[PATCH v2 2/2] ARM: dts: stm32: Enable MIPI DSI display support.
Rob Herring
robh at kernel.org
Mon Jul 13 22:49:12 EDT 2020
On Thu, Jul 02, 2020 at 08:27:14PM +0300, Adrian Pop wrote:
> STM32f769-disco features a 4" MIPI DSI display: add support for it.
> On Cortex-M7 DMA can't use cached memory. For this reason I use a dedicated
> memory pool for DMA with no-cache attribute which is located at the end of
> RAM.
>
> Signed-off-by: Adrian Pop <pop.adrian61 at gmail.com>
> ---
> arch/arm/boot/dts/stm32f746.dtsi | 34 +++++++++++++++++++
> arch/arm/boot/dts/stm32f769-disco.dts | 49 +++++++++++++++++++++++++++
> 2 files changed, 83 insertions(+)
>
> diff --git a/arch/arm/boot/dts/stm32f746.dtsi b/arch/arm/boot/dts/stm32f746.dtsi
> index 93c063796780..577a812ca01c 100644
> --- a/arch/arm/boot/dts/stm32f746.dtsi
> +++ b/arch/arm/boot/dts/stm32f746.dtsi
> @@ -48,6 +48,19 @@ / {
> #address-cells = <1>;
> #size-cells = <1>;
>
> + reserved-memory {
> + #address-cells = <1>;
> + #size-cells = <1>;
> + ranges;
> +
> + linux,dma {
Build your DT with W=1. This will have a warning.
> + compatible = "shared-dma-pool";
> + linux,dma-default;
> + no-map;
> + reg = <0xc0f00000 0x100000>;
> + };
> + };
> +
> clocks {
> clk_hse: clk-hse {
> #clock-cells = <0>;
> @@ -75,6 +88,27 @@ clk_i2s_ckin: clk-i2s-ckin {
> };
>
> soc {
> + ltdc: display-controller at 40016800 {
> + compatible = "st,stm32-ltdc";
> + reg = <0x40016800 0x200>;
> + interrupts = <88>, <89>;
> + resets = <&rcc STM32F7_APB2_RESET(LTDC)>;
> + clocks = <&rcc 1 CLK_LCD>;
> + clock-names = "lcd";
> + status = "disabled";
> + };
> +
> + dsi: dsi at 40016c00 {
> + compatible = "st,stm32-dsi";
> + reg = <0x40016c00 0x800>;
> + interrupts = <98>;
> + clocks = <&rcc 1 CLK_F769_DSI>, <&clk_hse>;
> + clock-names = "pclk", "ref";
> + resets = <&rcc STM32F7_APB2_RESET(DSI)>;
> + reset-names = "apb";
> + status = "disabled";
> + };
> +
> timer2: timer at 40000000 {
> compatible = "st,stm32-timer";
> reg = <0x40000000 0x400>;
> diff --git a/arch/arm/boot/dts/stm32f769-disco.dts b/arch/arm/boot/dts/stm32f769-disco.dts
> index 1626e00bb2cb..a9e81b49809c 100644
> --- a/arch/arm/boot/dts/stm32f769-disco.dts
> +++ b/arch/arm/boot/dts/stm32f769-disco.dts
> @@ -153,3 +153,52 @@ &usbotg_hs {
> pinctrl-names = "default";
> status = "okay";
> };
> +
> +&dsi {
> + #address-cells = <1>;
> + #size-cells = <0>;
> + status = "okay";
> +
> + ports {
> + #address-cells = <1>;
> + #size-cells = <0>;
> +
> + port at 0 {
> + reg = <0>;
> + dsi_in: endpoint {
> + remote-endpoint = <<dc_out_dsi>;
> + };
> + };
> +
> + port at 1 {
> + reg = <1>;
> + dsi_out: endpoint {
> + remote-endpoint = <&dsi_in_panel>;
> + };
> + };
> +
> + };
> +
> + panel: panel {
> + compatible = "orisetech,otm8009a";
> + reg = <0>;
> + reset-gpios = <&gpioj 15 GPIO_ACTIVE_LOW>;
> + status = "okay";
Don't need status. Enabled is the default.
> +
> + port {
> + dsi_in_panel: endpoint {
> + remote-endpoint = <&dsi_out>;
> + };
> + };
> + };
> +};
> +
> +<dc {
> + status = "okay";
> +
> + port {
> + ltdc_out_dsi: endpoint {
> + remote-endpoint = <&dsi_in>;
> + };
> + };
> +};
> --
> 2.27.0
>
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