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Date:   Fri, 1 Jul 2022 00:51:55 +0300
From:   Serge Semin <fancer.lancer@gmail.com>
To:     Conor Dooley <mail@conchuod.ie>
Cc:     David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Thierry Reding <thierry.reding@gmail.com>,
        Sam Ravnborg <sam@ravnborg.org>,
        Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>,
        Vinod Koul <vkoul@kernel.org>,
        Liam Girdwood <lgirdwood@gmail.com>,
        Mark Brown <broonie@kernel.org>,
        Daniel Lezcano <daniel.lezcano@linaro.org>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Palmer Dabbelt <palmer@rivosinc.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        Conor Dooley <conor.dooley@microchip.com>,
        Masahiro Yamada <masahiroy@kernel.org>,
        Damien Le Moal <damien.lemoal@opensource.wdc.com>,
        Geert Uytterhoeven <geert@linux-m68k.org>,
        Niklas Cassel <niklas.cassel@wdc.com>,
        Dillon Min <dillon.minfei@gmail.com>,
        Jose Abreu <joabreu@synopsys.com>,
        dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, dmaengine@vger.kernel.org,
        alsa-devel@alsa-project.org, linux-spi@vger.kernel.org,
        linux-riscv@lists.infradead.org
Subject: Re: [PATCH v3 08/15] riscv: dts: canaan: fix the k210's timer nodes
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 <20220629184343.3438856-9-mail@conchuod.ie>
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On Wed, Jun 29, 2022 at 07:43:37PM +0100, Conor Dooley wrote:
> From: Conor Dooley <conor.dooley@microchip.com>
> 
> The timers on the k210 have non standard interrupt configurations,
> which leads to dtbs_check warnings:
> 
> k210_generic.dtb: timer@502d0000: 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@gmail.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@microchip.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@502b0000 {
>  
>  			timer0: timer@502d0000 {
>  				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@502e0000 {
> +			timer1: timer@502d0014 {
>  				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@502e0000 {
> +				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@502f0000 {
> +			timer3: timer@502e0014 {
> +				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@502f0000 {
> +				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@502f0014 {
>  				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
>