linux-kernel - Re: [PATCH] ARM: dts: rockchip: use DMA channels for UARTs of TinkerBoard

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Message-ID: <0b36bf84-0e7b-7287-a094-9fd2f33167ee@katsuster.net>
Date:   Sun, 15 Mar 2020 18:44:13 +0900
From:   Katsuhiro Suzuki <katsuhiro@...suster.net>
To:     Heiko Stübner <heiko@...ech.de>
Cc:     linux-rockchip@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: dts: rockchip: use DMA channels for UARTs of
 TinkerBoard

Hello Heiko,

> This belongs in rk3288.dtsi, as this is definitly not board-specific, as
> the dma-uart connection is done inside the soc.
> 
> At least on arm64 (rk3328, px30, probably more) we already have the
> uart dmas in the core dtsi without any problems.
> 
> Is there any reason why you only did add it to the tinker board only?

There is no special reason. Simply I don't have and not tested on other
boards of RK3288. But I hope these DMA settings can work correctly on
other boards.

I'll resend patch for rk3288.dtsi.

Best Regards,
Katsuhiro Suzuki


On 2020/03/15 0:09, Heiko Stübner wrote:
> Hi,
> 
> Am Samstag, 14. März 2020, 15:23:27 CET schrieb Katsuhiro Suzuki:
>> This patch enables to use DMAC for all UARTs that are connected to
>> dmac_peri core for TinkerBoard.
>>
>> Only uart2 is connected different DMAC (dmac_bus_s) so keep current
>> settings on this patch.
> 
> This belongs in rk3288.dtsi, as this is definitly not board-specific, as
> the dma-uart connection is done inside the soc.
> 
> At least on arm64 (rk3328, px30, probably more) we already have the
> uart dmas in the core dtsi without any problems.
> 
> Is there any reason why you only did add it to the tinker board only?
> 
> 
> Heiko
> 
> 
>> Signed-off-by: Katsuhiro Suzuki <katsuhiro@...suster.net>
>> ---
>>   arch/arm/boot/dts/rk3288-tinker.dtsi | 8 ++++++++
>>   1 file changed, 8 insertions(+)
>>
>> diff --git a/arch/arm/boot/dts/rk3288-tinker.dtsi b/arch/arm/boot/dts/rk3288-tinker.dtsi
>> index 312582c1bd37..6efabeaf3c6d 100644
>> --- a/arch/arm/boot/dts/rk3288-tinker.dtsi
>> +++ b/arch/arm/boot/dts/rk3288-tinker.dtsi
>> @@ -491,10 +491,14 @@ &tsadc {
>>   };
>>   
>>   &uart0 {
>> +	dmas = <&dmac_peri 1>, <&dmac_peri 2>;
>> +	dma-names = "tx", "rx";
>>   	status = "okay";
>>   };
>>   
>>   &uart1 {
>> +	dmas = <&dmac_peri 3>, <&dmac_peri 4>;
>> +	dma-names = "tx", "rx";
>>   	status = "okay";
>>   };
>>   
>> @@ -503,10 +507,14 @@ &uart2 {
>>   };
>>   
>>   &uart3 {
>> +	dmas = <&dmac_peri 7>, <&dmac_peri 8>;
>> +	dma-names = "tx", "rx";
>>   	status = "okay";
>>   };
>>   
>>   &uart4 {
>> +	dmas = <&dmac_peri 9>, <&dmac_peri 10>;
>> +	dma-names = "tx", "rx";
>>   	status = "okay";
>>   };
>>   
>>
> 
> 
> 
> 
>