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Date: Tue, 23 Jan 2024 00:41:05 +0000
From: Andre Przywara <andre.przywara@arm.com>
To: Chen-Yu Tsai <wens@kernel.org>
Cc: Rob Herring <robh+dt@kernel.org>, Krzysztof Kozlowski
 <krzysztof.kozlowski+dt@linaro.org>, Conor Dooley <conor+dt@kernel.org>,
 Jernej Skrabec <jernej.skrabec@gmail.com>, Samuel Holland
 <samuel@sholland.org>, Liam Girdwood <lgirdwood@gmail.com>, Mark Brown
 <broonie@kernel.org>, Jaroslav Kysela <perex@perex.cz>, Takashi Iwai
 <tiwai@suse.com>, Vinod Koul <vkoul@kernel.org>, Chen-Yu Tsai
 <wens@csie.org>, devicetree@vger.kernel.org,
 linux-arm-kernel@lists.infradead.org, linux-sunxi@lists.linux.dev,
 linux-sound@vger.kernel.org, dmaengine@vger.kernel.org,
 linux-kernel@vger.kernel.org
Subject: Re: [PATCH 6/7] arm64: dts: allwinner: h616: Add DMA controller and
 DMA channels
Message-ID: <20240123004105.66fee7bd@minigeek.lan>
In-Reply-To: <20240122170518.3090814-7-wens@kernel.org>
References: <20240122170518.3090814-1-wens@kernel.org>
	<20240122170518.3090814-7-wens@kernel.org>
Organization: Arm Ltd.
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On Tue, 23 Jan 2024 01:05:17 +0800
Chen-Yu Tsai <wens@kernel.org> wrote:

> From: Chen-Yu Tsai <wens@csie.org>
> 
> The DMA controllers found on the H616 and H618 are the same as the one
> found on the H6. The only difference is the DMA endpoint (DRQ) layout.
> 
> Add a device node for it, and add DMA channels for existing peripherals.
> 
> Signed-off-by: Chen-Yu Tsai <wens@csie.org>
> ---
>  .../arm64/boot/dts/allwinner/sun50i-h616.dtsi | 39 +++++++++++++++++++
>  1 file changed, 39 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/allwinner/sun50i-h616.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-h616.dtsi
> index d549d277d972..a0268439f3be 100644
> --- a/arch/arm64/boot/dts/allwinner/sun50i-h616.dtsi
> +++ b/arch/arm64/boot/dts/allwinner/sun50i-h616.dtsi
> @@ -133,6 +133,19 @@ ccu: clock@3001000 {
>  			#reset-cells = <1>;
>  		};
>  
> +		dma: dma-controller@3002000 {
> +			compatible = "allwinner,sun50i-h616-dma",
> +				     "allwinner,sun50i-h6-dma";

This should include the A100, to cover 34 bits of address space, see
the binding patch comment.

> +			reg = <0x03002000 0x1000>;
> +			interrupts = <GIC_SPI 42 IRQ_TYPE_LEVEL_HIGH>;
> +			clocks = <&ccu CLK_BUS_DMA>, <&ccu CLK_MBUS_DMA>;
> +			clock-names = "bus", "mbus";
> +			dma-channels = <16>;
> +			dma-requests = <49>;
> +			resets = <&ccu RST_BUS_DMA>;
> +			#dma-cells = <1>;

I compared those bits against the manual and the clock driver: they are
correct.

> +		};
> +
>  		sid: efuse@3006000 {
>  			compatible = "allwinner,sun50i-h616-sid", "allwinner,sun50i-a64-sid";
>  			reg = <0x03006000 0x1000>;
> @@ -339,6 +352,8 @@ uart0: serial@5000000 {
>  			reg-shift = <2>;
>  			reg-io-width = <4>;
>  			clocks = <&ccu CLK_BUS_UART0>;
> +			dmas = <&dma 14>, <&dma 14>;
> +			dma-names = "tx", "rx";
>  			resets = <&ccu RST_BUS_UART0>;
>  			status = "disabled";
>  		};
> @@ -350,6 +365,8 @@ uart1: serial@5000400 {
>  			reg-shift = <2>;
>  			reg-io-width = <4>;
>  			clocks = <&ccu CLK_BUS_UART1>;
> +			dmas = <&dma 15>, <&dma 15>;
> +			dma-names = "tx", "rx";
>  			resets = <&ccu RST_BUS_UART1>;
>  			status = "disabled";
>  		};
> @@ -361,6 +378,8 @@ uart2: serial@5000800 {
>  			reg-shift = <2>;
>  			reg-io-width = <4>;
>  			clocks = <&ccu CLK_BUS_UART2>;
> +			dmas = <&dma 16>, <&dma 16>;
> +			dma-names = "tx", "rx";
>  			resets = <&ccu RST_BUS_UART2>;
>  			status = "disabled";
>  		};
> @@ -372,6 +391,8 @@ uart3: serial@5000c00 {
>  			reg-shift = <2>;
>  			reg-io-width = <4>;
>  			clocks = <&ccu CLK_BUS_UART3>;
> +			dmas = <&dma 17>, <&dma 17>;
> +			dma-names = "tx", "rx";
>  			resets = <&ccu RST_BUS_UART3>;
>  			status = "disabled";
>  		};
> @@ -383,6 +404,8 @@ uart4: serial@5001000 {
>  			reg-shift = <2>;
>  			reg-io-width = <4>;
>  			clocks = <&ccu CLK_BUS_UART4>;
> +			dmas = <&dma 18>, <&dma 18>;
> +			dma-names = "tx", "rx";
>  			resets = <&ccu RST_BUS_UART4>;
>  			status = "disabled";
>  		};
> @@ -394,6 +417,8 @@ uart5: serial@5001400 {
>  			reg-shift = <2>;
>  			reg-io-width = <4>;
>  			clocks = <&ccu CLK_BUS_UART5>;
> +			dmas = <&dma 19>, <&dma 19>;
> +			dma-names = "tx", "rx";
>  			resets = <&ccu RST_BUS_UART5>;
>  			status = "disabled";
>  		};
> @@ -405,6 +430,8 @@ i2c0: i2c@5002000 {
>  			reg = <0x05002000 0x400>;
>  			interrupts = <GIC_SPI 6 IRQ_TYPE_LEVEL_HIGH>;
>  			clocks = <&ccu CLK_BUS_I2C0>;
> +			dmas = <&dma 43>, <&dma 43>;
> +			dma-names = "rx", "tx";
>  			resets = <&ccu RST_BUS_I2C0>;
>  			pinctrl-names = "default";
>  			pinctrl-0 = <&i2c0_pins>;
> @@ -420,6 +447,8 @@ i2c1: i2c@5002400 {
>  			reg = <0x05002400 0x400>;
>  			interrupts = <GIC_SPI 7 IRQ_TYPE_LEVEL_HIGH>;
>  			clocks = <&ccu CLK_BUS_I2C1>;
> +			dmas = <&dma 44>, <&dma 44>;
> +			dma-names = "rx", "tx";
>  			resets = <&ccu RST_BUS_I2C1>;
>  			status = "disabled";
>  			#address-cells = <1>;
> @@ -433,6 +462,8 @@ i2c2: i2c@5002800 {
>  			reg = <0x05002800 0x400>;
>  			interrupts = <GIC_SPI 8 IRQ_TYPE_LEVEL_HIGH>;
>  			clocks = <&ccu CLK_BUS_I2C2>;
> +			dmas = <&dma 45>, <&dma 45>;
> +			dma-names = "rx", "tx";
>  			resets = <&ccu RST_BUS_I2C2>;
>  			status = "disabled";
>  			#address-cells = <1>;
> @@ -446,6 +477,8 @@ i2c3: i2c@5002c00 {
>  			reg = <0x05002c00 0x400>;
>  			interrupts = <GIC_SPI 9 IRQ_TYPE_LEVEL_HIGH>;
>  			clocks = <&ccu CLK_BUS_I2C3>;
> +			dmas = <&dma 46>, <&dma 46>;
> +			dma-names = "rx", "tx";
>  			resets = <&ccu RST_BUS_I2C3>;
>  			status = "disabled";
>  			#address-cells = <1>;
> @@ -459,6 +492,8 @@ i2c4: i2c@5003000 {
>  			reg = <0x05003000 0x400>;
>  			interrupts = <GIC_SPI 10 IRQ_TYPE_LEVEL_HIGH>;
>  			clocks = <&ccu CLK_BUS_I2C4>;
> +			dmas = <&dma 47>, <&dma 47>;
> +			dma-names = "rx", "tx";
>  			resets = <&ccu RST_BUS_I2C4>;
>  			status = "disabled";
>  			#address-cells = <1>;

The manual mentions "S_TWI0" using port48, so should we add dma
properties to the r_i2c node as well?

I compared all the other port numbers against the manual, they match.

Cheers,
Andre

i
> @@ -472,6 +507,8 @@ spi0: spi@5010000 {
>  			interrupts = <GIC_SPI 12 IRQ_TYPE_LEVEL_HIGH>;
>  			clocks = <&ccu CLK_BUS_SPI0>, <&ccu CLK_SPI0>;
>  			clock-names = "ahb", "mod";
> +			dmas = <&dma 22>, <&dma 22>;
> +			dma-names = "rx", "tx";
>  			resets = <&ccu RST_BUS_SPI0>;
>  			status = "disabled";
>  			#address-cells = <1>;
> @@ -485,6 +522,8 @@ spi1: spi@5011000 {
>  			interrupts = <GIC_SPI 13 IRQ_TYPE_LEVEL_HIGH>;
>  			clocks = <&ccu CLK_BUS_SPI1>, <&ccu CLK_SPI1>;
>  			clock-names = "ahb", "mod";
> +			dmas = <&dma 23>, <&dma 23>;
> +			dma-names = "rx", "tx";
>  			resets = <&ccu RST_BUS_SPI1>;
>  			status = "disabled";
>  			#address-cells = <1>;