linux-kernel - Re: [PATCH 2/7] net: phy: Fix the register offsets in Broadcom iProc mdio mux driver

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Message-ID: <20180726192923.GL10686@lunn.ch>
Date:   Thu, 26 Jul 2018 21:29:23 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Ray Jui <ray.jui@...adcom.com>
Cc:     Arun Parameswaran <arun.parameswaran@...adcom.com>,
        "David S. Miller" <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, bcm-kernel-feedback-list@...adcom.com
Subject: Re: [PATCH 2/7] net: phy: Fix the register offsets in Broadcom iProc
 mdio mux driver

On Thu, Jul 26, 2018 at 12:25:24PM -0700, Ray Jui wrote:
> 
> 
> On 7/26/2018 12:16 PM, Arun Parameswaran wrote:
> >
> >
> >On 18-07-26 12:06 PM, Andrew Lunn wrote:
> >>On Thu, Jul 26, 2018 at 11:36:19AM -0700, Arun Parameswaran wrote:
> >>>Modify the register offsets in the Broadcom iProc mdio mux to start
> >>>from the top of the register address space.
> >>>
> >>>Earlier the base address specified was from the middle of the block's
> >>>register space. The base address will now point to the start of the
> >>>mdio's address space. The offsets have been fixed to match this.
> >>
> >>Hi Arun
> >>
> >>Did you consider a change something like:
> >That looks good. I will make this change to the patch.
> >
> >Thanks
> >Arun
> 
> To make it backward compatible, then length of the resource also needs to be
> adjusted from 0x14 to 0x250 in the driver?
> 
> Otherwise you will end up accessing areas out of 0x14 defined in old DT that
> is not mapped?

struct resource {
       resource_size_t start;
       resource_size_t end;
       const char *name;
       unsigned long flags;
       unsigned long desc;
       struct resource *parent, *sibling, *child;
};

"end" suggests an address, not a length. But it would be good to look
deeper into the code to be sure.

       Andrew