linux-kernel - Re: [RFC 1/3] dt-bindings: iommu: Add bindings for samsung,sysmmu-v8

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Message-ID: <9a006308-cabb-7ee2-0556-860d425b251f@canonical.com>
Date:   Fri, 21 Jan 2022 09:26:01 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     Sam Protsenko <semen.protsenko@...aro.org>,
        Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>
Cc:     Sumit Semwal <sumit.semwal@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Cho KyongHo <pullip.cho@...sung.com>,
        Hyesoo Yu <hyesoo.yu@...sung.com>,
        Janghyuck Kim <janghyuck.kim@...sung.com>,
        Jinkyu Yang <jinkyu1.yang@...sung.com>,
        Alex <acnwigwe@...gle.com>, Carlos Llamas <cmllamas@...gle.com>,
        Daniel Mentz <danielmentz@...gle.com>,
        Erick Reyes <erickreyes@...gle.com>,
        "J . Avila" <elavila@...gle.com>, Jonglin Lee <jonglin@...gle.com>,
        Mark Salyzyn <salyzyn@...gle.com>,
        Thierry Strudel <tstrudel@...gle.com>,
        Will McVicker <willmcvicker@...gle.com>,
        Shawn Guo <shawnguo@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        linux-samsung-soc@...r.kernel.org,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [RFC 1/3] dt-bindings: iommu: Add bindings for samsung,sysmmu-v8

On 20/01/2022 21:19, Sam Protsenko wrote:
> Only example of usage and header for now.
> 
> Signed-off-by: Sam Protsenko <semen.protsenko@...aro.org>
> ---
>  .../bindings/iommu/samsung,sysmmu-v8.txt      | 31 +++++++++++++

Please, don't copy paste bindings or entire drviers from vendor kernel.
It looks very bad. Instead, submit them in dtschema.

NAK.

>  include/dt-bindings/soc/samsung,sysmmu-v8.h   | 43 +++++++++++++++++++
>  2 files changed, 74 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iommu/samsung,sysmmu-v8.txt
>  create mode 100644 include/dt-bindings/soc/samsung,sysmmu-v8.h
> 
> diff --git a/Documentation/devicetree/bindings/iommu/samsung,sysmmu-v8.txt b/Documentation/devicetree/bindings/iommu/samsung,sysmmu-v8.txt
> new file mode 100644
> index 000000000000..d6004ea4a746
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iommu/samsung,sysmmu-v8.txt
> @@ -0,0 +1,31 @@
> +Example (Exynos850, IOMMU for DPU usage):
> +
> +	#include <dt-bindings/soc/samsung,sysmmu-v8.h>
> +
> +	/* IOMMU group info */
> +	iommu_group_dpu: iommu_group_dpu {
> +		compatible = "samsung,sysmmu-group";
> +	};
> +
> +	sysmmu_dpu: sysmmu@...c0000 {
> +		compatible = "samsung,sysmmu-v8";
> +		reg = <0x130c0000 0x9000>;
> +		interrupts = <GIC_SPI 122 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 123 IRQ_TYPE_LEVEL_HIGH>;
> +		qos = <15>;
> +
> +		clocks = <&cmu_dpu CLK_GOUT_DPU_SMMU_CLK>;
> +		clock-names = "gate";
> +
> +		sysmmu,secure-irq;
> +		sysmmu,secure_base = <0x130d0000>;
> +		sysmmu,default_tlb = <TLB_CFG(BL1, PREFETCH_PREDICTION)>;
> +		sysmmu,tlb_property =
> +			<1 TLB_CFG(BL1, PREFETCH_PREDICTION) (DIR_READ | (1 << 16)) SYSMMU_ID_MASK(0x2, 0xF)>,
> +			<2 TLB_CFG(BL1, PREFETCH_PREDICTION) (DIR_READ | (1 << 16)) SYSMMU_ID_MASK(0x4, 0xF)>,
> +			<3 TLB_CFG(BL1, PREFETCH_PREDICTION) (DIR_READ | (1 << 16)) SYSMMU_ID_MASK(0x6, 0xF)>,
> +			<4 TLB_CFG(BL1, PREFETCH_PREDICTION) (DIR_READ | (1 << 16)) SYSMMU_ID_MASK(0x8, 0xF)>;
> +		port-name = "DPU";
> +		#iommu-cells = <0>;
> +		//power-domains = <&pd_dpu>;

We try not to store dead code in kernel.



Best regards,
Krzysztof