit of setup that was previously
>> missing.
>>
>> Signed-off-by: Eric Anholt <eric@...olt.net>
>> ---
>>  Documentation/devicetree/bindings/net/dsa/b53.txt | 3 +++
>>  drivers/net/dsa/b53/b53_srab.c                    | 2 ++
>>  2 files changed, 5 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/net/dsa/b53.txt b/Documentation/devicetree/bindings/net/dsa/b53.txt
>> index d6c6e41648d4..49c93d3c0839 100644
>> --- a/Documentation/devicetree/bindings/net/dsa/b53.txt
>> +++ b/Documentation/devicetree/bindings/net/dsa/b53.txt
>> @@ -29,6 +29,9 @@ Required properties:
>>        "brcm,bcm58625-srab"
>>        "brcm,bcm88312-srab" and the mandatory "brcm,nsp-srab string
>>  
>> +  For the BCM11360 SoC, must be:
>> +      "brcm,bcm11360-srab" and the mandatory "brcm,cygnus-srab string
>> +
>>    For the BCM63xx/33xx SoCs with an integrated switch, must be one of:
>>        "brcm,bcm3384-switch"
>>        "brcm,bcm6328-switch"
>> diff --git a/drivers/net/dsa/b53/b53_srab.c b/drivers/net/dsa/b53/b53_srab.c
>> index 8a62b6a69703..c37ffd1b6833 100644
>> --- a/drivers/net/dsa/b53/b53_srab.c
>> +++ b/drivers/net/dsa/b53/b53_srab.c
>> @@ -364,6 +364,7 @@ static const struct of_device_id b53_srab_of_match[] = {
>>  	{ .compatible = "brcm,bcm53018-srab" },
>>  	{ .compatible = "brcm,bcm53019-srab" },
>>  	{ .compatible = "brcm,bcm5301x-srab" },
>> +	{ .compatible = "brcm,bcm11360-srab", .data = (void *)BCM58XX_DEVICE_ID },
>>  	{ .compatible = "brcm,bcm58522-srab", .data = (void *)BCM58XX_DEVICE_ID },
>>  	{ .compatible = "brcm,bcm58525-srab", .data = (void *)BCM58XX_DEVICE_ID },
>>  	{ .compatible = "brcm,bcm58535-srab", .data = (void *)BCM58XX_DEVICE_ID },
>> @@ -371,6 +372,7 @@ static const struct of_device_id b53_srab_of_match[] = {
>>  	{ .compatible = "brcm,bcm58623-srab", .data = (void *)BCM58XX_DEVICE_ID },
>>  	{ .compatible = "brcm,bcm58625-srab", .data = (void *)BCM58XX_DEVICE_ID },
>>  	{ .compatible = "brcm,bcm88312-srab", .data = (void *)BCM58XX_DEVICE_ID },
>> +	{ .compatible = "brcm,cygnus-srab", .data = (void *)BCM58XX_DEVICE_ID },
> The device ID should be 0xd300. This is the actual value read from the switch regs.
> This also requires an entry in the 'b53_switch_chips' structure in b53_common.c.

These are not real ID numbers, these are values that indicate the
generation of the switch being embedded into the SoC. Within
b53_common.c we don't have to differentiate a Starfighter 2 embedded in
BCM11360, NSP, or 7445 or 7278, which is why using 58XX_DEVICE_ID should
be good enough.

>>  	{ .compatible = "brcm,nsp-srab", .data = (void *)BCM58XX_DEVICE_ID },
>>  	{ /* sentinel */ },
>>  };
> Other wise this patch set looks good.
> 
> I was testing a similar change (except for the above, which doesn't
> affect the functionality) to get the switch working and it works.
> 
> Thanks
> Arun
> 


-- 
Florian