[PATCH RESEND] ethernet: stmmac: fix for none child queue node for tx node

[PATCH RESEND] ethernet: stmmac: fix for none child queue node for tx node

[Jianqun Xu]

In case of nothing to be set for tx node result in no child queue node
for the tx node, this patch init the queue to tx_queues_to_use instead
of 0 to support dt file set no queue node for tx node.

Signed-off-by: Jianqun Xu <jay.xu@rock-chips.com>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
index 2d8c095f3856..4f01a41c485c 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
@@ -279,7 +279,7 @@ static int stmmac_mtl_setup(struct platform_device *pdev,
 
 		queue++;
 	}
-	if (queue != plat->tx_queues_to_use) {
+	if (queue != plat->tx_queues_to_use && of_get_child_count(tx_node)) {
 		ret = -EINVAL;
 		dev_err(&pdev->dev, "Not all TX queues were configured\n");
 		goto out;
-- 
2.25.1

[PATCH RESEND] ethernet: stmmac: fix for none child queue node for tx node

[Jianqun Xu]

In case of nothing to be set for tx node result in no child queue node
for the tx node, this patch init the queue to tx_queues_to_use instead
of 0 to support dt file set no queue node for tx node.

Signed-off-by: Jianqun Xu <jay.xu@rock-chips.com>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
index 2d8c095f3856..4f01a41c485c 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
@@ -279,7 +279,7 @@ static int stmmac_mtl_setup(struct platform_device *pdev,
 
 		queue++;
 	}
-	if (queue != plat->tx_queues_to_use) {
+	if (queue != plat->tx_queues_to_use && of_get_child_count(tx_node)) {
 		ret = -EINVAL;
 		dev_err(&pdev->dev, "Not all TX queues were configured\n");
 		goto out;
-- 
2.25.1


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Re: [PATCH RESEND] ethernet: stmmac: fix for none child queue node for tx node

[Jakub Kicinski]

On Thu, 28 Apr 2022 09:09:27 +0800 Jianqun Xu wrote:
> In case of nothing to be set for tx node result in no child queue node
> for the tx node, this patch init the queue to tx_queues_to_use instead
> of 0 to support dt file set no queue node for tx node.
> 
> Signed-off-by: Jianqun Xu <jay.xu@rock-chips.com>

Something needs to initialize the settings
(plat->tx_queues_cfg[queue].#) to the defaults, no? 
Just ignoring the error may not be enough.

Also has this ever worked? If you're trying to make the driver work for
DTs that never worked (and are arguably invalid) -- please change the
subject from "fix..." to "support...".

> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> index 2d8c095f3856..4f01a41c485c 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> @@ -279,7 +279,7 @@ static int stmmac_mtl_setup(struct platform_device *pdev,
>  
>  		queue++;
>  	}
> -	if (queue != plat->tx_queues_to_use) {
> +	if (queue != plat->tx_queues_to_use && of_get_child_count(tx_node)) {
>  		ret = -EINVAL;
>  		dev_err(&pdev->dev, "Not all TX queues were configured\n");
>  		goto out;

Re: [PATCH RESEND] ethernet: stmmac: fix for none child queue node for tx node

[Jakub Kicinski]

On Thu, 28 Apr 2022 09:09:27 +0800 Jianqun Xu wrote:
> In case of nothing to be set for tx node result in no child queue node
> for the tx node, this patch init the queue to tx_queues_to_use instead
> of 0 to support dt file set no queue node for tx node.
> 
> Signed-off-by: Jianqun Xu <jay.xu@rock-chips.com>

Something needs to initialize the settings
(plat->tx_queues_cfg[queue].#) to the defaults, no? 
Just ignoring the error may not be enough.

Also has this ever worked? If you're trying to make the driver work for
DTs that never worked (and are arguably invalid) -- please change the
subject from "fix..." to "support...".

> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> index 2d8c095f3856..4f01a41c485c 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> @@ -279,7 +279,7 @@ static int stmmac_mtl_setup(struct platform_device *pdev,
>  
>  		queue++;
>  	}
> -	if (queue != plat->tx_queues_to_use) {
> +	if (queue != plat->tx_queues_to_use && of_get_child_count(tx_node)) {
>  		ret = -EINVAL;
>  		dev_err(&pdev->dev, "Not all TX queues were configured\n");
>  		goto out;


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[PATCH V2] ethernet: stmmac: support driver work for DTs without child queue node

[Jianqun Xu]

The driver use the value of property 'snps,rx-queues-to-use' to loop
same numbers child nodes as queues, such as:

    gmac {
        rx-queues-config {
            snps,rx-queues-to-use = <1>;
            queue0 {
                // nothing need here.
	    };
	};
    };

Since a patch for dtc from rockchip will delete all node without any
properties or child node, the queue0 node will be deleted, that caused
the driver fail to probe:

    rk_gmac-dwmac: probe of ffa80000.ethernet failed with error -22

This patch try to support driver work well for DTs without setting for
the child queue nodes and then have none child queue nodes.

Signed-off-by: Jianqun Xu <jay.xu@rock-chips.com>
---
v2:
 - change subject and update commit comment, sugguested by Kicinski

 drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
index 2d8c095f3856..4f01a41c485c 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
@@ -279,7 +279,7 @@ static int stmmac_mtl_setup(struct platform_device *pdev,
 
 		queue++;
 	}
-	if (queue != plat->tx_queues_to_use) {
+	if (queue != plat->tx_queues_to_use && of_get_child_count(tx_node)) {
 		ret = -EINVAL;
 		dev_err(&pdev->dev, "Not all TX queues were configured\n");
 		goto out;
-- 
2.25.1

[PATCH V2] ethernet: stmmac: support driver work for DTs without child queue node

[Jianqun Xu]

The driver use the value of property 'snps,rx-queues-to-use' to loop
same numbers child nodes as queues, such as:

    gmac {
        rx-queues-config {
            snps,rx-queues-to-use = <1>;
            queue0 {
                // nothing need here.
	    };
	};
    };

Since a patch for dtc from rockchip will delete all node without any
properties or child node, the queue0 node will be deleted, that caused
the driver fail to probe:

    rk_gmac-dwmac: probe of ffa80000.ethernet failed with error -22

This patch try to support driver work well for DTs without setting for
the child queue nodes and then have none child queue nodes.

Signed-off-by: Jianqun Xu <jay.xu@rock-chips.com>
---
v2:
 - change subject and update commit comment, sugguested by Kicinski

 drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
index 2d8c095f3856..4f01a41c485c 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
@@ -279,7 +279,7 @@ static int stmmac_mtl_setup(struct platform_device *pdev,
 
 		queue++;
 	}
-	if (queue != plat->tx_queues_to_use) {
+	if (queue != plat->tx_queues_to_use && of_get_child_count(tx_node)) {
 		ret = -EINVAL;
 		dev_err(&pdev->dev, "Not all TX queues were configured\n");
 		goto out;
-- 
2.25.1


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[PATCH V2] ethernet: stmmac: support driver work for DTs without child queue node

[Jianqun Xu]

The driver use the value of property 'snps,rx-queues-to-use' to loop
same numbers child nodes as queues, such as:

    gmac {
        rx-queues-config {
            snps,rx-queues-to-use = <1>;
            queue0 {
                // nothing need here.
	    };
	};
    };

Since a patch for dtc from rockchip will delete all node without any
properties or child node, the queue0 node will be deleted, that caused
the driver fail to probe:

    rk_gmac-dwmac: probe of ffa80000.ethernet failed with error -22

This patch try to support driver work well for DTs without setting for
the child queue nodes and then have none child queue nodes.

Signed-off-by: Jianqun Xu <jay.xu@rock-chips.com>
---
v2:
 - change subject and update commit comment, sugguested by Kicinski

 drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
index 2d8c095f3856..4f01a41c485c 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
@@ -279,7 +279,7 @@ static int stmmac_mtl_setup(struct platform_device *pdev,
 
 		queue++;
 	}
-	if (queue != plat->tx_queues_to_use) {
+	if (queue != plat->tx_queues_to_use && of_get_child_count(tx_node)) {
 		ret = -EINVAL;
 		dev_err(&pdev->dev, "Not all TX queues were configured\n");
 		goto out;
-- 
2.25.1


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Re: [PATCH V2] ethernet: stmmac: support driver work for DTs without child queue node

[Andrew Lunn]

On Fri, Apr 29, 2022 at 08:46:05AM +0800, Jianqun Xu wrote:
> The driver use the value of property 'snps,rx-queues-to-use' to loop
> same numbers child nodes as queues, such as:
> 
>     gmac {
>         rx-queues-config {
>             snps,rx-queues-to-use = <1>;
>             queue0 {
>                 // nothing need here.
> 	    };
> 	};
>     };
> 
> Since a patch for dtc from rockchip will delete all node without any
> properties or child node, the queue0 node will be deleted, that caused
> the driver fail to probe:

Is this the in tree dtc? Do you have a commit hash for it? That should
probably be used as a Fixes: tag. Or that change to dtc needs
reverting because it breaks stuff.

	  Andrew

Re: [PATCH V2] ethernet: stmmac: support driver work for DTs without child queue node

[Andrew Lunn]

On Fri, Apr 29, 2022 at 08:46:05AM +0800, Jianqun Xu wrote:
> The driver use the value of property 'snps,rx-queues-to-use' to loop
> same numbers child nodes as queues, such as:
> 
>     gmac {
>         rx-queues-config {
>             snps,rx-queues-to-use = <1>;
>             queue0 {
>                 // nothing need here.
> 	    };
> 	};
>     };
> 
> Since a patch for dtc from rockchip will delete all node without any
> properties or child node, the queue0 node will be deleted, that caused
> the driver fail to probe:

Is this the in tree dtc? Do you have a commit hash for it? That should
probably be used as a Fixes: tag. Or that change to dtc needs
reverting because it breaks stuff.

	  Andrew

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Re: [PATCH V2] ethernet: stmmac: support driver work for DTs without child queue node

[Andrew Lunn]

On Fri, Apr 29, 2022 at 08:46:05AM +0800, Jianqun Xu wrote:
> The driver use the value of property 'snps,rx-queues-to-use' to loop
> same numbers child nodes as queues, such as:
> 
>     gmac {
>         rx-queues-config {
>             snps,rx-queues-to-use = <1>;
>             queue0 {
>                 // nothing need here.
> 	    };
> 	};
>     };
> 
> Since a patch for dtc from rockchip will delete all node without any
> properties or child node, the queue0 node will be deleted, that caused
> the driver fail to probe:

Is this the in tree dtc? Do you have a commit hash for it? That should
probably be used as a Fixes: tag. Or that change to dtc needs
reverting because it breaks stuff.

	  Andrew

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Re: [PATCH V2] ethernet: stmmac: support driver work for DTs without child queue node

[Jakub Kicinski]

On Fri, 29 Apr 2022 08:46:05 +0800 Jianqun Xu wrote:
> The driver use the value of property 'snps,rx-queues-to-use' to loop
> same numbers child nodes as queues, such as:
> 
>     gmac {
>         rx-queues-config {
>             snps,rx-queues-to-use = <1>;
>             queue0 {
>                 // nothing need here.
> 	    };
> 	};
>     };

I think you mean tx, not rx, given the code.

>  
>  		queue++;
>  	}
> -	if (queue != plat->tx_queues_to_use) {
> +	if (queue != plat->tx_queues_to_use && of_get_child_count(tx_node)) {
>  		ret = -EINVAL;
>  		dev_err(&pdev->dev, "Not all TX queues were configured\n");
>  		goto out;

Also what about the init to defaults I asked about?

Re: [PATCH V2] ethernet: stmmac: support driver work for DTs without child queue node

[Jakub Kicinski]

On Fri, 29 Apr 2022 08:46:05 +0800 Jianqun Xu wrote:
> The driver use the value of property 'snps,rx-queues-to-use' to loop
> same numbers child nodes as queues, such as:
> 
>     gmac {
>         rx-queues-config {
>             snps,rx-queues-to-use = <1>;
>             queue0 {
>                 // nothing need here.
> 	    };
> 	};
>     };

I think you mean tx, not rx, given the code.

>  
>  		queue++;
>  	}
> -	if (queue != plat->tx_queues_to_use) {
> +	if (queue != plat->tx_queues_to_use && of_get_child_count(tx_node)) {
>  		ret = -EINVAL;
>  		dev_err(&pdev->dev, "Not all TX queues were configured\n");
>  		goto out;

Also what about the init to defaults I asked about?

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Re: [PATCH V2] ethernet: stmmac: support driver work for DTs without child queue node

[Jakub Kicinski]

On Fri, 29 Apr 2022 08:46:05 +0800 Jianqun Xu wrote:
> The driver use the value of property 'snps,rx-queues-to-use' to loop
> same numbers child nodes as queues, such as:
> 
>     gmac {
>         rx-queues-config {
>             snps,rx-queues-to-use = <1>;
>             queue0 {
>                 // nothing need here.
> 	    };
> 	};
>     };

I think you mean tx, not rx, given the code.

>  
>  		queue++;
>  	}
> -	if (queue != plat->tx_queues_to_use) {
> +	if (queue != plat->tx_queues_to_use && of_get_child_count(tx_node)) {
>  		ret = -EINVAL;
>  		dev_err(&pdev->dev, "Not all TX queues were configured\n");
>  		goto out;

Also what about the init to defaults I asked about?

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Re: Re: [PATCH V2] ethernet: stmmac: support driver work for DTs without child queue node

[jay.xu]

Hi, andrew

--------------
jay.xu@rock-chips.com
>On Fri, Apr 29, 2022 at 08:46:05AM +0800, Jianqun Xu wrote:
>> The driver use the value of property 'snps,rx-queues-to-use' to loop
>> same numbers child nodes as queues, such as:
>>
>>     gmac {
>>         rx-queues-config {
>>             snps,rx-queues-to-use = <1>;
>>             queue0 {
>>                 // nothing need here.
>>     };
>> };
>>     };
>>
>> Since a patch for dtc from rockchip will delete all node without any
>> properties or child node, the queue0 node will be deleted, that caused
>> the driver fail to probe:
>
>Is this the in tree dtc? Do you have a commit hash for it? That should
>probably be used as a Fixes: tag. Or that change to dtc needs
>reverting because it breaks stuff.
> 
The patch is a hack patch for some products and have not in tree dtc, I said that to
explain a possible case how things happed, it's only a case of no child queue node.

In my mind, it's hard to understand the one property (snps,rx-queues-to-use) does
have a limit for another nodes or properties, if it must work well, the dtc is better to
do a abort, like #size-cells ?

My personally question from a insigth of DTs but gmac, if it's not a good question,
I can simply add a status = "okay" for the empty node and drop this patch.

>	  Andrew
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Re: Re: [PATCH V2] ethernet: stmmac: support driver work for DTs without child queue node

[jay.xu]

Hi, andrew

--------------
jay.xu@rock-chips.com
>On Fri, Apr 29, 2022 at 08:46:05AM +0800, Jianqun Xu wrote:
>> The driver use the value of property 'snps,rx-queues-to-use' to loop
>> same numbers child nodes as queues, such as:
>>
>>     gmac {
>>         rx-queues-config {
>>             snps,rx-queues-to-use = <1>;
>>             queue0 {
>>                 // nothing need here.
>>     };
>> };
>>     };
>>
>> Since a patch for dtc from rockchip will delete all node without any
>> properties or child node, the queue0 node will be deleted, that caused
>> the driver fail to probe:
>
>Is this the in tree dtc? Do you have a commit hash for it? That should
>probably be used as a Fixes: tag. Or that change to dtc needs
>reverting because it breaks stuff.
> 
The patch is a hack patch for some products and have not in tree dtc, I said that to
explain a possible case how things happed, it's only a case of no child queue node.

In my mind, it's hard to understand the one property (snps,rx-queues-to-use) does
have a limit for another nodes or properties, if it must work well, the dtc is better to
do a abort, like #size-cells ?

My personally question from a insigth of DTs but gmac, if it's not a good question,
I can simply add a status = "okay" for the empty node and drop this patch.

>	  Andrew
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Re: Re: [PATCH V2] ethernet: stmmac: support driver work for DTs without child queue node

[Andrew Lunn]

Adding device tree list.

This is mostly a device tree issue, so the device tree Maintainers
should be part of the discussion.

> >On Fri, Apr 29, 2022 at 08:46:05AM +0800, Jianqun Xu wrote:
> >> The driver use the value of property 'snps,rx-queues-to-use' to loop
> >> same numbers child nodes as queues, such as:
> >>
> >>     gmac {
> >>         rx-queues-config {
> >>             snps,rx-queues-to-use = <1>;
> >>             queue0 {
> >>                 // nothing need here.
> >>     };
> >> };
> >>     };
> >>
> >> Since a patch for dtc from rockchip will delete all node without any
> >> properties or child node, the queue0 node will be deleted, that caused
> >> the driver fail to probe:
> >
> >Is this the in tree dtc? Do you have a commit hash for it? That should
> >probably be used as a Fixes: tag. Or that change to dtc needs
> >reverting because it breaks stuff.
> > 
> The patch is a hack patch for some products and have not in tree dtc, I said that to
> explain a possible case how things happed, it's only a case of no child queue node.

So this has nothing to do with the kernel dtc, or the upstream
dtc. This is only a 'vendor crap' dtc which has been hacked?

Why should mainline care? Is there anything in the DT standard which
says the compiler can optimise out empty properties?

     Andrew

Re: Re: [PATCH V2] ethernet: stmmac: support driver work for DTs without child queue node

[Andrew Lunn]

Adding device tree list.

This is mostly a device tree issue, so the device tree Maintainers
should be part of the discussion.

> >On Fri, Apr 29, 2022 at 08:46:05AM +0800, Jianqun Xu wrote:
> >> The driver use the value of property 'snps,rx-queues-to-use' to loop
> >> same numbers child nodes as queues, such as:
> >>
> >>     gmac {
> >>         rx-queues-config {
> >>             snps,rx-queues-to-use = <1>;
> >>             queue0 {
> >>                 // nothing need here.
> >>     };
> >> };
> >>     };
> >>
> >> Since a patch for dtc from rockchip will delete all node without any
> >> properties or child node, the queue0 node will be deleted, that caused
> >> the driver fail to probe:
> >
> >Is this the in tree dtc? Do you have a commit hash for it? That should
> >probably be used as a Fixes: tag. Or that change to dtc needs
> >reverting because it breaks stuff.
> > 
> The patch is a hack patch for some products and have not in tree dtc, I said that to
> explain a possible case how things happed, it's only a case of no child queue node.

So this has nothing to do with the kernel dtc, or the upstream
dtc. This is only a 'vendor crap' dtc which has been hacked?

Why should mainline care? Is there anything in the DT standard which
says the compiler can optimise out empty properties?

     Andrew

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Re: Re: [PATCH V2] ethernet: stmmac: support driver work for DTs without child queue node

[Andrew Lunn]

Adding device tree list.

This is mostly a device tree issue, so the device tree Maintainers
should be part of the discussion.

> >On Fri, Apr 29, 2022 at 08:46:05AM +0800, Jianqun Xu wrote:
> >> The driver use the value of property 'snps,rx-queues-to-use' to loop
> >> same numbers child nodes as queues, such as:
> >>
> >>     gmac {
> >>         rx-queues-config {
> >>             snps,rx-queues-to-use = <1>;
> >>             queue0 {
> >>                 // nothing need here.
> >>     };
> >> };
> >>     };
> >>
> >> Since a patch for dtc from rockchip will delete all node without any
> >> properties or child node, the queue0 node will be deleted, that caused
> >> the driver fail to probe:
> >
> >Is this the in tree dtc? Do you have a commit hash for it? That should
> >probably be used as a Fixes: tag. Or that change to dtc needs
> >reverting because it breaks stuff.
> > 
> The patch is a hack patch for some products and have not in tree dtc, I said that to
> explain a possible case how things happed, it's only a case of no child queue node.

So this has nothing to do with the kernel dtc, or the upstream
dtc. This is only a 'vendor crap' dtc which has been hacked?

Why should mainline care? Is there anything in the DT standard which
says the compiler can optimise out empty properties?

     Andrew

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Re: Re: [PATCH V2] ethernet: stmmac: support driver work for DTs without child queue node

[jay.xu]

Hi Andrew

--------------
jay.xu@rock-chips.com
>Adding device tree list.
>
>This is mostly a device tree issue, so the device tree Maintainers
>should be part of the discussion.
>
>> >On Fri, Apr 29, 2022 at 08:46:05AM +0800, Jianqun Xu wrote:
>> >> The driver use the value of property 'snps,rx-queues-to-use' to loop
>> >> same numbers child nodes as queues, such as:
>> >>
>> >>     gmac {
>> >>         rx-queues-config {
>> >>             snps,rx-queues-to-use = <1>;
>> >>             queue0 {
>> >>                 // nothing need here.
>> >>     };
>> >> };
>> >>     };
>> >>
>> >> Since a patch for dtc from rockchip will delete all node without any
>> >> properties or child node, the queue0 node will be deleted, that caused
>> >> the driver fail to probe:
>> >
>> >Is this the in tree dtc? Do you have a commit hash for it? That should
>> >probably be used as a Fixes: tag. Or that change to dtc needs
>> >reverting because it breaks stuff.
>> >
>> The patch is a hack patch for some products and have not in tree dtc, I said that to
>> explain a possible case how things happed, it's only a case of no child queue node.
>
>So this has nothing to do with the kernel dtc, or the upstream
>dtc. This is only a 'vendor crap' dtc which has been hacked?
>
>Why should mainline care? Is there anything in the DT standard which
>says the compiler can optimise out empty properties? 

Yes, it't nothing about what kind of dtc, does about what rule for properties, now the one property
request another child node must exist and number of child node must equal to the value of the property,
the 
#address-cells = <1>;
#size-cells = <1>;
does this but they are in special key words, the gmac has no likely key word.

>
>     Andrew
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Re: Re: [PATCH V2] ethernet: stmmac: support driver work for DTs without child queue node

[jay.xu]

Hi Andrew

--------------
jay.xu@rock-chips.com
>Adding device tree list.
>
>This is mostly a device tree issue, so the device tree Maintainers
>should be part of the discussion.
>
>> >On Fri, Apr 29, 2022 at 08:46:05AM +0800, Jianqun Xu wrote:
>> >> The driver use the value of property 'snps,rx-queues-to-use' to loop
>> >> same numbers child nodes as queues, such as:
>> >>
>> >>     gmac {
>> >>         rx-queues-config {
>> >>             snps,rx-queues-to-use = <1>;
>> >>             queue0 {
>> >>                 // nothing need here.
>> >>     };
>> >> };
>> >>     };
>> >>
>> >> Since a patch for dtc from rockchip will delete all node without any
>> >> properties or child node, the queue0 node will be deleted, that caused
>> >> the driver fail to probe:
>> >
>> >Is this the in tree dtc? Do you have a commit hash for it? That should
>> >probably be used as a Fixes: tag. Or that change to dtc needs
>> >reverting because it breaks stuff.
>> >
>> The patch is a hack patch for some products and have not in tree dtc, I said that to
>> explain a possible case how things happed, it's only a case of no child queue node.
>
>So this has nothing to do with the kernel dtc, or the upstream
>dtc. This is only a 'vendor crap' dtc which has been hacked?
>
>Why should mainline care? Is there anything in the DT standard which
>says the compiler can optimise out empty properties? 

Yes, it't nothing about what kind of dtc, does about what rule for properties, now the one property
request another child node must exist and number of child node must equal to the value of the property,
the 
#address-cells = <1>;
#size-cells = <1>;
does this but they are in special key words, the gmac has no likely key word.

>
>     Andrew
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linux-arm-kernel@lists.infradead.org
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