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.
>
>Best regards,
>Jernej
>
>
>
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