linux-kernel - Re: [PATCH v5 22/23] drivers/fsi: Add hub master support

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Message-Id: <0abce906-778f-2478-a859-f993cd40988f@linux.vnet.ibm.com>
Date:   Sun, 9 Apr 2017 16:07:02 -0500
From:   Christopher Bostic <cbostic@...ux.vnet.ibm.com>
To:     Randy Dunlap <rdunlap@...radead.org>, robh+dt@...nel.org,
        mark.rutland@....com, linux@...linux.org.uk, rostedt@...dmis.org,
        mingo@...hat.com, gregkh@...uxfoundation.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc:     joel@....id.au, linux-kernel@...r.kernel.org, andrew@...id.au,
        alistair@...ple.id.au, benh@...nel.crashing.org,
        Jeremy Kerr <jk@...abs.org>
Subject: Re: [PATCH v5 22/23] drivers/fsi: Add hub master support



On 4/5/17 11:36 AM, Randy Dunlap wrote:
> On 04/04/17 19:06, Christopher Bostic wrote:
>> From: Chris Bostic <cbostic@...ux.vnet.ibm.com>
>>
>> Add an engine driver to expose a "hub" FSI master - which has a set of
>> control registers in the engine address space, and uses a chunk of the
>> slave address space for actual FSI communication.
>>
>> Additional changes from Jeremy Kerr <jk@...abs.org>.
>>
>> Signed-off-by: Chris Bostic <cbostic@...ux.vnet.ibm.com>
>> Signed-off-by: Jeremy Kerr <jk@...abs.org>
>> Signed-off-by: Joel Stanley <joel@....id.au>
>> ---
>>   drivers/fsi/Kconfig          |   9 ++
>>   drivers/fsi/Makefile         |   1 +
>>   drivers/fsi/fsi-master-hub.c | 327 +++++++++++++++++++++++++++++++++++++++++++
>>   3 files changed, 337 insertions(+)
>>   create mode 100644 drivers/fsi/fsi-master-hub.c
>>
>> diff --git a/drivers/fsi/Kconfig b/drivers/fsi/Kconfig
>> index 0fa265c..e1156b4 100644
>> --- a/drivers/fsi/Kconfig
>> +++ b/drivers/fsi/Kconfig
>> @@ -18,6 +18,15 @@ config FSI_MASTER_GPIO
>>   	---help---
>>   	This option enables a FSI master driver using GPIO lines.
>>   
>> +config FSI_MASTER_HUB
>> +	tristate "FSI hub master"
>> +	depends on FSI
> redundant again.

Will correct.

Thanks,
Chris
>
>> +	---help---
>> +	This option enables a FSI hub master driver.  Hub is a type of FSI
>> +	master that is connected to the upstream master via a slave.  Hubs
>> +	allow chaining of FSI links to an arbitrary depth.  This allows for
>> +	a high target device fanout.
>> +
>>   config FSI_SCOM
>>   	tristate "SCOM FSI client device driver"
>>   	depends on FSI
>