linux-kernel - Re: [PATCH v8 6/7] arm64: dts: add dts nodes for MT6779

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Date:   Mon, 20 Jul 2020 18:13:46 +0200
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     Hanks Chen <hanks.chen@...iatek.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Sean Wang <sean.wang@...nel.org>,
        mtk01761 <wendell.lin@...iatek.com>,
        Andy Teng <andy.teng@...iatek.com>, linux-gpio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        wsd_upstream@...iatek.com, CC Hwang <cc.hwang@...iatek.com>,
        Loda Chou <loda.chou@...iatek.com>
Subject: Re: [PATCH v8 6/7] arm64: dts: add dts nodes for MT6779



On 16/07/2020 06:04, Hanks Chen wrote:
> On Tue, 2020-07-14 at 20:14 +0200, Matthias Brugger wrote:
>>
>> On 14/07/2020 11:20, Hanks Chen wrote:
>>> this adds initial MT6779 dts settings for board support,
>>> including cpu, gic, timer, ccf, pinctrl, uart, sysirq...etc.
>>>
>>> Signed-off-by: Hanks Chen <hanks.chen@...iatek.com>
>>> ---
>>>    arch/arm64/boot/dts/mediatek/Makefile       |   1 +
>>>    arch/arm64/boot/dts/mediatek/mt6779-evb.dts |  31 +++
>>>    arch/arm64/boot/dts/mediatek/mt6779.dtsi    | 271 ++++++++++++++++++++
>>>    3 files changed, 303 insertions(+)
>>>    create mode 100644 arch/arm64/boot/dts/mediatek/mt6779-evb.dts
>>>    create mode 100644 arch/arm64/boot/dts/mediatek/mt6779.dtsi
>>>
>> [...]
>>> +
>>> +		uart0: serial@...02000 {
>>> +			compatible = "mediatek,mt6779-uart",
>>> +				     "mediatek,mt6577-uart";
>>> +			reg = <0 0x11002000 0 0x400>;
>>> +			interrupts = <GIC_SPI 115 IRQ_TYPE_LEVEL_LOW>;
>>> +			clocks = <&clk26m>, <&infracfg_ao CLK_INFRA_UART0>;
>>> +			clock-names = "baud", "bus";
>>> +			status = "disabled";
>>> +		};
>>> +
>>> +		uart1: serial@...03000 {
>>> +			compatible = "mediatek,mt6779-uart",
>>> +				     "mediatek,mt6577-uart";
>>> +			reg = <0 0x11003000 0 0x400>;
>>> +			interrupts = <GIC_SPI 116 IRQ_TYPE_LEVEL_LOW>;
>>> +			clocks = <&clk26m>, <&infracfg_ao CLK_INFRA_UART1>;
>>> +			clock-names = "baud", "bus";
>>> +			status = "disabled";
>>> +		};
>>> +
>>> +		uart2: serial@...04000 {
>>> +			compatible = "mediatek,mt6779-uart",
>>> +				     "mediatek,mt6577-uart";
>>> +			reg = <0 0x11004000 0 0x400>;
>>> +			interrupts = <GIC_SPI 117 IRQ_TYPE_LEVEL_LOW>;
>>> +			clocks = <&clk26m>, <&infracfg_ao CLK_INFRA_UART2>;
>>> +			clock-names = "baud", "bus";
>>> +			status = "disabled";
>>> +		};
>>
>> Devicetree describes the HW we have. As far as I know, we have 4 UARTs on
>> MT6779. So we should list them all here.
>>
> 
> Actually, We have only 3 UARTs HW on MT6779, but have 4 UART clk in
> header file of clk.

Correct, I got confused by the four clocks.
With that clarified I'm fine with the patch and will take it as soon as the 
clock driver patch is accepted.

Regards,
Matthias

> CLK_INFRA_UART3 is a dummy clk interface, it has no effect on the
> operation of the read/write instruction.
> 
> If you think it is not good, I can remove it in the header file of clk.
> 
> Thanks
> 
>> Regards,
>> Matthias
>