Re: [PATCH 10/11] arm64: dts: imx8mm: add GPC node and power domains

[Adam Ford <aford173@gmail.com>]

On Wed, Sep 30, 2020 at 10:55 AM Lucas Stach <l.stach@pengutronix.de> wrote:
>
> This adds the DT nodes to describe the power domains available on the
> i.MX8MM. Things are a bit more complex compared to other GPCv2 power
> domain setups, as there is now a hierarchy of domains where complete
> subsystems (HSIO, GPU, DISPLAY) can be gated as a whole, but also
> fine granular gating within those subsystems is possible.
>
> Note that this is still incomplete, as both VPU and DISP domains are
> missing their reset clocks. Those aren't directly sourced from the CCM,
> but have another level of clock gating in the BLKCTL of those domains,
> which needs a separate driver.
>
> Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
> ---
>  arch/arm64/boot/dts/freescale/imx8mm.dtsi | 57 +++++++++++++++++++++++
>  1 file changed, 57 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/freescale/imx8mm.dtsi b/arch/arm64/boot/dts/freescale/imx8mm.dtsi
> index 76f040e4be5e..a841fb2d0458 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mm.dtsi
> +++ b/arch/arm64/boot/dts/freescale/imx8mm.dtsi
> @@ -4,6 +4,8 @@
>   */
>
>  #include <dt-bindings/clock/imx8mm-clock.h>
> +#include <dt-bindings/power/imx8mm-power.h>
> +#include <dt-bindings/reset/imx8mq-reset.h>
>  #include <dt-bindings/gpio/gpio.h>
>  #include <dt-bindings/input/input.h>
>  #include <dt-bindings/interrupt-controller/arm-gic.h>
> @@ -547,6 +549,61 @@
>                                 interrupts = <GIC_SPI 89 IRQ_TYPE_LEVEL_HIGH>;
>                                 #reset-cells = <1>;
>                         };
> +
> +                       gpc: gpc@303a0000 {
> +                               compatible = "fsl,imx8mm-gpc";
> +                               reg = <0x303a0000 0x10000>;
> +                               interrupt-parent = <&gic>;
> +                               interrupt-controller;
> +                               #interrupt-cells = <3>;

Does this need an interrupt index within the GIC?
possibly something like:   interrupts = <GIC_SPI 87 IRQ_TYPE_LEVEL_HIGH>;


> +
> +                               pgc {
> +                                       #address-cells = <1>;
> +                                       #size-cells = <0>;
> +
> +                                       pgc_hsiomix: power-domain@0 {
> +                                               #power-domain-cells = <0>;
> +                                               reg = <IMX8MM_POWER_DOMAIN_HSIOMIX>;
> +                                               clocks = <&clk IMX8MM_CLK_USB_BUS>;
> +                                       };
> +
> +                                       pgc_pcie: power-domain@1 {
> +                                               #power-domain-cells = <0>;
> +                                               reg = <IMX8MM_POWER_DOMAIN_PCIE>;
> +                                               power-domains = <&pgc_hsiomix>;
> +                                       };
> +
> +                                       pgc_otg1: power-domain@2 {
> +                                               #power-domain-cells = <0>;
> +                                               reg = <IMX8MM_POWER_DOMAIN_OTG1>;
> +                                               power-domains = <&pgc_hsiomix>;
> +                                       };
> +
> +                                       pgc_otg2: power-domain@3 {
> +                                               #power-domain-cells = <0>;
> +                                               reg = <IMX8MM_POWER_DOMAIN_OTG2>;
> +                                               power-domains = <&pgc_hsiomix>;
> +                                       };
> +
> +                                       pgc_gpumix: power-domain@4 {
> +                                               #power-domain-cells = <0>;
> +                                               reg = <IMX8MM_POWER_DOMAIN_GPUMIX>;
> +                                               clocks = <&clk IMX8MM_CLK_GPU_BUS_ROOT>,
> +                                                        <&clk IMX8MM_CLK_GPU_AHB>;
> +                                       };
> +
> +                                       pgc_gpu: power-domain@5 {
> +                                               #power-domain-cells = <0>;
> +                                               reg = <IMX8MM_POWER_DOMAIN_GPU>;
> +                                               clocks = <&clk IMX8MM_CLK_GPU_AHB>,
> +                                                        <&clk IMX8MM_CLK_GPU_BUS_ROOT>,
> +                                                        <&clk IMX8MM_CLK_GPU2D_ROOT>,
> +                                                        <&clk IMX8MM_CLK_GPU3D_ROOT>;
> +                                               resets = <&src IMX8MQ_RESET_GPU_RESET>;
> +                                               power-domains = <&pgc_gpumix>;
> +                                       };
> +                               };
> +                       };
>                 };
>
>                 aips2: bus@30400000 {
> --
> 2.20.1
>
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel