2021-05-19 20:08:20

by Bhupesh Sharma

[permalink] [raw]
Subject: [PATCH v3 01/17] dt-bindings: qcom-bam: Convert binding to YAML

Convert Qualcomm BAM DMA devicetree binding to YAML.

Cc: Thara Gopinath <[email protected]>
Cc: Bjorn Andersson <[email protected]>
Cc: Rob Herring <[email protected]>
Cc: Andy Gross <[email protected]>
Cc: Herbert Xu <[email protected]>
Cc: David S. Miller <[email protected]>
Cc: Stephen Boyd <[email protected]>
Cc: Michael Turquette <[email protected]>
Cc: Vinod Koul <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Signed-off-by: Bhupesh Sharma <[email protected]>
---
.../devicetree/bindings/dma/qcom_bam_dma.txt | 50 ----------
.../devicetree/bindings/dma/qcom_bam_dma.yaml | 91 +++++++++++++++++++
2 files changed, 91 insertions(+), 50 deletions(-)
delete mode 100644 Documentation/devicetree/bindings/dma/qcom_bam_dma.txt
create mode 100644 Documentation/devicetree/bindings/dma/qcom_bam_dma.yaml

diff --git a/Documentation/devicetree/bindings/dma/qcom_bam_dma.txt b/Documentation/devicetree/bindings/dma/qcom_bam_dma.txt
deleted file mode 100644
index cf5b9e44432c..000000000000
--- a/Documentation/devicetree/bindings/dma/qcom_bam_dma.txt
+++ /dev/null
@@ -1,50 +0,0 @@
-QCOM BAM DMA controller
-
-Required properties:
-- compatible: must be one of the following:
- * "qcom,bam-v1.4.0" for MSM8974, APQ8074 and APQ8084
- * "qcom,bam-v1.3.0" for APQ8064, IPQ8064 and MSM8960
- * "qcom,bam-v1.7.0" for MSM8916
-- reg: Address range for DMA registers
-- interrupts: Should contain the one interrupt shared by all channels
-- #dma-cells: must be <1>, the cell in the dmas property of the client device
- represents the channel number
-- clocks: required clock
-- clock-names: must contain "bam_clk" entry
-- qcom,ee : indicates the active Execution Environment identifier (0-7) used in
- the secure world.
-- qcom,controlled-remotely : optional, indicates that the bam is controlled by
- remote proccessor i.e. execution environment.
-- num-channels : optional, indicates supported number of DMA channels in a
- remotely controlled bam.
-- qcom,num-ees : optional, indicates supported number of Execution Environments
- in a remotely controlled bam.
-
-Example:
-
- uart-bam: [email protected] = {
- compatible = "qcom,bam-v1.4.0";
- reg = <0xf9984000 0x15000>;
- interrupts = <0 94 0>;
- clocks = <&gcc GCC_BAM_DMA_AHB_CLK>;
- clock-names = "bam_clk";
- #dma-cells = <1>;
- qcom,ee = <0>;
- };
-
-DMA clients must use the format described in the dma.txt file, using a two cell
-specifier for each channel.
-
-Example:
- [email protected] {
- compatible = "qcom,msm-uart";
- reg = <0xf991e000 0x1000>
- <0xf9944000 0x19000>;
- interrupts = <0 108 0>;
- clocks = <&gcc GCC_BLSP1_UART2_APPS_CLK>,
- <&gcc GCC_BLSP1_AHB_CLK>;
- clock-names = "core", "iface";
-
- dmas = <&uart-bam 0>, <&uart-bam 1>;
- dma-names = "rx", "tx";
- };
diff --git a/Documentation/devicetree/bindings/dma/qcom_bam_dma.yaml b/Documentation/devicetree/bindings/dma/qcom_bam_dma.yaml
new file mode 100644
index 000000000000..173e4d7508a6
--- /dev/null
+++ b/Documentation/devicetree/bindings/dma/qcom_bam_dma.yaml
@@ -0,0 +1,91 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/dma/qcom_bam_dma.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: QCOM BAM DMA controller binding
+
+maintainers:
+ - Bhupesh Sharma <[email protected]>
+
+description: |
+ This document defines the binding for the BAM DMA controller
+ found on Qualcomm parts.
+
+allOf:
+ - $ref: "dma-controller.yaml#"
+
+properties:
+ compatible:
+ enum:
+ - qcom,bam-v1.4.0
+ - qcom,bam-v1.3.0
+ - qcom,bam-v1.7.0
+
+ reg:
+ maxItems: 1
+ description: Address range of the DMA registers.
+
+ clocks:
+ minItems: 1
+ maxItems: 8
+
+ clock-names:
+ const: bam_clk
+
+ interrupts:
+ maxItems: 1
+ description: Single interrupt line shared by all channels.
+
+ num-channels:
+ maxItems: 31
+ description: |
+ Indicates supported number of DMA channels in a remotely controlled bam.
+
+ "#dma-cells":
+ const: 1
+ description: The single cell represents the channel index.
+
+ qcom,ee:
+ $ref: /schemas/types.yaml#/definitions/uint8
+ description:
+ Indicates the active Execution Environment identifier (0-7)
+ used in the secure world.
+ enum: [0, 1, 2, 3, 4, 5, 6, 7]
+
+ qcom,controlled-remotely:
+ $ref: /schemas/types.yaml#/definitions/flag
+ description:
+ Indicates that the bam is controlled by remote proccessor i.e.
+ execution environment.
+
+ qcom,num-ees:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ Indicates supported number of Execution Environments in a
+ remotely controlled bam.
+
+required:
+ - compatible
+ - reg
+ - interrupts
+ - clocks
+ - clock-names
+ - "#dma-cells"
+ - qcom,ee
+
+additionalProperties: false
+
+examples:
+ - |
+ #include <dt-bindings/clock/qcom,gcc-msm8974.h>
+ [email protected] {
+ compatible = "qcom,bam-v1.4.0";
+ reg = <0xf9984000 0x15000>;
+ interrupts = <0 94 0>;
+ clocks = <&gcc GCC_BAM_DMA_AHB_CLK>;
+ clock-names = "bam_clk";
+ #dma-cells = <1>;
+ qcom,ee = /bits/ 8 <0>;
+ };
--
2.31.1



2021-05-21 09:07:08

by Rob Herring

[permalink] [raw]
Subject: Re: [PATCH v3 01/17] dt-bindings: qcom-bam: Convert binding to YAML

On Wed, May 19, 2021 at 08:06:44PM +0530, Bhupesh Sharma wrote:
> Convert Qualcomm BAM DMA devicetree binding to YAML.
>
> Cc: Thara Gopinath <[email protected]>
> Cc: Bjorn Andersson <[email protected]>
> Cc: Rob Herring <[email protected]>
> Cc: Andy Gross <[email protected]>
> Cc: Herbert Xu <[email protected]>
> Cc: David S. Miller <[email protected]>
> Cc: Stephen Boyd <[email protected]>
> Cc: Michael Turquette <[email protected]>
> Cc: Vinod Koul <[email protected]>
> Cc: [email protected]
> Cc: [email protected]
> Cc: [email protected]
> Cc: [email protected]
> Cc: [email protected]
> Cc: [email protected]
> Signed-off-by: Bhupesh Sharma <[email protected]>
> ---
> .../devicetree/bindings/dma/qcom_bam_dma.txt | 50 ----------
> .../devicetree/bindings/dma/qcom_bam_dma.yaml | 91 +++++++++++++++++++
> 2 files changed, 91 insertions(+), 50 deletions(-)
> delete mode 100644 Documentation/devicetree/bindings/dma/qcom_bam_dma.txt
> create mode 100644 Documentation/devicetree/bindings/dma/qcom_bam_dma.yaml
>
> diff --git a/Documentation/devicetree/bindings/dma/qcom_bam_dma.txt b/Documentation/devicetree/bindings/dma/qcom_bam_dma.txt
> deleted file mode 100644
> index cf5b9e44432c..000000000000
> --- a/Documentation/devicetree/bindings/dma/qcom_bam_dma.txt
> +++ /dev/null
> @@ -1,50 +0,0 @@
> -QCOM BAM DMA controller
> -
> -Required properties:
> -- compatible: must be one of the following:
> - * "qcom,bam-v1.4.0" for MSM8974, APQ8074 and APQ8084
> - * "qcom,bam-v1.3.0" for APQ8064, IPQ8064 and MSM8960
> - * "qcom,bam-v1.7.0" for MSM8916
> -- reg: Address range for DMA registers
> -- interrupts: Should contain the one interrupt shared by all channels
> -- #dma-cells: must be <1>, the cell in the dmas property of the client device
> - represents the channel number
> -- clocks: required clock
> -- clock-names: must contain "bam_clk" entry
> -- qcom,ee : indicates the active Execution Environment identifier (0-7) used in
> - the secure world.
> -- qcom,controlled-remotely : optional, indicates that the bam is controlled by
> - remote proccessor i.e. execution environment.
> -- num-channels : optional, indicates supported number of DMA channels in a
> - remotely controlled bam.
> -- qcom,num-ees : optional, indicates supported number of Execution Environments
> - in a remotely controlled bam.
> -
> -Example:
> -
> - uart-bam: [email protected] = {
> - compatible = "qcom,bam-v1.4.0";
> - reg = <0xf9984000 0x15000>;
> - interrupts = <0 94 0>;
> - clocks = <&gcc GCC_BAM_DMA_AHB_CLK>;
> - clock-names = "bam_clk";
> - #dma-cells = <1>;
> - qcom,ee = <0>;
> - };
> -
> -DMA clients must use the format described in the dma.txt file, using a two cell
> -specifier for each channel.
> -
> -Example:
> - [email protected] {
> - compatible = "qcom,msm-uart";
> - reg = <0xf991e000 0x1000>
> - <0xf9944000 0x19000>;
> - interrupts = <0 108 0>;
> - clocks = <&gcc GCC_BLSP1_UART2_APPS_CLK>,
> - <&gcc GCC_BLSP1_AHB_CLK>;
> - clock-names = "core", "iface";
> -
> - dmas = <&uart-bam 0>, <&uart-bam 1>;
> - dma-names = "rx", "tx";
> - };
> diff --git a/Documentation/devicetree/bindings/dma/qcom_bam_dma.yaml b/Documentation/devicetree/bindings/dma/qcom_bam_dma.yaml
> new file mode 100644
> index 000000000000..173e4d7508a6
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/dma/qcom_bam_dma.yaml
> @@ -0,0 +1,91 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/dma/qcom_bam_dma.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: QCOM BAM DMA controller binding
> +
> +maintainers:
> + - Bhupesh Sharma <[email protected]>
> +
> +description: |
> + This document defines the binding for the BAM DMA controller
> + found on Qualcomm parts.
> +
> +allOf:
> + - $ref: "dma-controller.yaml#"
> +
> +properties:
> + compatible:
> + enum:
> + - qcom,bam-v1.4.0
> + - qcom,bam-v1.3.0
> + - qcom,bam-v1.7.0

Can we keep the SoC association please.

> +
> + reg:
> + maxItems: 1
> + description: Address range of the DMA registers.

Drop description.

> +
> + clocks:
> + minItems: 1
> + maxItems: 8
> +
> + clock-names:
> + const: bam_clk

This is going to fail if you try more than 1 clock.

> +
> + interrupts:
> + maxItems: 1
> + description: Single interrupt line shared by all channels.

Drop description

> +
> + num-channels:
> + maxItems: 31
> + description: |
> + Indicates supported number of DMA channels in a remotely controlled bam.
> +
> + "#dma-cells":
> + const: 1
> + description: The single cell represents the channel index.
> +
> + qcom,ee:
> + $ref: /schemas/types.yaml#/definitions/uint8
> + description:
> + Indicates the active Execution Environment identifier (0-7)
> + used in the secure world.
> + enum: [0, 1, 2, 3, 4, 5, 6, 7]
> +
> + qcom,controlled-remotely:
> + $ref: /schemas/types.yaml#/definitions/flag
> + description:
> + Indicates that the bam is controlled by remote proccessor i.e.
> + execution environment.
> +
> + qcom,num-ees:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description:
> + Indicates supported number of Execution Environments in a
> + remotely controlled bam.

0-2^32 is valid?

> +
> +required:
> + - compatible
> + - reg
> + - interrupts
> + - clocks
> + - clock-names
> + - "#dma-cells"
> + - qcom,ee
> +
> +additionalProperties: false
> +
> +examples:
> + - |
> + #include <dt-bindings/clock/qcom,gcc-msm8974.h>
> + [email protected] {
> + compatible = "qcom,bam-v1.4.0";
> + reg = <0xf9984000 0x15000>;
> + interrupts = <0 94 0>;
> + clocks = <&gcc GCC_BAM_DMA_AHB_CLK>;
> + clock-names = "bam_clk";
> + #dma-cells = <1>;
> + qcom,ee = /bits/ 8 <0>;
> + };
> --
> 2.31.1
>

2021-06-04 03:29:10

by Bhupesh Sharma

[permalink] [raw]
Subject: Re: [PATCH v3 01/17] dt-bindings: qcom-bam: Convert binding to YAML

Hello Rob,

Thanks for the review and sorry for the late reply.

On Fri, 21 May 2021 at 07:13, Rob Herring <[email protected]> wrote:
>
> On Wed, May 19, 2021 at 08:06:44PM +0530, Bhupesh Sharma wrote:
> > Convert Qualcomm BAM DMA devicetree binding to YAML.
> >
> > Cc: Thara Gopinath <[email protected]>
> > Cc: Bjorn Andersson <[email protected]>
> > Cc: Rob Herring <[email protected]>
> > Cc: Andy Gross <[email protected]>
> > Cc: Herbert Xu <[email protected]>
> > Cc: David S. Miller <[email protected]>
> > Cc: Stephen Boyd <[email protected]>
> > Cc: Michael Turquette <[email protected]>
> > Cc: Vinod Koul <[email protected]>
> > Cc: [email protected]
> > Cc: [email protected]
> > Cc: [email protected]
> > Cc: [email protected]
> > Cc: [email protected]
> > Cc: [email protected]
> > Signed-off-by: Bhupesh Sharma <[email protected]>
> > ---
> > .../devicetree/bindings/dma/qcom_bam_dma.txt | 50 ----------
> > .../devicetree/bindings/dma/qcom_bam_dma.yaml | 91 +++++++++++++++++++
> > 2 files changed, 91 insertions(+), 50 deletions(-)
> > delete mode 100644 Documentation/devicetree/bindings/dma/qcom_bam_dma.txt
> > create mode 100644 Documentation/devicetree/bindings/dma/qcom_bam_dma.yaml
> >
> > diff --git a/Documentation/devicetree/bindings/dma/qcom_bam_dma.txt b/Documentation/devicetree/bindings/dma/qcom_bam_dma.txt
> > deleted file mode 100644
> > index cf5b9e44432c..000000000000
> > --- a/Documentation/devicetree/bindings/dma/qcom_bam_dma.txt
> > +++ /dev/null
> > @@ -1,50 +0,0 @@
> > -QCOM BAM DMA controller
> > -
> > -Required properties:
> > -- compatible: must be one of the following:
> > - * "qcom,bam-v1.4.0" for MSM8974, APQ8074 and APQ8084
> > - * "qcom,bam-v1.3.0" for APQ8064, IPQ8064 and MSM8960
> > - * "qcom,bam-v1.7.0" for MSM8916
> > -- reg: Address range for DMA registers
> > -- interrupts: Should contain the one interrupt shared by all channels
> > -- #dma-cells: must be <1>, the cell in the dmas property of the client device
> > - represents the channel number
> > -- clocks: required clock
> > -- clock-names: must contain "bam_clk" entry
> > -- qcom,ee : indicates the active Execution Environment identifier (0-7) used in
> > - the secure world.
> > -- qcom,controlled-remotely : optional, indicates that the bam is controlled by
> > - remote proccessor i.e. execution environment.
> > -- num-channels : optional, indicates supported number of DMA channels in a
> > - remotely controlled bam.
> > -- qcom,num-ees : optional, indicates supported number of Execution Environments
> > - in a remotely controlled bam.
> > -
> > -Example:
> > -
> > - uart-bam: [email protected] = {
> > - compatible = "qcom,bam-v1.4.0";
> > - reg = <0xf9984000 0x15000>;
> > - interrupts = <0 94 0>;
> > - clocks = <&gcc GCC_BAM_DMA_AHB_CLK>;
> > - clock-names = "bam_clk";
> > - #dma-cells = <1>;
> > - qcom,ee = <0>;
> > - };
> > -
> > -DMA clients must use the format described in the dma.txt file, using a two cell
> > -specifier for each channel.
> > -
> > -Example:
> > - [email protected] {
> > - compatible = "qcom,msm-uart";
> > - reg = <0xf991e000 0x1000>
> > - <0xf9944000 0x19000>;
> > - interrupts = <0 108 0>;
> > - clocks = <&gcc GCC_BLSP1_UART2_APPS_CLK>,
> > - <&gcc GCC_BLSP1_AHB_CLK>;
> > - clock-names = "core", "iface";
> > -
> > - dmas = <&uart-bam 0>, <&uart-bam 1>;
> > - dma-names = "rx", "tx";
> > - };
> > diff --git a/Documentation/devicetree/bindings/dma/qcom_bam_dma.yaml b/Documentation/devicetree/bindings/dma/qcom_bam_dma.yaml
> > new file mode 100644
> > index 000000000000..173e4d7508a6
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/dma/qcom_bam_dma.yaml
> > @@ -0,0 +1,91 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/dma/qcom_bam_dma.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: QCOM BAM DMA controller binding
> > +
> > +maintainers:
> > + - Bhupesh Sharma <[email protected]>
> > +
> > +description: |
> > + This document defines the binding for the BAM DMA controller
> > + found on Qualcomm parts.
> > +
> > +allOf:
> > + - $ref: "dma-controller.yaml#"
> > +
> > +properties:
> > + compatible:
> > + enum:
> > + - qcom,bam-v1.4.0
> > + - qcom,bam-v1.3.0
> > + - qcom,bam-v1.7.0
>
> Can we keep the SoC association please.

The original bam dma bindings are as per the underlying bam IP
version, so I would prefer that we keep it this way for this series.

Later on I can send a patchset to convert the bam DMA dt-bindings, dts
and driver to work with 'SoC association' instead.

> > +
> > + reg:
> > + maxItems: 1
> > + description: Address range of the DMA registers.
>
> Drop description.

Sure.

> > +
> > + clocks:
> > + minItems: 1
> > + maxItems: 8
> > +
> > + clock-names:
> > + const: bam_clk
>
> This is going to fail if you try more than 1 clock.

Right, currently we have one clock, but I can recheck and make fixes in v4.

> > +
> > + interrupts:
> > + maxItems: 1
> > + description: Single interrupt line shared by all channels.
>
> Drop description

Ok.

> > +
> > + num-channels:
> > + maxItems: 31
> > + description: |
> > + Indicates supported number of DMA channels in a remotely controlled bam.
> > +
> > + "#dma-cells":
> > + const: 1
> > + description: The single cell represents the channel index.
> > +
> > + qcom,ee:
> > + $ref: /schemas/types.yaml#/definitions/uint8
> > + description:
> > + Indicates the active Execution Environment identifier (0-7)
> > + used in the secure world.
> > + enum: [0, 1, 2, 3, 4, 5, 6, 7]
> > +
> > + qcom,controlled-remotely:
> > + $ref: /schemas/types.yaml#/definitions/flag
> > + description:
> > + Indicates that the bam is controlled by remote proccessor i.e.
> > + execution environment.
> > +
> > + qcom,num-ees:
> > + $ref: /schemas/types.yaml#/definitions/uint32
> > + description:
> > + Indicates supported number of Execution Environments in a
> > + remotely controlled bam.
>
> 0-2^32 is valid?

Oh, got it. Will fix it in v4.

> > +
> > +required:
> > + - compatible
> > + - reg
> > + - interrupts
> > + - clocks
> > + - clock-names
> > + - "#dma-cells"
> > + - qcom,ee
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > + - |
> > + #include <dt-bindings/clock/qcom,gcc-msm8974.h>
> > + [email protected] {
> > + compatible = "qcom,bam-v1.4.0";
> > + reg = <0xf9984000 0x15000>;
> > + interrupts = <0 94 0>;
> > + clocks = <&gcc GCC_BAM_DMA_AHB_CLK>;
> > + clock-names = "bam_clk";
> > + #dma-cells = <1>;
> > + qcom,ee = /bits/ 8 <0>;
> > + };
> > --
> > 2.31.1

Thanks,
Bhupesh

2021-06-04 03:42:45

by Bhupesh Sharma

[permalink] [raw]
Subject: Re: [PATCH v3 01/17] dt-bindings: qcom-bam: Convert binding to YAML

Hi Stephan,

Thanks for the review.

On Fri, 21 May 2021 at 13:41, Stephan Gerhold <[email protected]> wrote:
>
> Hi,
>
> On Wed, May 19, 2021 at 08:06:44PM +0530, Bhupesh Sharma wrote:
> > Convert Qualcomm BAM DMA devicetree binding to YAML.
> >
> > Cc: Thara Gopinath <[email protected]>
> > Cc: Bjorn Andersson <[email protected]>
> > Cc: Rob Herring <[email protected]>
> > Cc: Andy Gross <[email protected]>
> > Cc: Herbert Xu <[email protected]>
> > Cc: David S. Miller <[email protected]>
> > Cc: Stephen Boyd <[email protected]>
> > Cc: Michael Turquette <[email protected]>
> > Cc: Vinod Koul <[email protected]>
> > Cc: [email protected]
> > Cc: [email protected]
> > Cc: [email protected]
> > Cc: [email protected]
> > Cc: [email protected]
> > Cc: [email protected]
> > Signed-off-by: Bhupesh Sharma <[email protected]>
> > ---
> > .../devicetree/bindings/dma/qcom_bam_dma.txt | 50 ----------
> > .../devicetree/bindings/dma/qcom_bam_dma.yaml | 91 +++++++++++++++++++
> > 2 files changed, 91 insertions(+), 50 deletions(-)
> > delete mode 100644 Documentation/devicetree/bindings/dma/qcom_bam_dma.txt
> > create mode 100644 Documentation/devicetree/bindings/dma/qcom_bam_dma.yaml
> >
> > diff --git a/Documentation/devicetree/bindings/dma/qcom_bam_dma.txt b/Documentation/devicetree/bindings/dma/qcom_bam_dma.txt
> > deleted file mode 100644
> > index cf5b9e44432c..000000000000
> > --- a/Documentation/devicetree/bindings/dma/qcom_bam_dma.txt
> > +++ /dev/null
> > @@ -1,50 +0,0 @@
> > -QCOM BAM DMA controller
> > -
> > -Required properties:
> > -- compatible: must be one of the following:
> > - * "qcom,bam-v1.4.0" for MSM8974, APQ8074 and APQ8084
> > - * "qcom,bam-v1.3.0" for APQ8064, IPQ8064 and MSM8960
> > - * "qcom,bam-v1.7.0" for MSM8916
> > -- reg: Address range for DMA registers
> > -- interrupts: Should contain the one interrupt shared by all channels
> > -- #dma-cells: must be <1>, the cell in the dmas property of the client device
> > - represents the channel number
> > -- clocks: required clock
> > -- clock-names: must contain "bam_clk" entry
> > -- qcom,ee : indicates the active Execution Environment identifier (0-7) used in
> > - the secure world.
> > -- qcom,controlled-remotely : optional, indicates that the bam is controlled by
> > - remote proccessor i.e. execution environment.
> > -- num-channels : optional, indicates supported number of DMA channels in a
> > - remotely controlled bam.
> > -- qcom,num-ees : optional, indicates supported number of Execution Environments
> > - in a remotely controlled bam.
> > -
> > -Example:
> > -
> > - uart-bam: [email protected] = {
> > - compatible = "qcom,bam-v1.4.0";
> > - reg = <0xf9984000 0x15000>;
> > - interrupts = <0 94 0>;
> > - clocks = <&gcc GCC_BAM_DMA_AHB_CLK>;
> > - clock-names = "bam_clk";
> > - #dma-cells = <1>;
> > - qcom,ee = <0>;
> > - };
> > -
> > -DMA clients must use the format described in the dma.txt file, using a two cell
> > -specifier for each channel.
> > -
> > -Example:
> > - [email protected] {
> > - compatible = "qcom,msm-uart";
> > - reg = <0xf991e000 0x1000>
> > - <0xf9944000 0x19000>;
> > - interrupts = <0 108 0>;
> > - clocks = <&gcc GCC_BLSP1_UART2_APPS_CLK>,
> > - <&gcc GCC_BLSP1_AHB_CLK>;
> > - clock-names = "core", "iface";
> > -
> > - dmas = <&uart-bam 0>, <&uart-bam 1>;
> > - dma-names = "rx", "tx";
> > - };
> > diff --git a/Documentation/devicetree/bindings/dma/qcom_bam_dma.yaml b/Documentation/devicetree/bindings/dma/qcom_bam_dma.yaml
> > new file mode 100644
> > index 000000000000..173e4d7508a6
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/dma/qcom_bam_dma.yaml
> > @@ -0,0 +1,91 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/dma/qcom_bam_dma.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: QCOM BAM DMA controller binding
> > +
> > +maintainers:
> > + - Bhupesh Sharma <[email protected]>
> > +
> > +description: |
> > + This document defines the binding for the BAM DMA controller
> > + found on Qualcomm parts.
> > +
> > +allOf:
> > + - $ref: "dma-controller.yaml#"
> > +
> > +properties:
> > + compatible:
> > + enum:
> > + - qcom,bam-v1.4.0
> > + - qcom,bam-v1.3.0
> > + - qcom,bam-v1.7.0
> > +
> > + reg:
> > + maxItems: 1
> > + description: Address range of the DMA registers.
> > +
> > + clocks:
> > + minItems: 1
> > + maxItems: 8
> > +
> > + clock-names:
> > + const: bam_clk
> > +
> > + interrupts:
> > + maxItems: 1
> > + description: Single interrupt line shared by all channels.
> > +
> > + num-channels:
> > + maxItems: 31
>
> maxItems doesn't seem right here, since num-channels isn't an array.
> Perhaps you meant maximum: 31?
>
> Can you check your bindings on the existing device trees with
> "make dtbs_check" and make sure that only reasonable errors remain?
>
> This fails on pretty much every device tree:
>
> arch/arm64/boot/dts/qcom/apq8096-db820c.dt.yaml: [email protected]: num-channels: [[31]] is too short
> From schema: Documentation/devicetree/bindings/dma/qcom_bam_dma.yaml

I did run "make dtbs_check" and I don't remember seeing the issues you reported.
Hmm.. maybe I missed something. Let me recheck and fix issues in v4.

> > + description: |
> > + Indicates supported number of DMA channels in a remotely controlled bam.
> > +
> > + "#dma-cells":
> > + const: 1
> > + description: The single cell represents the channel index.
> > +
> > + qcom,ee:
> > + $ref: /schemas/types.yaml#/definitions/uint8
> > + description:
> > + Indicates the active Execution Environment identifier (0-7)
> > + used in the secure world.
> > + enum: [0, 1, 2, 3, 4, 5, 6, 7]
> > +
>
> bam_dma.c reads this as uint32 and all existing device tree specify it
> as uint32. I don't think adding the /bits/ 8 to all existing device
> trees is really worth it.
>
> arch/arm64/boot/dts/qcom/apq8096-db820c.dt.yaml: [email protected]: qcom,ee: missing size tag in [[1]]
> From schema: Documentation/devicetree/bindings/dma/qcom_bam_dma.yaml

Ok.

> > + qcom,controlled-remotely:
> > + $ref: /schemas/types.yaml#/definitions/flag
> > + description:
> > + Indicates that the bam is controlled by remote proccessor i.e.
> > + execution environment.
> > +
> > + qcom,num-ees:
> > + $ref: /schemas/types.yaml#/definitions/uint32
> > + description:
> > + Indicates supported number of Execution Environments in a
> > + remotely controlled bam.
> > +
> > +required:
> > + - compatible
> > + - reg
> > + - interrupts
> > + - clocks
> > + - clock-names
>
> clocks is often missing if qcom,controlled-remotely is set, e.g.
>
> slimbam: [email protected] {
> compatible = "qcom,bam-v1.7.0";
> qcom,controlled-remotely;
> reg = <0x09184000 0x32000>;
> num-channels = <31>;
> interrupts = <0 164 IRQ_TYPE_LEVEL_HIGH>;
> #dma-cells = <1>;
> qcom,ee = <1>;
> qcom,num-ees = <2>;
> };
>
> arch/arm64/boot/dts/qcom/apq8096-db820c.dt.yaml: [email protected]: 'clocks' is a required property
> From schema: Documentation/devicetree/bindings/dma/qcom_bam_dma.yaml
> arch/arm64/boot/dts/qcom/apq8096-db820c.dt.yaml: [email protected]: 'clock-names' is a required property
> From schema: Documentation/devicetree/bindings/dma/qcom_bam_dma.yaml
>
> You might be able to encode this with an if: statement (clocks required
> if qcom,controlled-remotely not specified), not sure.

Ok.

Thanks,
Bhupesh