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Date:   Tue, 10 Aug 2021 03:38:26 +0000
From:   Leo Li <leoyang.li@....com>
To:     "Leizhen (ThunderTown)" <thunder.leizhen@...wei.com>,
        Shawn Guo <shawnguo@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Kettenis <mark.kettenis@...all.nl>,
        devicetree <devicetree@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v2 1/1] arm64: dts: lx2160a: Fix the compatible string of
 LX2160A UART



> -----Original Message-----
> From: Leizhen (ThunderTown) <thunder.leizhen@...wei.com>
> Sent: Monday, August 9, 2021 8:28 PM
> To: Leo Li <leoyang.li@....com>; Shawn Guo <shawnguo@...nel.org>; Rob
> Herring <robh+dt@...nel.org>; Mark Kettenis <mark.kettenis@...all.nl>;
> devicetree <devicetree@...r.kernel.org>; linux-arm-kernel <linux-arm-
> kernel@...ts.infradead.org>; linux-kernel <linux-kernel@...r.kernel.org>
> Subject: Re: [PATCH v2 1/1] arm64: dts: lx2160a: Fix the compatible string of
> LX2160A UART
> 
> 
> 
> On 2021/8/10 6:52, Leo Li wrote:
> >
> >
> >> -----Original Message-----
> >> From: Zhen Lei <thunder.leizhen@...wei.com>
> >> Sent: Tuesday, June 15, 2021 8:16 AM
> >> To: Shawn Guo <shawnguo@...nel.org>; Leo Li <leoyang.li@....com>;
> Rob
> >> Herring <robh+dt@...nel.org>; Mark Kettenis
> >> <mark.kettenis@...all.nl>; devicetree <devicetree@...r.kernel.org>;
> >> linux-arm-kernel <linux-arm- kernel@...ts.infradead.org>;
> >> linux-kernel <linux-kernel@...r.kernel.org>
> >> Cc: Zhen Lei <thunder.leizhen@...wei.com>
> >> Subject: [PATCH v2 1/1] arm64: dts: lx2160a: Fix the compatible
> >> string of LX2160A UART
> >>
> >> Mark Kettenis told us that:
> >> According to the NXP documentation, the LX2160A has a real PL011 UART.
> >>
> >> Therefore, rewrite it to the compatible string of pl011. The property
> >> "current- speed" specific to "arm,sbsa-uart" is also deleted.
> >
> > Sorry that I missed the discussion on the v1.  But looks like this change
> breaks the LX2160 boot.  The AMBA matching doesn't seem to work.  And
> the console is not registered correctly.
> 
> https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flore.k
> ernel.org%2Flinux-arm-kernel%2Fcba3a29f-92b5-072a-9a27-
> 60240f072dad%40huawei.com%2F&amp;data=04%7C01%7Cleoyang.li%40nx
> p.com%7C9986b52f71724d7f6ae108d95b9e1d9b%7C686ea1d3bc2b4c6fa92cd
> 99c5c301635%7C0%7C0%7C637641556923909225%7CUnknown%7CTWFpbGZ
> sb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6M
> n0%3D%7C1000&amp;sdata=wReesSfMj1hV2iPTN0%2F%2B%2Fb%2BKJH8xF
> LLcDgOMfjx731I%3D&amp;reserved=0
> 
> Maybe we should fall back to v1.

I didn't look into the problem in detail.  Probably it is because of lacking the clock properties needed by the AMBA bus?

> 
> >
> > [    0.639055] OF: amba_device_add() failed (-2) for /soc/serial@...0000
> > [    0.645612] OF: amba_device_add() failed (-2) for /soc/serial@...0000
> >
> >>
> >> Suggested-by: Shawn Guo <shawnguo@...nel.org>
> >> Suggested-by: Mark Kettenis <mark.kettenis@...all.nl>
> >> Signed-off-by: Zhen Lei <thunder.leizhen@...wei.com>
> >> ---
> >>  arch/arm64/boot/dts/freescale/fsl-lx2160a.dtsi | 12 ++++--------
> >>  1 file changed, 4 insertions(+), 8 deletions(-)
> >>
> >> diff --git a/arch/arm64/boot/dts/freescale/fsl-lx2160a.dtsi
> >> b/arch/arm64/boot/dts/freescale/fsl-lx2160a.dtsi
> >> index c4b1a59ba424..d2e6f7285674 100644
> >> --- a/arch/arm64/boot/dts/freescale/fsl-lx2160a.dtsi
> >> +++ b/arch/arm64/boot/dts/freescale/fsl-lx2160a.dtsi
> >> @@ -920,34 +920,30 @@ QORIQ_CLK_PLL_DIV(8)>,
> >>  		};
> >>
> >>  		uart0: serial@...0000 {
> >> -			compatible = "arm,sbsa-uart","arm,pl011";
> >> +			compatible = "arm,pl011", "arm,primecell";
> >>  			reg = <0x0 0x21c0000 0x0 0x1000>;
> >>  			interrupts = <GIC_SPI 32 IRQ_TYPE_LEVEL_HIGH>;
> >> -			current-speed = <115200>;
> >>  			status = "disabled";
> >>  		};
> >>
> >>  		uart1: serial@...0000 {
> >> -			compatible = "arm,sbsa-uart","arm,pl011";
> >> +			compatible = "arm,pl011", "arm,primecell";
> >>  			reg = <0x0 0x21d0000 0x0 0x1000>;
> >>  			interrupts = <GIC_SPI 33 IRQ_TYPE_LEVEL_HIGH>;
> >> -			current-speed = <115200>;
> >>  			status = "disabled";
> >>  		};
> >>
> >>  		uart2: serial@...0000 {
> >> -			compatible = "arm,sbsa-uart","arm,pl011";
> >> +			compatible = "arm,pl011", "arm,primecell";
> >>  			reg = <0x0 0x21e0000 0x0 0x1000>;
> >>  			interrupts = <GIC_SPI 72 IRQ_TYPE_LEVEL_HIGH>;
> >> -			current-speed = <115200>;
> >>  			status = "disabled";
> >>  		};
> >>
> >>  		uart3: serial@...0000 {
> >> -			compatible = "arm,sbsa-uart","arm,pl011";
> >> +			compatible = "arm,pl011", "arm,primecell";
> >>  			reg = <0x0 0x21f0000 0x0 0x1000>;
> >>  			interrupts = <GIC_SPI 73 IRQ_TYPE_LEVEL_HIGH>;
> >> -			current-speed = <115200>;
> >>  			status = "disabled";
> >>  		};
> >>
> >> --
> >> 2.25.1
> >>
> >
> > .
> >

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