Rob,
On 12/22/2016 04:24 PM, Rob Herring wrote:
> On Tue, Dec 20, 2016 at 05:09:44PM -0500, Murali Karicheri wrote:
>> From: WingMan Kwok <w-kwok2@xxxxxx>
>>
>> 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@xxxxxx>
>> Signed-off-by: Murali Karicheri <m-karicheri2@xxxxxx>
>> Signed-off-by: Sekhar Nori <nsekhar@xxxxxx>
>> ---
>> .../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.
Thanks for your review! I assumed backward compatibility means new kernel
should work with old DTB. The driver code is adjusted to work with both
DTBs. Isn't that enough?
Murali
>
>> - 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@2090000 {
>> + compatible = "syscon";
>> + reg = <0x02090000 0x100>;
>> +};
>> +
>> netcp: netcp@2000000 {
>> reg = <0x2620110 0x8>;
>> reg-names = "efuse";
>> @@ -163,7 +172,8 @@ netcp: netcp@2000000 {
>> ranges;
>> gbe@90000 {
>> 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>;
>
--
Murali Karicheri
Linux Kernel, Keystone
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