[PATCH] ARM: dts: bcm283x: Add cells encoding format to firmware bus

[PATCH] ARM: dts: bcm283x: Add cells encoding format to firmware bus

[Nicolas Saenz Julienne]

With the introduction of 55c7c0621078 ("ARM: dts: bcm283x: Fix vc4's
firmware bus DMA limitations") the firmware bus has to comply with
/soc's DMA limitations. Ultimately linking both buses to a same
dma-ranges property. The patch (and author) missed the fact that a bus'
#address-cells and #size-cells properties are not inherited, but set to
a fixed value which, in this case, doesn't match /soc's. This, although
not breaking Linux's DMA mapping functionality, generates ugly dtc
warnings.

Fix the issue by adding the correct address and size cells properties
under the firmware bus.

Fixes: 55c7c0621078 ("ARM: dts: bcm283x: Fix vc4's firmware bus DMA limitations")
Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
---
 arch/arm/boot/dts/bcm2835-rpi.dtsi | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/arm/boot/dts/bcm2835-rpi.dtsi b/arch/arm/boot/dts/bcm2835-rpi.dtsi
index fd2c766e0f71..f7ae5a4530b8 100644
--- a/arch/arm/boot/dts/bcm2835-rpi.dtsi
+++ b/arch/arm/boot/dts/bcm2835-rpi.dtsi
@@ -14,6 +14,9 @@ act {
 	soc {
 		firmware: firmware {
 			compatible = "raspberrypi,bcm2835-firmware", "simple-bus";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
 			mboxes = <&mailbox>;
 			dma-ranges;
 		};
-- 
2.25.1

Re: [PATCH] ARM: dts: bcm283x: Add cells encoding format to firmware bus

[Matthias Brugger]

On 26/03/2020 14:44, Nicolas Saenz Julienne wrote:
> With the introduction of 55c7c0621078 ("ARM: dts: bcm283x: Fix vc4's
> firmware bus DMA limitations") the firmware bus has to comply with
> /soc's DMA limitations. Ultimately linking both buses to a same
> dma-ranges property. The patch (and author) missed the fact that a bus'
> #address-cells and #size-cells properties are not inherited, but set to
> a fixed value which, in this case, doesn't match /soc's. This, although
> not breaking Linux's DMA mapping functionality, generates ugly dtc
> warnings.
> 
> Fix the issue by adding the correct address and size cells properties
> under the firmware bus.
> 
> Fixes: 55c7c0621078 ("ARM: dts: bcm283x: Fix vc4's firmware bus DMA limitations")
> Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>

Reviewed-by: Matthias Brugger <mbrugger@suse.com>

> ---
>  arch/arm/boot/dts/bcm2835-rpi.dtsi | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/bcm2835-rpi.dtsi b/arch/arm/boot/dts/bcm2835-rpi.dtsi
> index fd2c766e0f71..f7ae5a4530b8 100644
> --- a/arch/arm/boot/dts/bcm2835-rpi.dtsi
> +++ b/arch/arm/boot/dts/bcm2835-rpi.dtsi
> @@ -14,6 +14,9 @@ act {
>  	soc {
>  		firmware: firmware {
>  			compatible = "raspberrypi,bcm2835-firmware", "simple-bus";
> +			#address-cells = <1>;
> +			#size-cells = <1>;
> +
>  			mboxes = <&mailbox>;
>  			dma-ranges;
>  		};
> 

Re: [PATCH] ARM: dts: bcm283x: Add cells encoding format to firmware bus

[Florian Fainelli]

On 3/27/2020 9:15 AM, Matthias Brugger wrote:
> 
> 
> On 26/03/2020 14:44, Nicolas Saenz Julienne wrote:
>> With the introduction of 55c7c0621078 ("ARM: dts: bcm283x: Fix vc4's
>> firmware bus DMA limitations") the firmware bus has to comply with
>> /soc's DMA limitations. Ultimately linking both buses to a same
>> dma-ranges property. The patch (and author) missed the fact that a bus'
>> #address-cells and #size-cells properties are not inherited, but set to
>> a fixed value which, in this case, doesn't match /soc's. This, although
>> not breaking Linux's DMA mapping functionality, generates ugly dtc
>> warnings.
>>
>> Fix the issue by adding the correct address and size cells properties
>> under the firmware bus.
>>
>> Fixes: 55c7c0621078 ("ARM: dts: bcm283x: Fix vc4's firmware bus DMA limitations")
>> Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
> 
> Reviewed-by: Matthias Brugger <mbrugger@suse.com>

Should this be squashed into "ARM: dts: bcm283x: Fix vc4's firmware bus
DMA limitations"? I have not gotten a response it has been accepted yet.
-- 
Florian

Re: [PATCH] ARM: dts: bcm283x: Add cells encoding format to firmware bus

[Matthias Brugger]

On 27/03/2020 17:17, Florian Fainelli wrote:
> 
> 
> On 3/27/2020 9:15 AM, Matthias Brugger wrote:
>>
>>
>> On 26/03/2020 14:44, Nicolas Saenz Julienne wrote:
>>> With the introduction of 55c7c0621078 ("ARM: dts: bcm283x: Fix vc4's
>>> firmware bus DMA limitations") the firmware bus has to comply with
>>> /soc's DMA limitations. Ultimately linking both buses to a same
>>> dma-ranges property. The patch (and author) missed the fact that a bus'
>>> #address-cells and #size-cells properties are not inherited, but set to
>>> a fixed value which, in this case, doesn't match /soc's. This, although
>>> not breaking Linux's DMA mapping functionality, generates ugly dtc
>>> warnings.
>>>
>>> Fix the issue by adding the correct address and size cells properties
>>> under the firmware bus.
>>>
>>> Fixes: 55c7c0621078 ("ARM: dts: bcm283x: Fix vc4's firmware bus DMA limitations")
>>> Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
>>
>> Reviewed-by: Matthias Brugger <mbrugger@suse.com>
> 
> Should this be squashed into "ARM: dts: bcm283x: Fix vc4's firmware bus
> DMA limitations"? I have not gotten a response it has been accepted yet.
> 

Well I think if we can squash the two instead of providing a Fixes-tag, even better.

Regards,
Matthias