linux-kernel - Re: [PATCH v3 08/15] riscv: dts: canaan: fix the k210's timer nodes

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Message-ID: <20220630215155.xzhtfkolgy2iubqe@mobilestation>
Date:   Fri, 1 Jul 2022 00:51:55 +0300
From:   Serge Semin <fancer.lancer@...il.com>
To:     Conor Dooley <mail@...chuod.ie>
Cc:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Sam Ravnborg <sam@...nborg.org>,
        Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>,
        Vinod Koul <vkoul@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Palmer Dabbelt <palmer@...belt.com>,
        Palmer Dabbelt <palmer@...osinc.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Conor Dooley <conor.dooley@...rochip.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Niklas Cassel <niklas.cassel@....com>,
        Dillon Min <dillon.minfei@...il.com>,
        Jose Abreu <joabreu@...opsys.com>,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, dmaengine@...r.kernel.org,
        alsa-devel@...a-project.org, linux-spi@...r.kernel.org,
        linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v3 08/15] riscv: dts: canaan: fix the k210's timer nodes

On Wed, Jun 29, 2022 at 07:43:37PM +0100, Conor Dooley wrote:
> From: Conor Dooley <conor.dooley@...rochip.com>
> 
> The timers on the k210 have non standard interrupt configurations,
> which leads to dtbs_check warnings:
> 
> k210_generic.dtb: timer@...d0000: interrupts: [[14], [15]] is too long
> From schema: Documentation/devicetree/bindings/timer/snps,dw-apb-timer.yaml
> 
> Split the timer nodes in two, so that the second timer in the IP block
> can actually be accessed & in the process solve the dtbs_check warning.

Reviewed-by: Serge Semin <fancer.lancer@...il.com>

Just to note. IMO the DW APB Timer driver has been incorrectly
designed in the first place. The dts-node is supposed to describe the
whole IP-core timers set as the original Canaan k210 DT-file expected,
since there are common CSRs in the registers range, which currently
get to be unreachable. But since the DT-bindings has already been
defined that way in the framework of DW APB Timer driver alas there
is nothing we can do to fix it.

-Sergey

> 
> Signed-off-by: Conor Dooley <conor.dooley@...rochip.com>
> ---
>  arch/riscv/boot/dts/canaan/k210.dtsi | 46 +++++++++++++++++++++++-----
>  1 file changed, 38 insertions(+), 8 deletions(-)
> 
> diff --git a/arch/riscv/boot/dts/canaan/k210.dtsi b/arch/riscv/boot/dts/canaan/k210.dtsi
> index cd4eae82d8b2..72f70128d751 100644
> --- a/arch/riscv/boot/dts/canaan/k210.dtsi
> +++ b/arch/riscv/boot/dts/canaan/k210.dtsi
> @@ -319,28 +319,58 @@ fpioa: pinmux@...b0000 {
>  
>  			timer0: timer@...d0000 {
>  				compatible = "snps,dw-apb-timer";
> -				reg = <0x502D0000 0x100>;
> -				interrupts = <14>, <15>;
> +				reg = <0x502D0000 0x14>;
> +				interrupts = <14>;
>  				clocks = <&sysclk K210_CLK_TIMER0>,
>  					 <&sysclk K210_CLK_APB0>;
>  				clock-names = "timer", "pclk";
>  				resets = <&sysrst K210_RST_TIMER0>;
>  			};
>  
> -			timer1: timer@...e0000 {
> +			timer1: timer@...d0014 {
>  				compatible = "snps,dw-apb-timer";
> -				reg = <0x502E0000 0x100>;
> -				interrupts = <16>, <17>;
> +				reg = <0x502D0014 0x14>;
> +				interrupts = <15>;
> +				clocks = <&sysclk K210_CLK_TIMER0>,
> +					 <&sysclk K210_CLK_APB0>;
> +				clock-names = "timer", "pclk";
> +				resets = <&sysrst K210_RST_TIMER0>;
> +			};
> +
> +			timer2: timer@...e0000 {
> +				compatible = "snps,dw-apb-timer";
> +				reg = <0x502E0000 0x14>;
> +				interrupts = <16>;
>  				clocks = <&sysclk K210_CLK_TIMER1>,
>  					 <&sysclk K210_CLK_APB0>;
>  				clock-names = "timer", "pclk";
>  				resets = <&sysrst K210_RST_TIMER1>;
>  			};
>  
> -			timer2: timer@...f0000 {
> +			timer3: timer@...e0014 {
> +				compatible = "snps,dw-apb-timer";
> +				reg = <0x502E0014 0x114>;
> +				interrupts = <17>;
> +				clocks = <&sysclk K210_CLK_TIMER1>,
> +					 <&sysclk K210_CLK_APB0>;
> +				clock-names = "timer", "pclk";
> +				resets = <&sysrst K210_RST_TIMER1>;
> +			};
> +
> +			timer4: timer@...f0000 {
> +				compatible = "snps,dw-apb-timer";
> +				reg = <0x502F0000 0x14>;
> +				interrupts = <18>;
> +				clocks = <&sysclk K210_CLK_TIMER2>,
> +					 <&sysclk K210_CLK_APB0>;
> +				clock-names = "timer", "pclk";
> +				resets = <&sysrst K210_RST_TIMER2>;
> +			};
> +
> +			timer5: timer@...f0014 {
>  				compatible = "snps,dw-apb-timer";
> -				reg = <0x502F0000 0x100>;
> -				interrupts = <18>, <19>;
> +				reg = <0x502F0014 0x14>;
> +				interrupts = <19>;
>  				clocks = <&sysclk K210_CLK_TIMER2>,
>  					 <&sysclk K210_CLK_APB0>;
>  				clock-names = "timer", "pclk";
> -- 
> 2.36.1
>