linux-kernel - Re: [PATCH 1/7] dt-bindings: net: Fix Broadcom iProc mdio mux driver base address

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Message-ID: <20180726190103.GF10686@lunn.ch>
Date:   Thu, 26 Jul 2018 21:01:03 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Arun Parameswaran <arun.parameswaran@...adcom.com>
Cc:     "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 1/7] dt-bindings: net: Fix Broadcom iProc mdio mux driver
 base address

On Thu, Jul 26, 2018 at 11:36:18AM -0700, Arun Parameswaran wrote:
> Modify the base address passed to the Broadcom iProc MDIO mux driver
> to point to the start of the block's register address space.
> 
> Fixes: ce8d5dbfd64f ("Add DT binding doc for Broadcom MDIO bus multiplexer")

Hi Arun

Fixes generally means something explodes, throws an Opps, userspace
does the wrong thing. Documentation/process/stable-kernel-rules.rst
says:

 - It must fix a real bug that bothers people (not a, "This could be a
   problem..." type thing).

Please explain how this is a real problem and what people it bothers.

I also don't see any attempt to keep backwards compatibility with
older device tree blobs. Is it intentional you will break such old
blobs?

Thanks
	Andrew


> Signed-off-by: Arun Parameswaran <arun.parameswaran@...adcom.com>
> ---
>  Documentation/devicetree/bindings/net/brcm,mdio-mux-iproc.txt | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/net/brcm,mdio-mux-iproc.txt b/Documentation/devicetree/bindings/net/brcm,mdio-mux-iproc.txt
> index dfe287a..dc8aa68 100644
> --- a/Documentation/devicetree/bindings/net/brcm,mdio-mux-iproc.txt
> +++ b/Documentation/devicetree/bindings/net/brcm,mdio-mux-iproc.txt
> @@ -18,9 +18,9 @@ at- Documentation/devicetree/bindings/net/mdio-mux.txt
>  
>  
>  for example:
> -		mdio_mux_iproc: mdio-mux@...2023c {
> +		mdio_mux_iproc: mdio-mux@...20000 {
>  			compatible = "brcm,mdio-mux-iproc";
> -			reg = <0x6602023c 0x14>;
> +			reg = <0x66020000 0x250>;
>  			#address-cells = <1>;
>  			#size-cells = <0>;
>  
> -- 
> 1.9.1
>