Re: [PATCH v4 2/2] arm64: dts: mt8173: Add I2C device node

From: Daniel Kurtz
Date: Thu Jun 18 2015 - 11:17:06 EST

On Wed, Jun 17, 2015 at 11:08 PM, Eddie Huang <eddie.huang@xxxxxxxxxxxx> wrote:
> Add MT8173 I2C device nodes, include I2C controllers and pins.
> MT8173 has six I2C controllers, from i2c0 to i2c6, exclude i2c5.
> The 6th I2C controller register base doesn't next to 5th I2C,
> and there is a hardware between 5th and 6th I2C controller. So
> SoC designer name 6th controller as "i2c6", not "i2c5".
>
> Signed-off-by: Eddie Huang <eddie.huang@xxxxxxxxxxxx>
> ---
> arch/arm64/boot/dts/mediatek/mt8173.dtsi | 144 +++++++++++++++++++++++++++++++
> 1 file changed, 144 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/mediatek/mt8173.dtsi b/arch/arm64/boot/dts/mediatek/mt8173.dtsi
> index b52ec43..1816c8f 100644
> --- a/arch/arm64/boot/dts/mediatek/mt8173.dtsi
> +++ b/arch/arm64/boot/dts/mediatek/mt8173.dtsi
> @@ -158,6 +158,54 @@
> interrupts = <GIC_SPI 145 IRQ_TYPE_LEVEL_HIGH>,
> <GIC_SPI 146 IRQ_TYPE_LEVEL_HIGH>,
> <GIC_SPI 147 IRQ_TYPE_LEVEL_HIGH>;
> +
> + i2c0_pins_a: i2c0 {
> + pins1 {
> + pinmux = <MT8173_PIN_45_SDA0__FUNC_SDA0>,
> + <MT8173_PIN_46_SCL0__FUNC_SCL0>;
> + bias-disable;
> + };
> + };
> +
> + i2c1_pins_a: i2c1 {
> + pins1 {
> + pinmux = <MT8173_PIN_125_SDA1__FUNC_SDA1>,
> + <MT8173_PIN_126_SCL1__FUNC_SCL1>;
> + bias-disable;
> + };
> + };
> +
> + i2c2_pins_a: i2c2 {
> + pins1 {
> + pinmux = <MT8173_PIN_43_SDA2__FUNC_SDA2>,
> + <MT8173_PIN_44_SCL2__FUNC_SCL2>;
> + bias-disable;
> + };
> + };
> +
> + i2c3_pins_a: i2c3 {
> + pins1 {
> + pinmux = <MT8173_PIN_106_SDA3__FUNC_SDA3>,
> + <MT8173_PIN_107_SCL3__FUNC_SCL3>;
> + bias-disable;
> + };
> + };
> +
> + i2c4_pins_a: i2c4 {
> + pins1 {
> + pinmux = <MT8173_PIN_133_SDA4__FUNC_SDA4>,
> + <MT8173_PIN_134_SCL4__FUNC_SCL4>;
> + bias-disable;
> + };
> + };
> +
> + i2c6_pins_a: i2c6 {
> + pins1 {
> + pinmux = <MT8173_PIN_100_MSDC2_DAT0__FUNC_SDA5>,
> + <MT8173_PIN_101_MSDC2_DAT1__FUNC_SCL5>;
> + bias-disable;
> + };
> + };
> };
>
> watchdog: watchdog@10007000 {
> @@ -229,6 +277,102 @@
> clocks = <&uart_clk>;
> status = "disabled";
> };
> +
> + i2c0: i2c@11007000 {
> + compatible = "mediatek,mt8173-i2c";
> + reg = <0 0x11007000 0 0x70>,
> + <0 0x11000100 0 0x80>;
> + interrupts = <GIC_SPI 76 IRQ_TYPE_LEVEL_LOW>;
> + clock-div = <16>;

According to the i2c-mt6577 dt binding:
- clock-div: the fixed value for frequency divider of clock source in i2c
module. Each IC may be different.

For other drivers I've seen this kind of hardware-specific value
implemented as a table in the driver that is indexed based on the
compatible.

Any particular reason to specify it here in every device tree node instead?

-Dan


> + clocks = <&pericfg CLK_PERI_I2C0>,
> + <&pericfg CLK_PERI_AP_DMA>;
> + clock-names = "main", "dma";
> + pinctrl-names = "default";
> + pinctrl-0 = <&i2c0_pins_a>;
> + #address-cells = <1>;
> + #size-cells = <0>;
> + status = "disabled";
> + };
> +
> + i2c1: i2c@11008000 {
> + compatible = "mediatek,mt8173-i2c";
> + reg = <0 0x11008000 0 0x70>,
> + <0 0x11000180 0 0x80>;
> + interrupts = <GIC_SPI 77 IRQ_TYPE_LEVEL_LOW>;
> + clock-div = <16>;
> + clocks = <&pericfg CLK_PERI_I2C1>,
> + <&pericfg CLK_PERI_AP_DMA>;
> + clock-names = "main", "dma";
> + pinctrl-names = "default";
> + pinctrl-0 = <&i2c1_pins_a>;
> + #address-cells = <1>;
> + #size-cells = <0>;
> + status = "disabled";
> + };
> +
> + i2c2: i2c@11009000 {
> + compatible = "mediatek,mt8173-i2c";
> + reg = <0 0x11009000 0 0x70>,
> + <0 0x11000200 0 0x80>;
> + interrupts = <GIC_SPI 78 IRQ_TYPE_LEVEL_LOW>;
> + clock-div = <16>;
> + clocks = <&pericfg CLK_PERI_I2C2>,
> + <&pericfg CLK_PERI_AP_DMA>;
> + clock-names = "main", "dma";
> + pinctrl-names = "default";
> + pinctrl-0 = <&i2c2_pins_a>;
> + #address-cells = <1>;
> + #size-cells = <0>;
> + status = "disabled";
> + };
> +
> + i2c3: i2c3@11010000 {
> + compatible = "mediatek,mt8173-i2c";
> + reg = <0 0x11010000 0 0x70>,
> + <0 0x11000280 0 0x80>;
> + interrupts = <GIC_SPI 79 IRQ_TYPE_LEVEL_LOW>;
> + clock-div = <16>;
> + clocks = <&pericfg CLK_PERI_I2C3>,
> + <&pericfg CLK_PERI_AP_DMA>;
> + clock-names = "main", "dma";
> + pinctrl-names = "default";
> + pinctrl-0 = <&i2c3_pins_a>;
> + #address-cells = <1>;
> + #size-cells = <0>;
> + status = "disabled";
> + };
> +
> + i2c4: i2c4@11011000 {
> + compatible = "mediatek,mt8173-i2c";
> + reg = <0 0x11011000 0 0x70>,
> + <0 0x11000300 0 0x80>;
> + interrupts = <GIC_SPI 80 IRQ_TYPE_LEVEL_LOW>;
> + clock-div = <16>;
> + clocks = <&pericfg CLK_PERI_I2C4>,
> + <&pericfg CLK_PERI_AP_DMA>;
> + clock-names = "main", "dma";
> + pinctrl-names = "default";
> + pinctrl-0 = <&i2c4_pins_a>;
> + #address-cells = <1>;
> + #size-cells = <0>;
> + status = "disabled";
> + };
> +
> + i2c6: i2c6@11013000 {
> + compatible = "mediatek,mt8173-i2c";
> + reg = <0 0x11013000 0 0x70>,
> + <0 0x11000080 0 0x80>;
> + interrupts = <GIC_SPI 82 IRQ_TYPE_LEVEL_LOW>;
> + clock-div = <16>;
> + clocks = <&pericfg CLK_PERI_I2C6>,
> + <&pericfg CLK_PERI_AP_DMA>;
> + clock-names = "main", "dma";
> + pinctrl-names = "default";
> + pinctrl-0 = <&i2c6_pins_a>;
> + #address-cells = <1>;
> + #size-cells = <0>;
> + status = "disabled";
> + };
> };
>
> };
> --
> 1.8.1.1.dirty
>
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