Hi Srinivas,
On Tue, Nov 12, 2013 at 01:53:03PM +0000, srinivas.kandaga...@st.com wrote:
> From: Srinivas Kandagatla <srinivas.kandaga...@st.com>
>
> STi series SOCs have a glue layer on top of the synopsis gmac IP, this
> glue layer needs to be configured before the gmac driver starts using
> the IP.
>
> This patch adds a platform driver for the glue layer which configures
> the IP before stmmac driver takes over.
>
> Signed-off-by: Srinivas Kandagatla <srinivas.kandaga...@st.com>
> ---
> .../devicetree/bindings/net/sti-dwmac.txt | 45 +++
> drivers/net/ethernet/stmicro/stmmac/Makefile | 1 +
> drivers/net/ethernet/stmicro/stmmac/dwmac-sti.c | 294
> ++++++++++++++++++++
> 3 files changed, 340 insertions(+), 0 deletions(-)
> create mode 100644 Documentation/devicetree/bindings/net/sti-dwmac.txt
> create mode 100644 drivers/net/ethernet/stmicro/stmmac/dwmac-sti.c
>
> diff --git a/Documentation/devicetree/bindings/net/sti-dwmac.txt
> b/Documentation/devicetree/bindings/net/sti-dwmac.txt
> new file mode 100644
> index 0000000..5431d9d
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/net/sti-dwmac.txt
> @@ -0,0 +1,45 @@
> +STMicroelectronics SoC DWMAC controller
> +
> +The device node has following properties.
> +
> +Required properties:
> + - compatible : Can be "st,stih415-dwmac", "st,stih416-dwmac" or
> + "st,stid127-dwmac".
> + - reg : Offset of the glue configuration register map in
> system
> + configuration regmap pointed by st,syscon property and size.
> + - st,syscon : Should be phandle to system configuration node which
> + encompases this glue registers.
> + - st,tx-retime-src: This specifies which clk is wired up to the mac for
> + retimeing tx lines. This is totally board dependent and can take one of
> the
> + posssible values from "txclk", "clk_125", "phyclk" or "clkgen".
> +
> +Optional properties:
> + - resets : phandle pointing to the system reset controller with correct
> + reset line index for ethernet reset.
> +
> +Sub-nodes:
> +The dwmac core should be added as subnode to STMicroelectronics dwmac glue.
> +- dwmac : The binding details of dwmac can be found in
> + Documentation/devicetree/bindings/net/stmmac.txt
> +
> +Example:
> +
> +ethernet0: ethernet0{
> + #address-cells = <1>;
> + #size-cells = <1>;
> + compatible = "st,stih415-dwmac";
> + reg = <0x148 0x4>;
> + resets = <&softreset STIH415_ETH0_SOFTRESET>;
> + st,syscon = <&syscfg_rear>;
> + st,tx-retime-src = "clk_125";
> + ranges;
> +
> + dwmac0:dwmac@fe810000 {
> + device_type = "network";
> + compatible = "snps,dwmac", "snps,dwmac-3.610";
> + reg = <0xfe810000 0x8000>;
> + interrupts = <0 147 0>;
> + interrupt-names = "macirq";
> + ...
> + };
> +};
Sorry for stepping up so late, but I dont' think this is the right way
to do it.
DT is to describe how the hardware is laid out in a system agnostic
way, hence, it should not be impacted by the implementation details.
The fact that you use a glue to the dwmac driver *is* an
implementation detail.
I think you'd rather have something like:
dwmac0: ethernet@fe810000 {
compatible = "st,stih415-dwmac";
reg = <0xfe810000 0x8000 0x148 0x4>;
resets = <&softreset STIH415_ETH0_SOFTRESET>;
st,syscon = <&syscfg_rear>;
st,tx-retime-src = "clk_125";
interrupts = <0 147 0>;
interrupt-names = "macirq";
...
};
Then, the driver can have its init functions associated to the
compatible you're using, through the .data field of the of_device_id
structure, and you just call it in the generic driver at probe's time.
I don't really know what this syscon thing is either, but I think the
reg <0x148 0x4> is related to that.
Why don't you pass it directly in the st,syscon property, to have
something like <&syscfg_rear 0x148>?
Maxime
--
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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