diff mbox series

[RESEND,v13,11/12] soc: mediatek: cmdq: add cmdq_dev_get_client_reg function

Message ID 20190820084932.22282-12-bibby.hsieh@mediatek.com (mailing list archive)
State New, archived
Headers show
Series support gce on mt8183 platform | expand

Commit Message

Bibby Hsieh Aug. 20, 2019, 8:49 a.m. UTC 
GCE cannot know the register base address, this function
can help cmdq client to get the cmdq_client_reg structure.

Signed-off-by: Bibby Hsieh <bibby.hsieh@mediatek.com>
Reviewed-by: CK Hu <ck.hu@mediatek.com>
---
 drivers/soc/mediatek/mtk-cmdq-helper.c | 29 ++++++++++++++++++++++++++
 include/linux/soc/mediatek/mtk-cmdq.h  | 21 +++++++++++++++++++
 2 files changed, 50 insertions(+)

Comments

houlong.wei Aug. 20, 2019, 9:40 a.m. UTC | #1 
Reviewed-by: Houlong Wei <houlong.wei@mediatek.com>
houlong.wei Aug. 20, 2019, 9:47 a.m. UTC | #2 
On Tue, 2019-08-20 at 16:49 +0800, Bibby Hsieh wrote:
> GCE cannot know the register base address, this function
> can help cmdq client to get the cmdq_client_reg structure.
> 
> Signed-off-by: Bibby Hsieh <bibby.hsieh@mediatek.com>
> Reviewed-by: CK Hu <ck.hu@mediatek.com>
> ---
>  drivers/soc/mediatek/mtk-cmdq-helper.c | 29 ++++++++++++++++++++++++++
>  include/linux/soc/mediatek/mtk-cmdq.h  | 21 +++++++++++++++++++
>  2 files changed, 50 insertions(+)
> 
> diff --git a/drivers/soc/mediatek/mtk-cmdq-helper.c b/drivers/soc/mediatek/mtk-cmdq-helper.c
> index c53f8476c68d..80f75a1075b4 100644
> --- a/drivers/soc/mediatek/mtk-cmdq-helper.c
> +++ b/drivers/soc/mediatek/mtk-cmdq-helper.c
> @@ -27,6 +27,35 @@ struct cmdq_instruction {
>  	u8 op;
>  };
>  
> +int cmdq_dev_get_client_reg(struct device *dev,
> +			    struct cmdq_client_reg *client_reg, int idx)
> +{
> +	struct of_phandle_args spec;
> +	int err;
> +
> +	if (!client_reg)
> +		return -ENOENT;
> +
> +	err = of_parse_phandle_with_fixed_args(dev->of_node,
> +					       "mediatek,gce-client-reg",
> +					       3, idx, &spec);
> +	if (err < 0) {
> +		dev_err(dev,
> +			"error %d can't parse gce-client-reg property (%d)",
> +			err, idx);
> +
> +		return err;
> +	}
> +
> +	client_reg->subsys = (u8)spec.args[0];
> +	client_reg->offset = (u16)spec.args[1];
> +	client_reg->size = (u16)spec.args[2];
> +	of_node_put(spec.np);
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL(cmdq_dev_get_client_reg);
> +
>  static void cmdq_client_timeout(struct timer_list *t)
>  {
>  	struct cmdq_client *client = from_timer(client, t, timer);
> diff --git a/include/linux/soc/mediatek/mtk-cmdq.h b/include/linux/soc/mediatek/mtk-cmdq.h
> index a345870a6d10..02ddd60b212f 100644
> --- a/include/linux/soc/mediatek/mtk-cmdq.h
> +++ b/include/linux/soc/mediatek/mtk-cmdq.h
> @@ -15,6 +15,12 @@
>  
>  struct cmdq_pkt;
>  
> +struct cmdq_client_reg {
> +	u8 subsys;
> +	u16 offset;
> +	u16 size;
> +};
> +
>  struct cmdq_client {
>  	spinlock_t lock;
>  	u32 pkt_cnt;
> @@ -24,6 +30,21 @@ struct cmdq_client {
>  	u32 timeout_ms; /* in unit of microsecond */
>  };
>  
> +/**
> + * cmdq_dev_get_client_reg() - parse cmdq client reg from the device
> + *			       node of CMDQ client
> + * @dev:	device of CMDQ mailbox client
> + * @client_reg: CMDQ client reg pointer
> + * @idx:	the index of desired reg
> + *
> + * Return: 0 for success; else the error code is returned
> + *
> + * Help CMDQ client parsing the cmdq client reg
> + * from the device node of CMDQ client.
> + */
> +int cmdq_dev_get_client_reg(struct device *dev,
> +			    struct cmdq_client_reg *client_reg, int idx);
> +
>  /**
>   * cmdq_mbox_create() - create CMDQ mailbox client and channel
>   * @dev:	device of CMDQ mailbox client

Reviewed-by: Houlong Wei <houlong.wei@mediatek.com>
Matthias Brugger Aug. 23, 2019, 2:21 p.m. UTC | #3 
On 20/08/2019 10:49, Bibby Hsieh wrote:
> GCE cannot know the register base address, this function
> can help cmdq client to get the cmdq_client_reg structure.
> 
> Signed-off-by: Bibby Hsieh <bibby.hsieh@mediatek.com>
> Reviewed-by: CK Hu <ck.hu@mediatek.com>
> ---
>  drivers/soc/mediatek/mtk-cmdq-helper.c | 29 ++++++++++++++++++++++++++
>  include/linux/soc/mediatek/mtk-cmdq.h  | 21 +++++++++++++++++++
>  2 files changed, 50 insertions(+)
> 
> diff --git a/drivers/soc/mediatek/mtk-cmdq-helper.c b/drivers/soc/mediatek/mtk-cmdq-helper.c
> index c53f8476c68d..80f75a1075b4 100644
> --- a/drivers/soc/mediatek/mtk-cmdq-helper.c
> +++ b/drivers/soc/mediatek/mtk-cmdq-helper.c
> @@ -27,6 +27,35 @@ struct cmdq_instruction {
>  	u8 op;
>  };
>  
> +int cmdq_dev_get_client_reg(struct device *dev,
> +			    struct cmdq_client_reg *client_reg, int idx)
> +{

Can't we do/call this in cmdq_mbox_create parsing the number of gce-client-reg
properties we have and allocating these using a pointer to cmdq_client_reg in
cmdq_client?
We will have to free the pointer then in cmdq_mbox_destroy.

Regards,
Matthias

> +	struct of_phandle_args spec;
> +	int err;
> +
> +	if (!client_reg)
> +		return -ENOENT;
> +
> +	err = of_parse_phandle_with_fixed_args(dev->of_node,
> +					       "mediatek,gce-client-reg",
> +					       3, idx, &spec);
> +	if (err < 0) {
> +		dev_err(dev,
> +			"error %d can't parse gce-client-reg property (%d)",
> +			err, idx);
> +
> +		return err;
> +	}
> +
> +	client_reg->subsys = (u8)spec.args[0];
> +	client_reg->offset = (u16)spec.args[1];
> +	client_reg->size = (u16)spec.args[2];
> +	of_node_put(spec.np);
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL(cmdq_dev_get_client_reg);
> +
>  static void cmdq_client_timeout(struct timer_list *t)
>  {
>  	struct cmdq_client *client = from_timer(client, t, timer);
> diff --git a/include/linux/soc/mediatek/mtk-cmdq.h b/include/linux/soc/mediatek/mtk-cmdq.h
> index a345870a6d10..02ddd60b212f 100644
> --- a/include/linux/soc/mediatek/mtk-cmdq.h
> +++ b/include/linux/soc/mediatek/mtk-cmdq.h
> @@ -15,6 +15,12 @@
>  
>  struct cmdq_pkt;
>  
> +struct cmdq_client_reg {
> +	u8 subsys;
> +	u16 offset;
> +	u16 size;
> +};
> +
>  struct cmdq_client {
>  	spinlock_t lock;
>  	u32 pkt_cnt;
> @@ -24,6 +30,21 @@ struct cmdq_client {
>  	u32 timeout_ms; /* in unit of microsecond */
>  };
>  
> +/**
> + * cmdq_dev_get_client_reg() - parse cmdq client reg from the device
> + *			       node of CMDQ client
> + * @dev:	device of CMDQ mailbox client
> + * @client_reg: CMDQ client reg pointer
> + * @idx:	the index of desired reg
> + *
> + * Return: 0 for success; else the error code is returned
> + *
> + * Help CMDQ client parsing the cmdq client reg
> + * from the device node of CMDQ client.
> + */
> +int cmdq_dev_get_client_reg(struct device *dev,
> +			    struct cmdq_client_reg *client_reg, int idx);
> +
>  /**
>   * cmdq_mbox_create() - create CMDQ mailbox client and channel
>   * @dev:	device of CMDQ mailbox client
>
Bibby Hsieh Aug. 27, 2019, 3:59 a.m. UTC | #4 
On Fri, 2019-08-23 at 16:21 +0200, Matthias Brugger wrote:
> 
> On 20/08/2019 10:49, Bibby Hsieh wrote:
> > GCE cannot know the register base address, this function
> > can help cmdq client to get the cmdq_client_reg structure.
> > 
> > Signed-off-by: Bibby Hsieh <bibby.hsieh@mediatek.com>
> > Reviewed-by: CK Hu <ck.hu@mediatek.com>
> > ---
> >  drivers/soc/mediatek/mtk-cmdq-helper.c | 29 ++++++++++++++++++++++++++
> >  include/linux/soc/mediatek/mtk-cmdq.h  | 21 +++++++++++++++++++
> >  2 files changed, 50 insertions(+)
> > 
> > diff --git a/drivers/soc/mediatek/mtk-cmdq-helper.c b/drivers/soc/mediatek/mtk-cmdq-helper.c
> > index c53f8476c68d..80f75a1075b4 100644
> > --- a/drivers/soc/mediatek/mtk-cmdq-helper.c
> > +++ b/drivers/soc/mediatek/mtk-cmdq-helper.c
> > @@ -27,6 +27,35 @@ struct cmdq_instruction {
> >  	u8 op;
> >  };
> >  
> > +int cmdq_dev_get_client_reg(struct device *dev,
> > +			    struct cmdq_client_reg *client_reg, int idx)
> > +{
> 
> Can't we do/call this in cmdq_mbox_create parsing the number of gce-client-reg
> properties we have and allocating these using a pointer to cmdq_client_reg in
> cmdq_client?
> We will have to free the pointer then in cmdq_mbox_destroy.
> 
> Regards,
> Matthias

I don't think we need to keep the cmdq_client_reg in cmdq_client
structure.
Because our client will have own data structure, they will copy the
client_reg information into their own structure.

In the design now, we do not allocate the cmdq_client_reg, client pass
the cmdq_client_reg pointer into this API.
Client will destroy the pointer after they get the information they
want.

Thanks for the comments so much.

Bibby

> 
> > +	struct of_phandle_args spec;
> > +	int err;
> > +
> > +	if (!client_reg)
> > +		return -ENOENT;
> > +
> > +	err = of_parse_phandle_with_fixed_args(dev->of_node,
> > +					       "mediatek,gce-client-reg",
> > +					       3, idx, &spec);
> > +	if (err < 0) {
> > +		dev_err(dev,
> > +			"error %d can't parse gce-client-reg property (%d)",
> > +			err, idx);
> > +
> > +		return err;
> > +	}
> > +
> > +	client_reg->subsys = (u8)spec.args[0];
> > +	client_reg->offset = (u16)spec.args[1];
> > +	client_reg->size = (u16)spec.args[2];
> > +	of_node_put(spec.np);
> > +
> > +	return 0;
> > +}
> > +EXPORT_SYMBOL(cmdq_dev_get_client_reg);
> > +
> >  static void cmdq_client_timeout(struct timer_list *t)
> >  {
> >  	struct cmdq_client *client = from_timer(client, t, timer);
> > diff --git a/include/linux/soc/mediatek/mtk-cmdq.h b/include/linux/soc/mediatek/mtk-cmdq.h
> > index a345870a6d10..02ddd60b212f 100644
> > --- a/include/linux/soc/mediatek/mtk-cmdq.h
> > +++ b/include/linux/soc/mediatek/mtk-cmdq.h
> > @@ -15,6 +15,12 @@
> >  
> >  struct cmdq_pkt;
> >  
> > +struct cmdq_client_reg {
> > +	u8 subsys;
> > +	u16 offset;
> > +	u16 size;
> > +};
> > +
> >  struct cmdq_client {
> >  	spinlock_t lock;
> >  	u32 pkt_cnt;
> > @@ -24,6 +30,21 @@ struct cmdq_client {
> >  	u32 timeout_ms; /* in unit of microsecond */
> >  };
> >  
> > +/**
> > + * cmdq_dev_get_client_reg() - parse cmdq client reg from the device
> > + *			       node of CMDQ client
> > + * @dev:	device of CMDQ mailbox client
> > + * @client_reg: CMDQ client reg pointer
> > + * @idx:	the index of desired reg
> > + *
> > + * Return: 0 for success; else the error code is returned
> > + *
> > + * Help CMDQ client parsing the cmdq client reg
> > + * from the device node of CMDQ client.
> > + */
> > +int cmdq_dev_get_client_reg(struct device *dev,
> > +			    struct cmdq_client_reg *client_reg, int idx);
> > +
> >  /**
> >   * cmdq_mbox_create() - create CMDQ mailbox client and channel
> >   * @dev:	device of CMDQ mailbox client
> >
Matthias Brugger Aug. 27, 2019, 10:13 a.m. UTC | #5 
On 27/08/2019 05:59, Bibby Hsieh wrote:
> On Fri, 2019-08-23 at 16:21 +0200, Matthias Brugger wrote:
>>
>> On 20/08/2019 10:49, Bibby Hsieh wrote:
>>> GCE cannot know the register base address, this function
>>> can help cmdq client to get the cmdq_client_reg structure.
>>>
>>> Signed-off-by: Bibby Hsieh <bibby.hsieh@mediatek.com>
>>> Reviewed-by: CK Hu <ck.hu@mediatek.com>
>>> ---
>>>  drivers/soc/mediatek/mtk-cmdq-helper.c | 29 ++++++++++++++++++++++++++
>>>  include/linux/soc/mediatek/mtk-cmdq.h  | 21 +++++++++++++++++++
>>>  2 files changed, 50 insertions(+)
>>>
>>> diff --git a/drivers/soc/mediatek/mtk-cmdq-helper.c b/drivers/soc/mediatek/mtk-cmdq-helper.c
>>> index c53f8476c68d..80f75a1075b4 100644
>>> --- a/drivers/soc/mediatek/mtk-cmdq-helper.c
>>> +++ b/drivers/soc/mediatek/mtk-cmdq-helper.c
>>> @@ -27,6 +27,35 @@ struct cmdq_instruction {
>>>  	u8 op;
>>>  };
>>>  
>>> +int cmdq_dev_get_client_reg(struct device *dev,
>>> +			    struct cmdq_client_reg *client_reg, int idx)
>>> +{
>>
>> Can't we do/call this in cmdq_mbox_create parsing the number of gce-client-reg
>> properties we have and allocating these using a pointer to cmdq_client_reg in
>> cmdq_client?
>> We will have to free the pointer then in cmdq_mbox_destroy.
>>
>> Regards,
>> Matthias
> 
> I don't think we need to keep the cmdq_client_reg in cmdq_client
> structure.
> Because our client will have own data structure, they will copy the
> client_reg information into their own structure.
> 
> In the design now, we do not allocate the cmdq_client_reg, client pass
> the cmdq_client_reg pointer into this API.
> Client will destroy the pointer after they get the information they
> want.
> 

My point wasn't so much about the lifecycle of the object, but the fact that we
add another call, which can be already full-filled by a necessary previous call
to cmdq_mbox_create. So I would prefer to add the information gathering for
cmdq_client_reg in this call, and let it live there for the time cmdq_client
lives. In the end we are talking about 40 bits of memory.

Regards,
Matthias

> Thanks for the comments so much.
> 
> Bibby
> 
>>
>>> +	struct of_phandle_args spec;
>>> +	int err;
>>> +
>>> +	if (!client_reg)
>>> +		return -ENOENT;
>>> +
>>> +	err = of_parse_phandle_with_fixed_args(dev->of_node,
>>> +					       "mediatek,gce-client-reg",
>>> +					       3, idx, &spec);
>>> +	if (err < 0) {
>>> +		dev_err(dev,
>>> +			"error %d can't parse gce-client-reg property (%d)",
>>> +			err, idx);
>>> +
>>> +		return err;
>>> +	}
>>> +
>>> +	client_reg->subsys = (u8)spec.args[0];
>>> +	client_reg->offset = (u16)spec.args[1];
>>> +	client_reg->size = (u16)spec.args[2];
>>> +	of_node_put(spec.np);
>>> +
>>> +	return 0;
>>> +}
>>> +EXPORT_SYMBOL(cmdq_dev_get_client_reg);
>>> +
>>>  static void cmdq_client_timeout(struct timer_list *t)
>>>  {
>>>  	struct cmdq_client *client = from_timer(client, t, timer);
>>> diff --git a/include/linux/soc/mediatek/mtk-cmdq.h b/include/linux/soc/mediatek/mtk-cmdq.h
>>> index a345870a6d10..02ddd60b212f 100644
>>> --- a/include/linux/soc/mediatek/mtk-cmdq.h
>>> +++ b/include/linux/soc/mediatek/mtk-cmdq.h
>>> @@ -15,6 +15,12 @@
>>>  
>>>  struct cmdq_pkt;
>>>  
>>> +struct cmdq_client_reg {
>>> +	u8 subsys;
>>> +	u16 offset;
>>> +	u16 size;
>>> +};
>>> +
>>>  struct cmdq_client {
>>>  	spinlock_t lock;
>>>  	u32 pkt_cnt;
>>> @@ -24,6 +30,21 @@ struct cmdq_client {
>>>  	u32 timeout_ms; /* in unit of microsecond */
>>>  };
>>>  
>>> +/**
>>> + * cmdq_dev_get_client_reg() - parse cmdq client reg from the device
>>> + *			       node of CMDQ client
>>> + * @dev:	device of CMDQ mailbox client
>>> + * @client_reg: CMDQ client reg pointer
>>> + * @idx:	the index of desired reg
>>> + *
>>> + * Return: 0 for success; else the error code is returned
>>> + *
>>> + * Help CMDQ client parsing the cmdq client reg
>>> + * from the device node of CMDQ client.
>>> + */
>>> +int cmdq_dev_get_client_reg(struct device *dev,
>>> +			    struct cmdq_client_reg *client_reg, int idx);
>>> +
>>>  /**
>>>   * cmdq_mbox_create() - create CMDQ mailbox client and channel
>>>   * @dev:	device of CMDQ mailbox client
>>>
> 
>
Bibby Hsieh Aug. 28, 2019, 8:32 a.m. UTC | #6 
On Tue, 2019-08-27 at 12:13 +0200, Matthias Brugger wrote:
> 
> On 27/08/2019 05:59, Bibby Hsieh wrote:
> > On Fri, 2019-08-23 at 16:21 +0200, Matthias Brugger wrote:
> >>
> >> On 20/08/2019 10:49, Bibby Hsieh wrote:
> >>> GCE cannot know the register base address, this function
> >>> can help cmdq client to get the cmdq_client_reg structure.
> >>>
> >>> Signed-off-by: Bibby Hsieh <bibby.hsieh@mediatek.com>
> >>> Reviewed-by: CK Hu <ck.hu@mediatek.com>
> >>> ---
> >>>  drivers/soc/mediatek/mtk-cmdq-helper.c | 29 ++++++++++++++++++++++++++
> >>>  include/linux/soc/mediatek/mtk-cmdq.h  | 21 +++++++++++++++++++
> >>>  2 files changed, 50 insertions(+)
> >>>
> >>> diff --git a/drivers/soc/mediatek/mtk-cmdq-helper.c b/drivers/soc/mediatek/mtk-cmdq-helper.c
> >>> index c53f8476c68d..80f75a1075b4 100644
> >>> --- a/drivers/soc/mediatek/mtk-cmdq-helper.c
> >>> +++ b/drivers/soc/mediatek/mtk-cmdq-helper.c
> >>> @@ -27,6 +27,35 @@ struct cmdq_instruction {
> >>>  	u8 op;
> >>>  };
> >>>  
> >>> +int cmdq_dev_get_client_reg(struct device *dev,
> >>> +			    struct cmdq_client_reg *client_reg, int idx)
> >>> +{
> >>
> >> Can't we do/call this in cmdq_mbox_create parsing the number of gce-client-reg
> >> properties we have and allocating these using a pointer to cmdq_client_reg in
> >> cmdq_client?
> >> We will have to free the pointer then in cmdq_mbox_destroy.
> >>
> >> Regards,
> >> Matthias
> > 
> > I don't think we need to keep the cmdq_client_reg in cmdq_client
> > structure.
> > Because our client will have own data structure, they will copy the
> > client_reg information into their own structure.
> > 
> > In the design now, we do not allocate the cmdq_client_reg, client pass
> > the cmdq_client_reg pointer into this API.
> > Client will destroy the pointer after they get the information they
> > want.
> > 
> 
> My point wasn't so much about the lifecycle of the object, but the fact that we
> add another call, which can be already full-filled by a necessary previous call
> to cmdq_mbox_create. So I would prefer to add the information gathering for
> cmdq_client_reg in this call, and let it live there for the time cmdq_client
> lives. In the end we are talking about 40 bits of memory.
> 

Thanks for the comments. :D

Actually, I'm working for developing the chandes for MTK DRM apply cmdq
interface.
For MTK DRM, all the components included in MTK_CRTC use one mailbox
channel. According to [1], we create mailbox channel by mmsys device
node after get all the informations (include cmdq_client_reg) about
every device node of display components respectively. Please refer to
[2], [3] and [4], I'm going to upstream them recently.

If create mailbox channel and get the cmdq_client_reg in the same device
node, your suggestion is good for me.
But from display and mdp's viewpoint now, I don't think it is convenient
for them.

So I still prefer separate this function out of cmdq_mbox_create.:D


[1]
https://elixir.bootlin.com/linux/latest/source/arch/arm64/boot/dts/mediatek/mt8173.dtsi#907
[2] get cmdq_client_reg in mtk_ddp_comp_init()
https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/1746354/12/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c#431
[3] create mailbox channel in mtk_drm_crtc_create()
https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/1746354/12/drivers/gpu/drm/mediatek/mtk_drm_crtc.c#814
[4] After component_bind_all(), the mtk_drm_crtc_create will be called 
https://chromium.googlesource.com/chromiumos/third_party/kernel/+/e15c2dc6ceb4810a2090cd11a512932095866559/drivers/gpu/drm/mediatek/mtk_drm_drv.c#452

Thanks.
Bibby

> Regards,
> Matthias
> 
> > Thanks for the comments so much.
> > 
> > Bibby
> > 
> >>
> >>> +	struct of_phandle_args spec;
> >>> +	int err;
> >>> +
> >>> +	if (!client_reg)
> >>> +		return -ENOENT;
> >>> +
> >>> +	err = of_parse_phandle_with_fixed_args(dev->of_node,
> >>> +					       "mediatek,gce-client-reg",
> >>> +					       3, idx, &spec);
> >>> +	if (err < 0) {
> >>> +		dev_err(dev,
> >>> +			"error %d can't parse gce-client-reg property (%d)",
> >>> +			err, idx);
> >>> +
> >>> +		return err;
> >>> +	}
> >>> +
> >>> +	client_reg->subsys = (u8)spec.args[0];
> >>> +	client_reg->offset = (u16)spec.args[1];
> >>> +	client_reg->size = (u16)spec.args[2];
> >>> +	of_node_put(spec.np);
> >>> +
> >>> +	return 0;
> >>> +}
> >>> +EXPORT_SYMBOL(cmdq_dev_get_client_reg);
> >>> +
> >>>  static void cmdq_client_timeout(struct timer_list *t)
> >>>  {
> >>>  	struct cmdq_client *client = from_timer(client, t, timer);
> >>> diff --git a/include/linux/soc/mediatek/mtk-cmdq.h b/include/linux/soc/mediatek/mtk-cmdq.h
> >>> index a345870a6d10..02ddd60b212f 100644
> >>> --- a/include/linux/soc/mediatek/mtk-cmdq.h
> >>> +++ b/include/linux/soc/mediatek/mtk-cmdq.h
> >>> @@ -15,6 +15,12 @@
> >>>  
> >>>  struct cmdq_pkt;
> >>>  
> >>> +struct cmdq_client_reg {
> >>> +	u8 subsys;
> >>> +	u16 offset;
> >>> +	u16 size;
> >>> +};
> >>> +
> >>>  struct cmdq_client {
> >>>  	spinlock_t lock;
> >>>  	u32 pkt_cnt;
> >>> @@ -24,6 +30,21 @@ struct cmdq_client {
> >>>  	u32 timeout_ms; /* in unit of microsecond */
> >>>  };
> >>>  
> >>> +/**
> >>> + * cmdq_dev_get_client_reg() - parse cmdq client reg from the device
> >>> + *			       node of CMDQ client
> >>> + * @dev:	device of CMDQ mailbox client
> >>> + * @client_reg: CMDQ client reg pointer
> >>> + * @idx:	the index of desired reg
> >>> + *
> >>> + * Return: 0 for success; else the error code is returned
> >>> + *
> >>> + * Help CMDQ client parsing the cmdq client reg
> >>> + * from the device node of CMDQ client.
> >>> + */
> >>> +int cmdq_dev_get_client_reg(struct device *dev,
> >>> +			    struct cmdq_client_reg *client_reg, int idx);
> >>> +
> >>>  /**
> >>>   * cmdq_mbox_create() - create CMDQ mailbox client and channel
> >>>   * @dev:	device of CMDQ mailbox client
> >>>
> > 
> >
diff mbox series

Patch

diff --git a/drivers/soc/mediatek/mtk-cmdq-helper.c b/drivers/soc/mediatek/mtk-cmdq-helper.c
index c53f8476c68d..80f75a1075b4 100644
--- a/drivers/soc/mediatek/mtk-cmdq-helper.c
+++ b/drivers/soc/mediatek/mtk-cmdq-helper.c
@@ -27,6 +27,35 @@  struct cmdq_instruction {
 	u8 op;
 };
 
+int cmdq_dev_get_client_reg(struct device *dev,
+			    struct cmdq_client_reg *client_reg, int idx)
+{
+	struct of_phandle_args spec;
+	int err;
+
+	if (!client_reg)
+		return -ENOENT;
+
+	err = of_parse_phandle_with_fixed_args(dev->of_node,
+					       "mediatek,gce-client-reg",
+					       3, idx, &spec);
+	if (err < 0) {
+		dev_err(dev,
+			"error %d can't parse gce-client-reg property (%d)",
+			err, idx);
+
+		return err;
+	}
+
+	client_reg->subsys = (u8)spec.args[0];
+	client_reg->offset = (u16)spec.args[1];
+	client_reg->size = (u16)spec.args[2];
+	of_node_put(spec.np);
+
+	return 0;
+}
+EXPORT_SYMBOL(cmdq_dev_get_client_reg);
+
 static void cmdq_client_timeout(struct timer_list *t)
 {
 	struct cmdq_client *client = from_timer(client, t, timer);
diff --git a/include/linux/soc/mediatek/mtk-cmdq.h b/include/linux/soc/mediatek/mtk-cmdq.h
index a345870a6d10..02ddd60b212f 100644
--- a/include/linux/soc/mediatek/mtk-cmdq.h
+++ b/include/linux/soc/mediatek/mtk-cmdq.h
@@ -15,6 +15,12 @@ 
 
 struct cmdq_pkt;
 
+struct cmdq_client_reg {
+	u8 subsys;
+	u16 offset;
+	u16 size;
+};
+
 struct cmdq_client {
 	spinlock_t lock;
 	u32 pkt_cnt;
@@ -24,6 +30,21 @@  struct cmdq_client {
 	u32 timeout_ms; /* in unit of microsecond */
 };
 
+/**
+ * cmdq_dev_get_client_reg() - parse cmdq client reg from the device
+ *			       node of CMDQ client
+ * @dev:	device of CMDQ mailbox client
+ * @client_reg: CMDQ client reg pointer
+ * @idx:	the index of desired reg
+ *
+ * Return: 0 for success; else the error code is returned
+ *
+ * Help CMDQ client parsing the cmdq client reg
+ * from the device node of CMDQ client.
+ */
+int cmdq_dev_get_client_reg(struct device *dev,
+			    struct cmdq_client_reg *client_reg, int idx);
+
 /**
  * cmdq_mbox_create() - create CMDQ mailbox client and channel
  * @dev:	device of CMDQ mailbox client