On Sun, Mar 11, 2018 at 02:53:03PM +0100, Linus Walleij wrote:
> This adds the actual VGA DAC bridge that is used in the
> Versatile AB, and sets the mode to 640x480 VGA.
>
> The "clcd" clock was incorrectly named, the proper name
> (from bindings) is "clcdclk". So far drivers survived
> by just getting the first clock, but future drivers will
> use named clocks.
>
> We add the panel connector to the
> "arm,versatile-tft-panel" as well, the signals actually
> fork on the board, reaching both the VGA DAC and the
> display connector.
>
> Cc: Liviu Dudau
> Cc: Mali DP Maintainers
> Signed-off-by: Linus Walleij
Reviewed-by: Liviu Dudau
> ---
> arch/arm/boot/dts/versatile-ab.dts | 83
> +-
> 1 file changed, 81 insertions(+), 2 deletions(-)
>
> diff --git a/arch/arm/boot/dts/versatile-ab.dts
> b/arch/arm/boot/dts/versatile-ab.dts
> index 4a51612996bc..5f61d3609027 100644
> --- a/arch/arm/boot/dts/versatile-ab.dts
> +++ b/arch/arm/boot/dts/versatile-ab.dts
> @@ -30,6 +30,43 @@
> clock-frequency = <2400>;
> };
>
> + bridge {
> + compatible = "ti,ths8134b", "ti,ths8134";
> + #address-cells = <1>;
> + #size-cells = <0>;
> +
> + ports {
> + #address-cells = <1>;
> + #size-cells = <0>;
> +
> + port@0 {
> + reg = <0>;
> +
> + vga_bridge_in: endpoint {
> + remote-endpoint = <&clcd_pads_vga_dac>;
> + };
> + };
> +
> + port@1 {
> + reg = <1>;
> +
> + vga_bridge_out: endpoint {
> + remote-endpoint = <&vga_con_in>;
> + };
> + };
> + };
> + };
> +
> + vga {
> + compatible = "vga-connector";
> +
> + port {
> + vga_con_in: endpoint {
> + remote-endpoint = <&vga_bridge_out>;
> + };
> + };
> + };
> +
> core-module@1000 {
> compatible = "arm,core-module-versatile", "syscon",
> "simple-mfd";
> reg = <0x1000 0x200>;
> @@ -230,7 +267,39 @@
> reg = <0x1012 0x1000>;
> interrupts = <16>;
> clocks = <&osc1>, <&pclk>;
> - clock-names = "clcd", "apb_pclk";
> + clock-names = "clcdclk", "apb_pclk";
> + /* 800x600 16bpp @ 36MHz works fine */
> + max-memory-bandwidth = <5400>;
> +
> + /*
> + * This port is routed through a PLD (Programmable
> + * Logic Device) that routes the output from the CLCD
> + * (after transformations) to the VGA DAC and also an
> + * external panel connector. The PLD is essential for
> + * supporting RGB565/BGR565.
> + *
> + * The signals from the port thus reaches two endpoints.
> + * The PLD is managed through a few special bits in the
> + * FPGA "sysreg".
> + *
> + * This arrangement can be clearly seen in
> + * ARM DUI 0225D, page 3-41, figure 3-19.
> + */
If I remember correctly, besides being able to flip outputs via "sysreg"
there was a debug menu on the microcontroller that had options to set
the MUX to the right output before OS boot.
That brings back a lot of memories that I thought I'll never have any
use of :)
Best regards,
Liviu
> + port@0 {
> + #address-cells = <1>;
> + #size-cells = <0>;
> +
> + clcd_pads_panel: endpoint@0 {
> + reg = <0>;
> + remote-endpoint = <&panel_in>;
> + arm,pl11x,tft-r0g0b0-pads = <0 8 16>;
> + };
> + clcd_pads_vga_dac: endpoint@1 {
> + reg = <1>;
> + remote-endpoint = <&vga_bridge_in>;
> + arm,pl11x,tft-r0g0b0-pads = <0 8 16>;
> + };
> + };
> };
>
> sctl@101e {
> @@ -319,8 +388,18 @@
> ranges = <0 0x1000 0x1>;
>
> sysreg@0 {
> - compatible = "arm,versatile-sysreg", "syscon";
> + compatible = "arm,versatile-sysreg", "syscon",
> "simp
