linux-kernel - Re: [PATCH] ARC: [axs10x] enable DW DMA controller

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Date:	Sat, 5 Dec 2015 10:14:32 +0000
From:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
To:	Alexey Brodkin <Alexey.Brodkin@...opsys.com>,
	"linux-snps-arc@...ts.infradead.org" 
	<linux-snps-arc@...ts.infradead.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Nelson Pereira" <Nelson.Pereira@...opsys.com>,
	Joao Pinto <Joao.Pinto@...opsys.com>
Subject: Re: [PATCH] ARC: [axs10x] enable DW DMA controller

On Saturday 05 December 2015 12:52 AM, Alexey Brodkin wrote:
> From: Nelson Pereira <npereira@...opsys.com>
>
> ARC SDP baseboard among other peripherals sports
> DesignWare DMA controller.
>
> This enables support of that device.
> Note typically DW DMA controller is used with external devices
> connected to ARC SDP board via HAPS Extension bus.

Such a board config needs to have it's own defconfig / DT (if needed). There's no
point in enabling this for rest of the world who don't have a use case for this IP.

So nack !

-Vineet
>
> Signed-off-by: Nelson Pereira <npereira@...opsys.com>
> Cc: Vineet Gupta <vgupta@...opsys.com>
> Signed-off-by: Alexey Brodkin <abrodkin@...opsys.com>
> ---
>  arch/arc/boot/dts/axs10x_mb.dtsi      | 16 ++++++++++++++++
>  arch/arc/configs/axs101_defconfig     |  5 +++++
>  arch/arc/configs/axs103_defconfig     |  5 +++++
>  arch/arc/configs/axs103_smp_defconfig |  5 +++++
>  4 files changed, 31 insertions(+)
>
> diff --git a/arch/arc/boot/dts/axs10x_mb.dtsi b/arch/arc/boot/dts/axs10x_mb.dtsi
> index f3db321..1e57580 100644
> --- a/arch/arc/boot/dts/axs10x_mb.dtsi
> +++ b/arch/arc/boot/dts/axs10x_mb.dtsi
> @@ -220,5 +220,21 @@
>  				reg = <2>;
>  			};
>  		};
> +
> +		dmac: dmac@...0000 {
> +			compatible = "snps,dma-spear1340";
> +			reg = <0x80000 0x1000>;
> +			interrupts = <9>;
> +			dma-channels = <4>;
> +			dma-requests = <16>;
> +			dma-masters = <2>;
> +			#dma-cells = <3>;
> +			chan_allocation_order = <1>;
> +			chan_priority = <1>;
> +			block_size = <0xfff>;
> +			data_width = <3 3>;
> +			clocks = <&apbclk>;
> +			clock-names = "hclk";
> +		};
>  	};
>  };
> diff --git a/arch/arc/configs/axs101_defconfig b/arch/arc/configs/axs101_defconfig
> index 562dac6..405474f 100644
> --- a/arch/arc/configs/axs101_defconfig
> +++ b/arch/arc/configs/axs101_defconfig
> @@ -90,6 +90,11 @@ CONFIG_MMC_SDHCI=y
>  CONFIG_MMC_SDHCI_PLTFM=y
>  CONFIG_MMC_DW=y
>  CONFIG_MMC_DW_IDMAC=y
> +CONFIG_DMADEVICES=y
> +CONFIG_DW_DMAC_CORE=y
> +CONFIG_DW_DMAC=y
> +CONFIG_DMA_ENGINE=y
> +CONFIG_DMA_OF=y
>  # CONFIG_IOMMU_SUPPORT is not set
>  CONFIG_EXT3_FS=y
>  CONFIG_EXT4_FS=y
> diff --git a/arch/arc/configs/axs103_defconfig b/arch/arc/configs/axs103_defconfig
> index 83a6d8d..570f06f 100644
> --- a/arch/arc/configs/axs103_defconfig
> +++ b/arch/arc/configs/axs103_defconfig
> @@ -96,6 +96,11 @@ CONFIG_MMC_SDHCI=y
>  CONFIG_MMC_SDHCI_PLTFM=y
>  CONFIG_MMC_DW=y
>  CONFIG_MMC_DW_IDMAC=y
> +CONFIG_DMADEVICES=y
> +CONFIG_DW_DMAC_CORE=y
> +CONFIG_DW_DMAC=y
> +CONFIG_DMA_ENGINE=y
> +CONFIG_DMA_OF=y
>  # CONFIG_IOMMU_SUPPORT is not set
>  CONFIG_EXT3_FS=y
>  CONFIG_EXT4_FS=y
> diff --git a/arch/arc/configs/axs103_smp_defconfig b/arch/arc/configs/axs103_smp_defconfig
> index f1e1c84..16cfce8 100644
> --- a/arch/arc/configs/axs103_smp_defconfig
> +++ b/arch/arc/configs/axs103_smp_defconfig
> @@ -97,6 +97,11 @@ CONFIG_MMC_SDHCI=y
>  CONFIG_MMC_SDHCI_PLTFM=y
>  CONFIG_MMC_DW=y
>  CONFIG_MMC_DW_IDMAC=y
> +CONFIG_DMADEVICES=y
> +CONFIG_DW_DMAC_CORE=y
> +CONFIG_DW_DMAC=y
> +CONFIG_DMA_ENGINE=y
> +CONFIG_DMA_OF=y
>  # CONFIG_IOMMU_SUPPORT is not set
>  CONFIG_EXT3_FS=y
>  CONFIG_EXT4_FS=y

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