On Fri, Jun 15, 2018 at 4:39 AM, Icenowy Zheng <icenowy@xxxxxxx> wrote:
>
>
> 于 2018年6月15日 GMT+08:00 上午1:27:21, "Jernej Škrabec" <jernej.skrabec@xxxxxxxxx> 写到:
>>Dne četrtek, 14. junij 2018 ob 19:09:56 CEST je Jagan Teki napisal(a):
>>> On Thu, Jun 14, 2018 at 9:05 PM, Chen-Yu Tsai <wens@xxxxxxxx> wrote:
>>> > From: Icenowy Zheng <icenowy@xxxxxxx>
>>> >
>>> > Allwinner A64 has a SRAM controller, and in the device tree
>>currently
>>> > we have a syscon node to enable EMAC driver to access the EMAC
>>clock
>>> > register. As SRAM controller driver can now export regmap for this
>>> > register, replace the syscon node to the SRAM controller device
>>node,
>>> > and let EMAC driver to acquire its EMAC clock regmap.
>>> >
>>> > Signed-off-by: Icenowy Zheng <icenowy@xxxxxxx>
>>> > [wens@xxxxxxxx: Updated compatible string]
>>> > Signed-off-by: Chen-Yu Tsai <wens@xxxxxxxx>
>>> > ---
>>> >
>>> > arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi | 19
>>+++++++++++++++++--
>>> > 1 file changed, 17 insertions(+), 2 deletions(-)
>>> >
>>> > diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
>>> > b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi index
>>> > 1b2ef28c42bd..87968dafe1dc 100644
>>> > --- a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
>>> > +++ b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
>>> > @@ -169,9 +169,24 @@
>>> >
>>> > ranges;
>>> >
>>> > syscon: syscon@1c00000 {
>>> >
>>> > - compatible =
>>> > "allwinner,sun50i-a64-system-controller", -
>>
>>> > "syscon";
>>> > + compatible =
>>> > "allwinner,sun50i-a64-system-control";
>>> >
>>> > reg = <0x01c00000 0x1000>;
>>> >
>>> > + #address-cells = <1>;
>>> > + #size-cells = <1>;
>>> > + ranges;
>>> > +
>>> > + sram_c: sram@18000 {
>>> > + compatible = "mmio-sram";
>>> > + reg = <0x00018000 0x28000>;
>>> > + #address-cells = <1>;
>>> > + #size-cells = <1>;
>>> > + ranges = <0 0x00018000 0x28000>;
>>> > +
>>> > + de2_sram: sram-section@0 {
>>>
>>> So, this can attach to display-engine node through allwinner,sram and
>>> add support to claim the sram on sun4i/sun4i_drv.c, correct?
>>
>>Actually, it has to be added to display_clocks node and claimed in
>>drivers/
>>clk/sunxi-ng/ccu-sun8i-de2.c
>
> Sorry it's old practice.
>
> My new way is to add a bus driver which claims the SRAM.
Are you pointing this driver[1] ? if yes do we have recent version
patches for these changes so-that I can import.
[1] https://patchwork.kernel.org/patch/10290399/
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