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From: Christopher Bostic <cbostic-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
To: Jeremy Kerr <jk-mnsaURCQ41sdnm+yROfE0A@public.gmane.org>,
	Joel Stanley <joel-U3u1mxZcP9KHXe+LvDLADg@public.gmane.org>
Cc: Rob Herring <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
	Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>,
	Russell King <linux-I+IVW8TIWO2tmTQ+vhA3Yw@public.gmane.org>,
	rostedt-nx8X9YLhiw1AfugRpC6u6w@public.gmane.org,
	mingo-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org,
	Greg KH
	<gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org>,
	devicetree <devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
	Linux Kernel Mailing List
	<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	Andrew Jeffery <andrew-zrmu5oMJ5Fs@public.gmane.org>,
	Alistair Popple
	<alistair-Y4h6yKqj69EXC2x5gXVKYQ@public.gmane.org>,
	Benjamin Herrenschmidt
	<benh-XVmvHMARGAS8U2dJNN8I7kB+6BGkLq7r@public.gmane.org>,
	"Edward A . James"
	<eajames-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
Subject: Re: [PATCH v6 19/23] drivers/fsi: Add GPIO based FSI master
Date: Thu, 11 May 2017 11:14:13 -0500	[thread overview]
Message-ID: <f3b94de2-9dee-3c5c-f5d4-579824abb0d0@linux.vnet.ibm.com> (raw)
In-Reply-To: <a079022b-8434-a204-c9b4-696a0580fc8c-mnsaURCQ41sdnm+yROfE0A@public.gmane.org>



On 5/10/17 8:58 PM, Jeremy Kerr wrote:
> Hi Chris,
>
>> I don't think we'd want this per master.   The lock is for the 'top'
>> master issuing commands.  Only the top master can initiate any
>> transactions on the bus to any devices connected downstream. Downstream
>> masters such as hub masters, etc... cannot initiate a command.
> I think what Joel meant there was that we have it per *GPIO* master; if
> there are two GPIO masters on a system, there's no need to provide
> mutual exclusion to each (separate) set of GPIOs.
>
> To implement this, we'd just move the lock into struct fsi_master_gpio.

Hi Jeremy,

Understand now -will make the change.

Thanks
-Chris

> Cheers,
>
>
> Jeremy
>

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  parent reply	other threads:[~2017-05-11 16:14 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20170410194706.64280-1-cbostic@linux.vnet.ibm.com>
2017-04-10 19:46 ` [PATCH v6 02/23] drivers/fsi: Add slave definition Christopher Bostic
2017-04-10 19:46 ` [PATCH v6 03/23] drivers/fsi: Add empty master scan Christopher Bostic
2017-04-10 19:46 ` [PATCH v6 04/23] drivers/fsi: Add crc4 helpers Christopher Bostic
2017-04-10 19:46 ` [PATCH v6 07/23] drivers/fsi: Implement slave initialisation Christopher Bostic
     [not found]   ` <20170410194706.64280-8-cbostic-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
2017-05-02  6:24     ` Joel Stanley
     [not found]       ` <CACPK8XeQnqD3TV_+38hTjb8Qf4R7Um6Eztuun-T6vTMvigw+cQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-05-02 18:58         ` Christopher Bostic
2017-04-10 19:46 ` [PATCH v6 08/23] drivers/fsi: Set slave SMODE to init communication Christopher Bostic
2017-04-10 19:46 ` [PATCH v6 09/23] drivers/fsi: scan slaves & register devices Christopher Bostic
2017-05-10  7:30   ` Joel Stanley
2017-05-10 18:24     ` Christopher Bostic
2017-04-10 19:46 ` [PATCH v6 12/23] drivers/fsi: Add documentation for GPIO bindings Christopher Bostic
     [not found] ` <20170410194706.64280-1-cbostic-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
2017-04-10 19:46   ` [PATCH v6 01/23] drivers/fsi: Add fsi master definition Christopher Bostic
2017-04-10 19:46   ` [PATCH v6 05/23] drivers/fsi: Add slave & master read/write APIs Christopher Bostic
2017-04-10 19:46   ` [PATCH v6 06/23] drivers/fsi: Set up links for slave communication Christopher Bostic
2017-04-10 19:46   ` [PATCH v6 10/23] drivers/fsi: Add device read/write/peek API Christopher Bostic
     [not found]     ` <20170410194706.64280-11-cbostic-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
2017-05-02  5:25       ` [v6,10/23] " Brad Bishop
2017-05-10  8:13     ` [PATCH v6 10/23] " Joel Stanley
     [not found]       ` <CACPK8Xewjnpvc3sN=X9tMm7NP6rQ=NHKDuxwYO4DFjRw63PP8A-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-05-10 18:38         ` Christopher Bostic
2017-04-10 19:46   ` [PATCH v6 11/23] drivers/fsi: Add master unscan Christopher Bostic
     [not found]     ` <20170410194706.64280-12-cbostic-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
2017-05-10  7:31       ` Joel Stanley
     [not found]         ` <CACPK8Xd5g+tZ7_pTO19YhDhyAUggp2fN2YDp7-1SSP+-9qZu9w-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-05-10 18:33           ` Christopher Bostic
2017-04-10 19:46   ` [PATCH v6 13/23] drivers/fsi: Add client driver register utilities Christopher Bostic
2017-04-10 19:46   ` [PATCH v6 15/23] drivers/fsi: expose direct-access slave API Christopher Bostic
2017-04-10 19:47   ` [PATCH v6 18/23] drivers/fsi: Document FSI master sysfs files in ABI Christopher Bostic
2017-05-10  7:30     ` Joel Stanley
     [not found]       ` <CACPK8Xc4kv1Y_82ShYAfNjzf480Ab1ws95QSxPT8VE2XF+nueA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-05-10 18:20         ` Christopher Bostic
2017-04-10 19:47   ` [PATCH v6 19/23] drivers/fsi: Add GPIO based FSI master Christopher Bostic
     [not found]     ` <20170410194706.64280-20-cbostic-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
2017-05-10  7:30       ` Joel Stanley
     [not found]         ` <CACPK8Xf1Y31+HBHb0ErpnZ4xVM+bzfHV-khj-kz8Unk1cTx6gw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-05-10 18:15           ` Christopher Bostic
     [not found]             ` <c05599db-7767-e712-7199-7d5a4ac6486f-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
2017-05-11  1:58               ` Jeremy Kerr
     [not found]                 ` <a079022b-8434-a204-c9b4-696a0580fc8c-mnsaURCQ41sdnm+yROfE0A@public.gmane.org>
2017-05-11 16:14                   ` Christopher Bostic [this message]
2017-04-10 19:47   ` [PATCH v6 21/23] drivers/fsi: Add SCOM FSI client device driver Christopher Bostic
2017-04-10 19:47   ` [PATCH v6 22/23] drivers/ fsi: Add hub master support Christopher Bostic
2017-04-10 19:46 ` [PATCH v6 14/23] drivers/fsi: Add sysfs files for FSI master & slave accesses Christopher Bostic
2017-04-10 19:46 ` [PATCH v6 16/23] drivers/fsi: Add tracepoints for low-level operations Christopher Bostic
2017-04-10 19:47 ` [PATCH v6 17/23] drivers/fsi: Add error handling for slave communication errors Christopher Bostic
2017-04-10 19:47 ` [PATCH v6 20/23] drivers/fsi/gpio: Add tracepoints for GPIO master Christopher Bostic
2017-04-10 19:47 ` [PATCH v6 23/23] drivers/fsi: Use asynchronous slave mode Christopher Bostic

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