From: Russell King - ARM Linux <linux@armlinux.org.uk>
To: Florian Fainelli <f.fainelli@gmail.com>
Cc: linux-arm-kernel@lists.infradead.org,
Rob Herring <robh+dt@kernel.org>,
Mark Rutland <mark.rutland@arm.com>, Ray Jui <rjui@broadcom.com>,
Scott Branden <sbranden@broadcom.com>,
Jon Mason <jonmason@broadcom.com>,
"maintainer:BROADCOM IPROC ARM ARCHITECTURE"
<bcm-kernel-feedback-list@broadcom.com>,
"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
<devicetree@vger.kernel.org>,
open list <linux-kernel@vger.kernel.org>,
andrew@lunn.ch
Subject: Re: [PATCH 1/3] ARM: dts: NSP: Enable SFP on bcm958625hr
Date: Mon, 27 Aug 2018 23:26:46 +0100 [thread overview]
Message-ID: <20180827222646.GF30658@n2100.armlinux.org.uk> (raw)
In-Reply-To: <20180827200344.16158-2-f.fainelli@gmail.com>
On Mon, Aug 27, 2018 at 01:03:42PM -0700, Florian Fainelli wrote:
> Enable the SFP connected to port 5 of the switch and wire up all GPIOs
> to the SFP cage. Because of a hardware limitation of the i2c controller
> on the iProc SoCs which prevents large i2c (> 256 bytes) transactions to
> work, we use the i2c-gpio interface instead, which does not have that
> limitation. This allows us to read the SFP module EEPROM, which would
> not be possible otherwise since it exceeds that size during a single
> read transfer.
We shouldn't exceed 256 bytes, since 256 bytes is the "page" size
of the EEPROM. The most that we read in one block is either
ETH_MODULE_SFF_8079_LEN or (ETH_MODULE_SFF_8472_LEN -
ETH_MODULE_SFF_8079_LEN), both of which result in no more than 256
byte reads.
--
RMK's Patch system: http://www.armlinux.org.uk/developer/patches/
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next prev parent reply other threads:[~2018-08-27 22:27 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-27 20:03 [PATCH 0/3] ARM: NSP updates to support switch interrupts/SFP Florian Fainelli
2018-08-27 20:03 ` [PATCH 1/3] ARM: dts: NSP: Enable SFP on bcm958625hr Florian Fainelli
2018-08-27 20:35 ` Andrew Lunn
2018-08-27 20:52 ` Florian Fainelli
2018-08-27 21:09 ` Andrew Lunn
2018-08-27 21:17 ` Florian Fainelli
2018-08-27 21:31 ` Andrew Lunn
2018-08-27 21:09 ` Florian Fainelli
2018-08-27 22:26 ` Russell King - ARM Linux [this message]
2018-08-27 22:36 ` Florian Fainelli
2018-08-27 20:03 ` [PATCH 2/3] dt-bindings: net: dsa: Document B53 SRAB interrupts and registers Florian Fainelli
2018-08-27 20:03 ` [PATCH 3/3] ARM: dts: NSP: Wire up switch interrupts Florian Fainelli
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