RE: [PATCH v1] arm64: dts: imx8mx: move soc device into ocotp

From: Aisheng Dong
Date: Sat Jun 12 2021 - 07:52:19 EST

> From: Robin Gong <yibin.gong@xxxxxxx>
> Sent: Tuesday, June 8, 2021 2:05 AM
>
> move soc device into ocotp device node instead of the parent device of the all
> devices which located in 'soc@0', otherwise, all probed children devices will be
> reorder to dmp_list again once 'imx8mx-soc'
> device defered probed, which may break driver's suspend/resume sequence,
> such as imx_spdif and fsl_spdif, hence the later would suspended before the
> former as below and endless interrupt may never be handled since clock has
> been disabled already in the later.
>
> [ 1.930598] calling fsl_spdif_driver_init+0x0/0x20 @ 1
> [ 1.955712] initcall fsl_spdif_driver_init+0x0/0x20 returned 0 after 24512
> usecs
> [ 1.981963] calling imx_spdif_driver_init+0x0/0x20 @ 1
> [ 1.986600] initcall imx_spdif_driver_init+0x0/0x20 returned 0 after 4509
> usecs
> [ 2.901408] #0: imx-spdif
> [ 21.151529] fsl-spdif-dai 30090000.spdif: calling
> platform_pm_suspend+0x0/0x70 @ 470, parent: 30000000.bus
> [ 21.161189] fsl-spdif-dai 30090000.spdif: platform_pm_suspend+0x0/0x70
> returned 0 after 0 usecs
> [ 21.474311] imx-spdif sound-spdif: calling
> platform_pm_suspend+0x0/0x70 @ 470, parent: platform
> [ 21.483024] imx-spdif sound-spdif: platform_pm_suspend+0x0/0x70
> returned 0 after 9 usecs
>
> Signed-off-by: Robin Gong <yibin.gong@xxxxxxx>

You need change binding doc first and pass make dtbs_check.
Basically I agree it's is better moving fsl,imx8x-soc compatible string
into ocotp as an sub mfd function nodes from HW point of view.

But I think there's a few issues you also need address:
1. as you changed to mfd way now, the code implementation should also align with it
e.g. nvmem-cells could be dropped

2. The common nvmem dt schema may not be compatible with common mfd binding
e.g. according to nvmem dt schema, all subnodes are nvmem cells.
You can check if make dtbs_check complain. If yes, I guess you need update nvmem
Binding to be compatible with mfd binding.

Regards
Aisheng

> ---
> arch/arm64/boot/dts/freescale/imx8mm.dtsi | 12 ++++++++----
> arch/arm64/boot/dts/freescale/imx8mn.dtsi | 13 +++++++++----
> arch/arm64/boot/dts/freescale/imx8mp.dtsi | 13 +++++++++----
> arch/arm64/boot/dts/freescale/imx8mq.dtsi | 12 ++++++++----
> 4 files changed, 34 insertions(+), 16 deletions(-)
>
> diff --git a/arch/arm64/boot/dts/freescale/imx8mm.dtsi
> b/arch/arm64/boot/dts/freescale/imx8mm.dtsi
> index e7648c3..9ef0554 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mm.dtsi
> +++ b/arch/arm64/boot/dts/freescale/imx8mm.dtsi
> @@ -257,13 +257,11 @@
> };
>
> soc@0 {
> - compatible = "fsl,imx8mm-soc", "simple-bus";
> + compatible = "simple-bus";
> #address-cells = <1>;
> #size-cells = <1>;
> ranges = <0x0 0x0 0x0 0x3e000000>;
> dma-ranges = <0x40000000 0x0 0x40000000 0xc0000000>;
> - nvmem-cells = <&imx8mm_uid>;
> - nvmem-cell-names = "soc_unique_id";
>
> aips1: bus@30000000 {
> compatible = "fsl,aips-bus", "simple-bus"; @@ -522,7 +520,7
> @@
> };
>
> ocotp: efuse@30350000 {
> - compatible = "fsl,imx8mm-ocotp", "syscon";
> + compatible = "fsl,imx8mm-ocotp", "syscon", "simple-mfd";
> reg = <0x30350000 0x10000>;
> clocks = <&clk IMX8MM_CLK_OCOTP_ROOT>;
> /* For nvmem subnodes */
> @@ -540,6 +538,12 @@
> fec_mac_address: mac-address@90 {
> reg = <0x90 6>;
> };
> +
> + imx8mm_soc: imx8mm-soc {
> + compatible = "fsl,imx8mm-soc";
> + nvmem-cells = <&imx8mm_uid>;
> + nvmem-cell-names = "soc_unique_id";
> + };
> };
>
> anatop: anatop@30360000 {
> diff --git a/arch/arm64/boot/dts/freescale/imx8mn.dtsi
> b/arch/arm64/boot/dts/freescale/imx8mn.dtsi
> index d4231e0..f82905c 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mn.dtsi
> +++ b/arch/arm64/boot/dts/freescale/imx8mn.dtsi
> @@ -241,13 +241,11 @@
> };
>
> soc@0 {
> - compatible = "fsl,imx8mn-soc", "simple-bus";
> + compatible = "simple-bus";
> #address-cells = <1>;
> #size-cells = <1>;
> ranges = <0x0 0x0 0x0 0x3e000000>;
> dma-ranges = <0x40000000 0x0 0x40000000 0xc0000000>;
> - nvmem-cells = <&imx8mn_uid>;
> - nvmem-cell-names = "soc_unique_id";
>
> aips1: bus@30000000 {
> compatible = "fsl,aips-bus", "simple-bus"; @@ -528,7 +526,8
> @@
> };
>
> ocotp: efuse@30350000 {
> - compatible = "fsl,imx8mn-ocotp", "fsl,imx8mm-ocotp",
> "syscon";
> + compatible = "fsl,imx8mn-ocotp", "fsl,imx8mm-ocotp",
> "syscon",
> + "simple-mfd";
> reg = <0x30350000 0x10000>;
> clocks = <&clk IMX8MN_CLK_OCOTP_ROOT>;
> #address-cells = <1>;
> @@ -545,6 +544,12 @@
> fec_mac_address: mac-address@90 {
> reg = <0x90 6>;
> };
> +
> + imx8mn_soc: imx8mn-soc {
> + compatible = "fsl,imx8mn-soc";
> + nvmem-cells = <&imx8mn_uid>;
> + nvmem-cell-names = "soc_unique_id";
> + };
> };
>
> anatop: anatop@30360000 {
> diff --git a/arch/arm64/boot/dts/freescale/imx8mp.dtsi
> b/arch/arm64/boot/dts/freescale/imx8mp.dtsi
> index 9f7c7f5..d113691 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mp.dtsi
> +++ b/arch/arm64/boot/dts/freescale/imx8mp.dtsi
> @@ -220,12 +220,10 @@
> };
>
> soc@0 {
> - compatible = "fsl,imx8mp-soc", "simple-bus";
> + compatible = "simple-bus";
> #address-cells = <1>;
> #size-cells = <1>;
> ranges = <0x0 0x0 0x0 0x3e000000>;
> - nvmem-cells = <&imx8mp_uid>;
> - nvmem-cell-names = "soc_unique_id";
>
> aips1: bus@30000000 {
> compatible = "fsl,aips-bus", "simple-bus"; @@ -341,7 +339,8
> @@
> };
>
> ocotp: efuse@30350000 {
> - compatible = "fsl,imx8mp-ocotp", "fsl,imx8mm-ocotp",
> "syscon";
> + compatible = "fsl,imx8mp-ocotp", "fsl,imx8mm-ocotp",
> "syscon",
> + "simple-mfd";
> reg = <0x30350000 0x10000>;
> clocks = <&clk IMX8MP_CLK_OCOTP_ROOT>;
> /* For nvmem subnodes */
> @@ -359,6 +358,12 @@
> eth_mac1: mac-address@90 {
> reg = <0x90 6>;
> };
> +
> + imx8mp_soc: imx8mp-soc {
> + compatible = "fsl,imx8mp-soc";
> + nvmem-cells = <&imx8mp_uid>;
> + nvmem-cell-names = "soc_unique_id";
> + };
> };
>
> anatop: anatop@30360000 {
> diff --git a/arch/arm64/boot/dts/freescale/imx8mq.dtsi
> b/arch/arm64/boot/dts/freescale/imx8mq.dtsi
> index 91df9c5..8cfbc77 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mq.dtsi
> +++ b/arch/arm64/boot/dts/freescale/imx8mq.dtsi
> @@ -287,13 +287,11 @@
> };
>
> soc@0 {
> - compatible = "fsl,imx8mq-soc", "simple-bus";
> + compatible = "simple-bus";
> #address-cells = <1>;
> #size-cells = <1>;
> ranges = <0x0 0x0 0x0 0x3e000000>;
> dma-ranges = <0x40000000 0x0 0x40000000 0xc0000000>;
> - nvmem-cells = <&imx8mq_uid>;
> - nvmem-cell-names = "soc_unique_id";
>
> bus@30000000 { /* AIPS1 */
> compatible = "fsl,aips-bus", "simple-bus"; @@ -554,7 +552,7
> @@
> };
>
> ocotp: efuse@30350000 {
> - compatible = "fsl,imx8mq-ocotp", "syscon";
> + compatible = "fsl,imx8mq-ocotp", "syscon", "simple-mfd";
> reg = <0x30350000 0x10000>;
> clocks = <&clk IMX8MQ_CLK_OCOTP_ROOT>;
> #address-cells = <1>;
> @@ -571,6 +569,12 @@
> fec_mac_address: mac-address@90 {
> reg = <0x90 6>;
> };
> +
> + imx8mq_soc: imx8mq-soc {
> + compatible = "fsl,imx8mq-soc";
> + nvmem-cells = <&imx8mq_uid>;
> + nvmem-cell-names = "soc_unique_id";
> + };
> };
>
> anatop: syscon@30360000 {
> --
> 2.7.4