2024-01-19 06:33:03

by Jason-JH.Lin

[permalink] [raw]
Subject: [PATCH v3 1/3] dt-bindings: mailbox: Add mediatek,gce-props.yaml

Add mediatek,gce-props.yaml for common GCE properties that is used for
both mailbox providers and consumers. We place the common property
"mediatek,gce-events" in this binding currently.

The property "mediatek,gce-events" is used for GCE event ID corresponding
to a hardware event signal sent by the hardware or a sofware driver.
If the mailbox providers or consumers want to manipulate the value of
the event ID, they need to know the specific event ID.

Signed-off-by: Jason-JH.Lin <[email protected]>
---
.../bindings/mailbox/mediatek,gce-props.yaml | 52 +++++++++++++++++++
1 file changed, 52 insertions(+)
create mode 100644 Documentation/devicetree/bindings/mailbox/mediatek,gce-props.yaml

diff --git a/Documentation/devicetree/bindings/mailbox/mediatek,gce-props.yaml b/Documentation/devicetree/bindings/mailbox/mediatek,gce-props.yaml
new file mode 100644
index 000000000000..68b519ff089f
--- /dev/null
+++ b/Documentation/devicetree/bindings/mailbox/mediatek,gce-props.yaml
@@ -0,0 +1,52 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mailbox/mediatek,gce-props.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: MediaTek Global Command Engine Common Propertes
+
+maintainers:
+ - Houlong Wei <[email protected]>
+
+description:
+ The Global Command Engine (GCE) is an instruction based, multi-threaded,
+ single-core command dispatcher for MediaTek hardware. The Command Queue
+ (CMDQ) mailbox driver is a driver for GCE, implemented using the Linux
+ mailbox framework. It is used to receive messages from mailbox consumers
+ and configure GCE to execute the specified instruction set in the message.
+ We use mediatek,gce-mailbox.yaml to define the properties for CMDQ mailbox
+ driver. A device driver that uses the CMDQ driver to configure its hardware
+ registers is a mailbox consumer. The mailbox consumer can request a mailbox
+ channel corresponding to a GCE hardware thread to send a message, specifying
+ that the GCE thread to configure its hardware. The mailbox provider can also
+ reserved a mailbox channel to configure GCE hardware register by the spcific
+ GCE thread. This binding defines the common GCE properties for both mailbox
+ provider and consumers.
+
+properties:
+ mediatek,gce-events:
+ description:
+ GCE has an event table in SRAM, consisting of 1024 event IDs (0~1023).
+ Each event ID has a boolean event value with the default value 0.
+ The property mediatek,gce-events is used to obtain the event IDs.
+ Some gce-events are hardware-bound and cannot be changed by software.
+ For instance, in MT8195, when VDO0_MUTEX is stream done, VDO_MUTEX will
+ send an event signal to GCE, setting the value of event ID 597 to 1.
+ Similarly, in MT8188, the value of event ID 574 will be set to 1 when
+ VOD0_MUTEX is stream done.
+ On the other hand, some gce-events are not hardware-bound and can be
+ changed by software. For example, in MT8188, we can set the value of
+ event ID 855, which is not bound to any hardware, to 1 when the driver
+ in the secure world completes a task. However, in MT8195, event ID 855
+ is already bound to VDEC_LAT1, so we need to select another event ID to
+ achieve the same purpose. This event ID can be any ID that is not bound
+ to any hardware and is not yet used in any software driver.
+ To determine if the event ID is bound to the hardware or used by a
+ software driver, refer to the GCE header
+ include/dt-bindings/gce/<chip>-gce.h of each chip.
+ $ref: /schemas/types.yaml#/definitions/uint32-array
+ minItems: 1
+ maxItems: 1024
+
+additionalProperties: true
--
2.18.0



Subject: Re: [PATCH v3 1/3] dt-bindings: mailbox: Add mediatek,gce-props.yaml

Il 19/01/24 07:32, Jason-JH.Lin ha scritto:
> Add mediatek,gce-props.yaml for common GCE properties that is used for
> both mailbox providers and consumers. We place the common property
> "mediatek,gce-events" in this binding currently.
>
> The property "mediatek,gce-events" is used for GCE event ID corresponding
> to a hardware event signal sent by the hardware or a sofware driver.
> If the mailbox providers or consumers want to manipulate the value of
> the event ID, they need to know the specific event ID.
>
> Signed-off-by: Jason-JH.Lin <[email protected]>
> ---
> .../bindings/mailbox/mediatek,gce-props.yaml | 52 +++++++++++++++++++
> 1 file changed, 52 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/mailbox/mediatek,gce-props.yaml
>
> diff --git a/Documentation/devicetree/bindings/mailbox/mediatek,gce-props.yaml b/Documentation/devicetree/bindings/mailbox/mediatek,gce-props.yaml
> new file mode 100644
> index 000000000000..68b519ff089f
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mailbox/mediatek,gce-props.yaml
> @@ -0,0 +1,52 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/mailbox/mediatek,gce-props.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: MediaTek Global Command Engine Common Propertes
> +
> +maintainers:
> + - Houlong Wei <[email protected]>
> +
> +description:
> + The Global Command Engine (GCE) is an instruction based, multi-threaded,
> + single-core command dispatcher for MediaTek hardware. The Command Queue
> + (CMDQ) mailbox driver is a driver for GCE, implemented using the Linux
> + mailbox framework. It is used to receive messages from mailbox consumers
> + and configure GCE to execute the specified instruction set in the message.
> + We use mediatek,gce-mailbox.yaml to define the properties for CMDQ mailbox
> + driver. A device driver that uses the CMDQ driver to configure its hardware
> + registers is a mailbox consumer. The mailbox consumer can request a mailbox
> + channel corresponding to a GCE hardware thread to send a message, specifying
> + that the GCE thread to configure its hardware. The mailbox provider can also
> + reserved a mailbox channel to configure GCE hardware register by the spcific
> + GCE thread. This binding defines the common GCE properties for both mailbox
> + provider and consumers.
> +
> +properties:
> + mediatek,gce-events:
> + description:
> + GCE has an event table in SRAM, consisting of 1024 event IDs (0~1023).
> + Each event ID has a boolean event value with the default value 0.
> + The property mediatek,gce-events is used to obtain the event IDs.
> + Some gce-events are hardware-bound and cannot be changed by software.
> + For instance, in MT8195, when VDO0_MUTEX is stream done, VDO_MUTEX will
> + send an event signal to GCE, setting the value of event ID 597 to 1.
> + Similarly, in MT8188, the value of event ID 574 will be set to 1 when
> + VOD0_MUTEX is stream done.
> + On the other hand, some gce-events are not hardware-bound and can be
> + changed by software. For example, in MT8188, we can set the value of
> + event ID 855, which is not bound to any hardware, to 1 when the driver
> + in the secure world completes a task. However, in MT8195, event ID 855
> + is already bound to VDEC_LAT1, so we need to select another event ID to
> + achieve the same purpose. This event ID can be any ID that is not bound
> + to any hardware and is not yet used in any software driver.
> + To determine if the event ID is bound to the hardware or used by a
> + software driver, refer to the GCE header
> + include/dt-bindings/gce/<chip>-gce.h of each chip.
> + $ref: /schemas/types.yaml#/definitions/uint32-array
> + minItems: 1
> + maxItems: 1024

maxItems: 1024 seems to be a bit too many... this means that one devicetree node
may have up to 1024 gce events, which is impossible! If a driver needed all of
the 1024 events, this means that it's not an user of the GCE, but the GCE itself!

Imagine seeing a devicetree node with 1024 array entries for mediatek,gce-events...

I'd set that to a more sensible value of 32 - eventually we can extend it later,
if ever needed.

Besides, nice job about all this documentation of the GCE and its events: love it!

Cheers,
Angelo


2024-01-19 16:44:23

by Conor Dooley

[permalink] [raw]
Subject: Re: [PATCH v3 1/3] dt-bindings: mailbox: Add mediatek,gce-props.yaml

Rob,

On Fri, Jan 19, 2024 at 02:32:22PM +0800, Jason-JH.Lin wrote:
> Add mediatek,gce-props.yaml for common GCE properties that is used for
> both mailbox providers and consumers. We place the common property
> "mediatek,gce-events" in this binding currently.
>
> The property "mediatek,gce-events" is used for GCE event ID corresponding
> to a hardware event signal sent by the hardware or a sofware driver.
> If the mailbox providers or consumers want to manipulate the value of
> the event ID, they need to know the specific event ID.
>
> Signed-off-by: Jason-JH.Lin <[email protected]>
> ---
> .../bindings/mailbox/mediatek,gce-props.yaml | 52 +++++++++++++++++++

Is bindings/mailbox the correct directory to put this in?

> 1 file changed, 52 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/mailbox/mediatek,gce-props.yaml
>
> diff --git a/Documentation/devicetree/bindings/mailbox/mediatek,gce-props.yaml b/Documentation/devicetree/bindings/mailbox/mediatek,gce-props.yaml
> new file mode 100644
> index 000000000000..68b519ff089f
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mailbox/mediatek,gce-props.yaml
> @@ -0,0 +1,52 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/mailbox/mediatek,gce-props.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: MediaTek Global Command Engine Common Propertes
> +
> +maintainers:
> + - Houlong Wei <[email protected]>
> +
> +description:
> + The Global Command Engine (GCE) is an instruction based, multi-threaded,
> + single-core command dispatcher for MediaTek hardware. The Command Queue
> + (CMDQ) mailbox driver is a driver for GCE, implemented using the Linux
> + mailbox framework. It is used to receive messages from mailbox consumers
> + and configure GCE to execute the specified instruction set in the message.
> + We use mediatek,gce-mailbox.yaml to define the properties for CMDQ mailbox
> + driver. A device driver that uses the CMDQ driver to configure its hardware
> + registers is a mailbox consumer. The mailbox consumer can request a mailbox
> + channel corresponding to a GCE hardware thread to send a message, specifying
> + that the GCE thread to configure its hardware. The mailbox provider can also
> + reserved a mailbox channel to configure GCE hardware register by the spcific
> + GCE thread. This binding defines the common GCE properties for both mailbox
> + provider and consumers.
> +
> +properties:
> + mediatek,gce-events:
> + description:
> + GCE has an event table in SRAM, consisting of 1024 event IDs (0~1023).
> + Each event ID has a boolean event value with the default value 0.
> + The property mediatek,gce-events is used to obtain the event IDs.
> + Some gce-events are hardware-bound and cannot be changed by software.
> + For instance, in MT8195, when VDO0_MUTEX is stream done, VDO_MUTEX will
> + send an event signal to GCE, setting the value of event ID 597 to 1.
> + Similarly, in MT8188, the value of event ID 574 will be set to 1 when
> + VOD0_MUTEX is stream done.
> + On the other hand, some gce-events are not hardware-bound and can be
> + changed by software. For example, in MT8188, we can set the value of
> + event ID 855, which is not bound to any hardware, to 1 when the driver
> + in the secure world completes a task. However, in MT8195, event ID 855
> + is already bound to VDEC_LAT1, so we need to select another event ID to
> + achieve the same purpose. This event ID can be any ID that is not bound
> + to any hardware and is not yet used in any software driver.
> + To determine if the event ID is bound to the hardware or used by a
> + software driver, refer to the GCE header
> + include/dt-bindings/gce/<chip>-gce.h of each chip.
> + $ref: /schemas/types.yaml#/definitions/uint32-array
> + minItems: 1
> + maxItems: 1024
> +
> +additionalProperties: true
> --
> 2.18.0
>


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2024-01-20 09:48:58

by Jason-JH.Lin

[permalink] [raw]
Subject: Re: [PATCH v3 1/3] dt-bindings: mailbox: Add mediatek,gce-props.yaml

Hi Angelo,

Thanks for the reviews.

On Fri, 2024-01-19 at 11:53 +0100, AngeloGioacchino Del Regno wrote:
> Il 19/01/24 07:32, Jason-JH.Lin ha scritto:
> > Add mediatek,gce-props.yaml for common GCE properties that is used
> > for
> > both mailbox providers and consumers. We place the common property
> > "mediatek,gce-events" in this binding currently.
> >
> > The property "mediatek,gce-events" is used for GCE event ID
> > corresponding
> > to a hardware event signal sent by the hardware or a sofware
> > driver.
> > If the mailbox providers or consumers want to manipulate the value
> > of
> > the event ID, they need to know the specific event ID.
> >
> > Signed-off-by: Jason-JH.Lin <[email protected]>
> > ---
> > .../bindings/mailbox/mediatek,gce-props.yaml | 52
> > +++++++++++++++++++
> > 1 file changed, 52 insertions(+)
> > create mode 100644
> > Documentation/devicetree/bindings/mailbox/mediatek,gce-props.yaml
> >
> > diff --git
> > a/Documentation/devicetree/bindings/mailbox/mediatek,gce-props.yaml
> > b/Documentation/devicetree/bindings/mailbox/mediatek,gce-props.yaml
> > new file mode 100644
> > index 000000000000..68b519ff089f
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/mailbox/mediatek,gce-
> > props.yaml
> > @@ -0,0 +1,52 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id:
> > https://urldefense.com/v3/__http://devicetree.org/schemas/mailbox/mediatek,gce-props.yaml*__;Iw!!CTRNKA9wMg0ARbw!kMCkhwQ_az8HouSQgqMuDC5QpKFizQrWMlwaWPfYp1GphlueXVfPfS9FA83806_7K_qqcfHOaprqAWNOoBkzsTJNUSZpugRS_Q$
> >
> > +$schema:
> > https://urldefense.com/v3/__http://devicetree.org/meta-schemas/core.yaml*__;Iw!!CTRNKA9wMg0ARbw!kMCkhwQ_az8HouSQgqMuDC5QpKFizQrWMlwaWPfYp1GphlueXVfPfS9FA83806_7K_qqcfHOaprqAWNOoBkzsTJNUSYsot_sog$
> >
> > +
> > +title: MediaTek Global Command Engine Common Propertes
> > +
> > +maintainers:
> > + - Houlong Wei <[email protected]>
> > +
> > +description:
> > + The Global Command Engine (GCE) is an instruction based, multi-
> > threaded,
> > + single-core command dispatcher for MediaTek hardware. The
> > Command Queue
> > + (CMDQ) mailbox driver is a driver for GCE, implemented using the
> > Linux
> > + mailbox framework. It is used to receive messages from mailbox
> > consumers
> > + and configure GCE to execute the specified instruction set in
> > the message.
> > + We use mediatek,gce-mailbox.yaml to define the properties for
> > CMDQ mailbox
> > + driver. A device driver that uses the CMDQ driver to configure
> > its hardware
> > + registers is a mailbox consumer. The mailbox consumer can
> > request a mailbox
> > + channel corresponding to a GCE hardware thread to send a
> > message, specifying
> > + that the GCE thread to configure its hardware. The mailbox
> > provider can also
> > + reserved a mailbox channel to configure GCE hardware register by
> > the spcific
> > + GCE thread. This binding defines the common GCE properties for
> > both mailbox
> > + provider and consumers.
> > +
> > +properties:
> > + mediatek,gce-events:
> > + description:
> > + GCE has an event table in SRAM, consisting of 1024 event IDs
> > (0~1023).
> > + Each event ID has a boolean event value with the default
> > value 0.
> > + The property mediatek,gce-events is used to obtain the event
> > IDs.
> > + Some gce-events are hardware-bound and cannot be changed by
> > software.
> > + For instance, in MT8195, when VDO0_MUTEX is stream done,
> > VDO_MUTEX will
> > + send an event signal to GCE, setting the value of event ID
> > 597 to 1.
> > + Similarly, in MT8188, the value of event ID 574 will be set
> > to 1 when
> > + VOD0_MUTEX is stream done.
> > + On the other hand, some gce-events are not hardware-bound
> > and can be
> > + changed by software. For example, in MT8188, we can set the
> > value of
> > + event ID 855, which is not bound to any hardware, to 1 when
> > the driver
> > + in the secure world completes a task. However, in MT8195,
> > event ID 855
> > + is already bound to VDEC_LAT1, so we need to select another
> > event ID to
> > + achieve the same purpose. This event ID can be any ID that
> > is not bound
> > + to any hardware and is not yet used in any software driver.
> > + To determine if the event ID is bound to the hardware or
> > used by a
> > + software driver, refer to the GCE header
> > + include/dt-bindings/gce/<chip>-gce.h of each chip.
> > + $ref: /schemas/types.yaml#/definitions/uint32-array
> > + minItems: 1
> > + maxItems: 1024
>
> maxItems: 1024 seems to be a bit too many... this means that one
> devicetree node
> may have up to 1024 gce events, which is impossible! If a driver
> needed all of
> the 1024 events, this means that it's not an user of the GCE, but the
> GCE itself!
>
> Imagine seeing a devicetree node with 1024 array entries for
> mediatek,gce-events...
>
Yes, that's impossible to set up to 1024 array entries.
I just have used the maximum value to cover all the possible cases.

> I'd set that to a more sensible value of 32 - eventually we can
> extend it later,
> if ever needed.
>
OK, I agree with that!
I'll change the maxItems to 32.

> Besides, nice job about all this documentation of the GCE and its
> events: love it!
>
I'm appreciate you love it :)

Regards,
Jason-JH.Lin

> Cheers,
> Angelo
>
>

2024-01-22 03:47:35

by Fei Shao

[permalink] [raw]
Subject: Re: [PATCH v3 1/3] dt-bindings: mailbox: Add mediatek,gce-props.yaml

On Fri, Jan 19, 2024 at 2:32 PM Jason-JH.Lin <jason-jh.lin@mediatekcom> wrote:
Hi Jason,

Just few nitpicks about typo:
>
> Add mediatek,gce-props.yaml for common GCE properties that is used for
> both mailbox providers and consumers. We place the common property
> "mediatek,gce-events" in this binding currently.
>
> The property "mediatek,gce-events" is used for GCE event ID corresponding
> to a hardware event signal sent by the hardware or a sofware driver.
software

> If the mailbox providers or consumers want to manipulate the value of
> the event ID, they need to know the specific event ID.
>
> Signed-off-by: Jason-JH.Lin <[email protected]>
> ---
> .../bindings/mailbox/mediatek,gce-props.yaml | 52 +++++++++++++++++++
> 1 file changed, 52 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/mailbox/mediatek,gce-props.yaml
>
> diff --git a/Documentation/devicetree/bindings/mailbox/mediatek,gce-propsyaml b/Documentation/devicetree/bindings/mailbox/mediatek,gce-props.yaml
> new file mode 100644
> index 000000000000..68b519ff089f
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mailbox/mediatek,gce-props.yaml
> @@ -0,0 +1,52 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/mailbox/mediatek,gce-props.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: MediaTek Global Command Engine Common Propertes
Properties

> +
> +maintainers:
> + - Houlong Wei <[email protected]>
> +
> +description:
> + The Global Command Engine (GCE) is an instruction based, multi-threaded,
> + single-core command dispatcher for MediaTek hardware. The Command Queue
> + (CMDQ) mailbox driver is a driver for GCE, implemented using the Linux
> + mailbox framework. It is used to receive messages from mailbox consumers
> + and configure GCE to execute the specified instruction set in the message.
> + We use mediatek,gce-mailbox.yaml to define the properties for CMDQ mailbox
> + driver. A device driver that uses the CMDQ driver to configure its hardware
> + registers is a mailbox consumer. The mailbox consumer can request a mailbox
> + channel corresponding to a GCE hardware thread to send a message, specifying
> + that the GCE thread to configure its hardware. The mailbox provider can also
> + reserved a mailbox channel to configure GCE hardware register by the spcific
s/reserved/reserve/
s/spcific/specific/

Regards,
Fei


> + GCE thread. This binding defines the common GCE properties for both mailbox
> + provider and consumers.
> +
> +properties:
> + mediatek,gce-events:
> + description:
> + GCE has an event table in SRAM, consisting of 1024 event IDs (0~1023).
> + Each event ID has a boolean event value with the default value 0.
> + The property mediatek,gce-events is used to obtain the event IDs.
> + Some gce-events are hardware-bound and cannot be changed by software.
> + For instance, in MT8195, when VDO0_MUTEX is stream done, VDO_MUTEX will
> + send an event signal to GCE, setting the value of event ID 597 to 1.
> + Similarly, in MT8188, the value of event ID 574 will be set to 1 when
> + VOD0_MUTEX is stream done.
> + On the other hand, some gce-events are not hardware-bound and can be
> + changed by software. For example, in MT8188, we can set the value of
> + event ID 855, which is not bound to any hardware, to 1 when the driver
> + in the secure world completes a task. However, in MT8195, event ID 855
> + is already bound to VDEC_LAT1, so we need to select another event ID to
> + achieve the same purpose. This event ID can be any ID that is not bound
> + to any hardware and is not yet used in any software driver.
> + To determine if the event ID is bound to the hardware or used by a
> + software driver, refer to the GCE header
> + include/dt-bindings/gce/<chip>-gce.h of each chip.
> + $ref: /schemas/types.yaml#/definitions/uint32-array
> + minItems: 1
> + maxItems: 1024
> +
> +additionalProperties: true
> --
> 2.18.0
>
>

2024-01-23 09:29:25

by Jason-JH.Lin

[permalink] [raw]
Subject: Re: [PATCH v3 1/3] dt-bindings: mailbox: Add mediatek,gce-props.yaml

Hi Fei,

Thanks for the corrections.

On Mon, 2024-01-22 at 11:44 +0800, Fei Shao wrote:
>
> External email : Please do not click links or open attachments until
> you have verified the sender or the content.
> On Fri, Jan 19, 2024 at 2:32 PM Jason-JH.Lin <
> [email protected]> wrote:
> Hi Jason,
>
> Just few nitpicks about typo:
> >
> > Add mediatek,gce-props.yaml for common GCE properties that is used
> for
> > both mailbox providers and consumers. We place the common property
> > "mediatek,gce-events" in this binding currently.
> >
> > The property "mediatek,gce-events" is used for GCE event ID
> corresponding
> > to a hardware event signal sent by the hardware or a sofware
> driver.
> software
>
> > If the mailbox providers or consumers want to manipulate the value
> of
> > the event ID, they need to know the specific event ID.
> >
> > Signed-off-by: Jason-JH.Lin <[email protected]>
> > ---
> > .../bindings/mailbox/mediatek,gce-props.yaml | 52
> +++++++++++++++++++
> > 1 file changed, 52 insertions(+)
> > create mode 100644
> Documentation/devicetree/bindings/mailbox/mediatek,gce-props.yaml
> >
> > diff --git
> a/Documentation/devicetree/bindings/mailbox/mediatek,gce-props.yaml
> b/Documentation/devicetree/bindings/mailbox/mediatek,gce-props.yaml
> > new file mode 100644
> > index 000000000000..68b519ff089f
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/mailbox/mediatek,gce-
> props.yaml
> > @@ -0,0 +1,52 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id:
> http://devicetree.org/schemas/mailbox/mediatek,gce-props.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: MediaTek Global Command Engine Common Propertes
> Properties
>
> > +
> > +maintainers:
> > + - Houlong Wei <[email protected]>
> > +
> > +description:
> > + The Global Command Engine (GCE) is an instruction based, multi-
> threaded,
> > + single-core command dispatcher for MediaTek hardware. The
> Command Queue
> > + (CMDQ) mailbox driver is a driver for GCE, implemented using the
> Linux
> > + mailbox framework. It is used to receive messages from mailbox
> consumers
> > + and configure GCE to execute the specified instruction set in
> the message.
> > + We use mediatek,gce-mailbox.yaml to define the properties for
> CMDQ mailbox
> > + driver. A device driver that uses the CMDQ driver to configure
> its hardware
> > + registers is a mailbox consumer. The mailbox consumer can
> request a mailbox
> > + channel corresponding to a GCE hardware thread to send a
> message, specifying
> > + that the GCE thread to configure its hardware. The mailbox
> provider can also
> > + reserved a mailbox channel to configure GCE hardware register by
> the spcific
> s/reserved/reserve/
> s/spcific/specific/
>
> Regards,
> Fei
>
I'll fix these typo in the next version.

Regards,
Jason-JH.Lin

2024-01-23 17:15:54

by Conor Dooley

[permalink] [raw]
Subject: Re: [PATCH v3 1/3] dt-bindings: mailbox: Add mediatek,gce-props.yaml

On Mon, Jan 22, 2024 at 11:38:15AM +0100, AngeloGioacchino Del Regno wrote:
> Il 19/01/24 17:44, Conor Dooley ha scritto:
> > Rob,
> >
> > On Fri, Jan 19, 2024 at 02:32:22PM +0800, Jason-JH.Lin wrote:
> > > Add mediatek,gce-props.yaml for common GCE properties that is used for
> > > both mailbox providers and consumers. We place the common property
> > > "mediatek,gce-events" in this binding currently.
> > >
> > > The property "mediatek,gce-events" is used for GCE event ID corresponding
> > > to a hardware event signal sent by the hardware or a sofware driver.
> > > If the mailbox providers or consumers want to manipulate the value of
> > > the event ID, they need to know the specific event ID.
> > >
> > > Signed-off-by: Jason-JH.Lin <[email protected]>
> > > ---
> > > .../bindings/mailbox/mediatek,gce-props.yaml | 52 +++++++++++++++++++
> >
> > Is bindings/mailbox the correct directory to put this in?
> >
>
> Well, the GCE is a mailbox :-)
>
> ...but I get why you're asking... and I don't think that this should go to
> arm/mediatek/ as it's really just only referring to extra properties for kind of
> "special" mailbox client events...

gce is a mailbox, but this isn't a binding for the mailbox itself, hence
me wondering. I haven't been able to think of something better though,
so
Reviewed-by: Conor Dooley <[email protected]>

Cheers,
Conor.


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