netdev - Re: [PATCH net-next 01/10] net: netcp: ethss: add support of subsystem register region regmap

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Date:   Thu, 22 Dec 2016 15:24:09 -0600
From:   Rob Herring <robh@...nel.org>
To:     Murali Karicheri <m-karicheri2@...com>
Cc:     netdev@...r.kernel.org, linux-omap@...r.kernel.org,
        grygorii.strashko@...com, mugunthanvnm@...com,
        linux-kernel@...r.kernel.org, arnd@...db.de, davem@...emloft.net,
        devicetree@...r.kernel.org, mark.rutland@....com
Subject: Re: [PATCH net-next 01/10] net: netcp: ethss: add support of
 subsystem register region regmap

On Tue, Dec 20, 2016 at 05:09:44PM -0500, Murali Karicheri wrote:
> From: WingMan Kwok <w-kwok2@...com>
> 
> 10gbe phy driver needs to access the 10gbe subsystem control
> register during phy initialization. To facilitate the shared
> access of the subsystem register region between the 10gbe Ethernet
> driver and the phy driver, this patch adds support of the
> subsystem register region defined by a syscon node in the dts.
> 
> Although there is no shared access to the gbe subsystem register
> region, using syscon for that is for the sake of consistency.
> 
> This change is backward compatible with previously released gbe
> devicetree bindings.
> 
> Signed-off-by: WingMan Kwok <w-kwok2@...com>
> Signed-off-by: Murali Karicheri <m-karicheri2@...com>
> Signed-off-by: Sekhar Nori <nsekhar@...com>
> ---
>  .../devicetree/bindings/net/keystone-netcp.txt     |  16 ++-
>  drivers/net/ethernet/ti/netcp_ethss.c              | 140 +++++++++++++++++----
>  2 files changed, 127 insertions(+), 29 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/net/keystone-netcp.txt b/Documentation/devicetree/bindings/net/keystone-netcp.txt
> index 04ba1dc..0854a73 100644
> --- a/Documentation/devicetree/bindings/net/keystone-netcp.txt
> +++ b/Documentation/devicetree/bindings/net/keystone-netcp.txt
> @@ -72,20 +72,24 @@ Required properties:
>  		"ti,netcp-gbe-2" for 1GbE N NetCP 1.5 (N=2)
>  		"ti,netcp-xgbe" for 10 GbE
>  
> +- syscon-subsys:	phandle to syscon node of the switch
> +			subsystem registers.
> +
>  - reg:		register location and the size for the following register
>  		regions in the specified order.
>  		- switch subsystem registers
> +		- sgmii module registers

This needs to go on the end of the list. Otherwise, it is not backwards 
compatible.

>  		- sgmii port3/4 module registers (only for NetCP 1.4)
>  		- switch module registers
>  		- serdes registers (only for 10G)
>  
>  		NetCP 1.4 ethss, here is the order
> -			index #0 - switch subsystem registers
> +			index #0 - sgmii module registers
>  			index #1 - sgmii port3/4 module registers
>  			index #2 - switch module registers
>  
>  		NetCP 1.5 ethss 9 port, 5 port and 2 port
> -			index #0 - switch subsystem registers
> +			index #0 - sgmii module registers
>  			index #1 - switch module registers
>  			index #2 - serdes registers
>  
> @@ -145,6 +149,11 @@ Optional properties:
>  
>  Example binding:
>  
> +gbe_subsys: subsys@...0000 {
> +	compatible = "syscon";
> +	reg = <0x02090000 0x100>;
> +};
> +
>  netcp: netcp@...0000 {
>  	reg = <0x2620110 0x8>;
>  	reg-names = "efuse";
> @@ -163,7 +172,8 @@ netcp: netcp@...0000 {
>  		ranges;
>  		gbe@...00 {
>  			label = "netcp-gbe";
> -			reg = <0x90000 0x300>, <0x90400 0x400>, <0x90800 0x700>;
> +			syscon-subsys = <&gbe_subsys>;
> +			reg = <0x90100 0x200>, <0x90400 0x200>, <0x90800 0x700>;
>  			/* enable-ale; */
>  			tx-queue = <648>;
>  			tx-channel = <8>;