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Document available properties for Tegra I2C controllers. Signed-off-by: Krishna Yarlagadda --- .../bindings/i2c/nvidia,tegra20-i2c.yaml | 104 ++++++++++++++++++ 1 file changed, 104 insertions(+) diff --git a/Documentation/devicetree/bindings/i2c/nvidia,tegra20-i2c.yaml b/Documentation/devicetree/bindings/i2c/nvidia,tegra20-i2c.yaml index 424a4fc218b6..3b22e75e5aa0 100644 --- a/Documentation/devicetree/bindings/i2c/nvidia,tegra20-i2c.yaml +++ b/Documentation/devicetree/bindings/i2c/nvidia,tegra20-i2c.yaml @@ -119,6 +119,96 @@ properties: - const: rx - const: tx + config: + description: Config settings for I2C devices enlisted with I2C controller. + Config setting is the configuration based on chip/board/system + characterization on interface/controller settings. This is needed for + - making the controller internal configuration to better perform + - making the interface to work proper by setting drive strength, slew + rates etc + - making the low power leakage. + There are two types of recommended configuration settings + - Controller register specific for internal operation of controller. + - Pad control/Pinmux/pincontrol registers for interfacing. + These configurations can further be categorized as static and dynamic. + - Static config does not change until a controller is reset. + - Dynamic config changes based on mode or condition, controller is + operating in. + I2C has configuration based on clock speed and has below modes. + - common is set on all speeds and can be overridden by speed mode. + - high is set when clock mode is high speed. + - fastplus is set when clock mode is fast plus. + - fast is set when clock mode is fast mode. + - standard is set when clock mode is standard mode. + $ref: /schemas/misc/nvidia,tegra-config-settings.yaml + unevaluatedProperties: false + properties: + nvidia,i2c-clk-divisor-hs-mode: + description: I2C clock divisor for HS mode. + $ref: /schemas/types.yaml#/definitions/uint32 + minimum: 0 + maximum: 0xffff + nvidia,i2c-clk-divisor-fs-mode: + description: I2C clock divisor for FS mode. + $ref: /schemas/types.yaml#/definitions/uint32 + minimum: 0 + maximum: 0xffff + nvidia,i2c-hs-sclk-high-period: + description: I2C high speed sclk high period. + $ref: /schemas/types.yaml#/definitions/uint32 + minimum: 0 + maximum: 0xffff + nvidia,i2c-hs-sclk-low-period: + description: I2C high speed sclk low period. + $ref: /schemas/types.yaml#/definitions/uint32 + minimum: 0 + maximum: 0xffff + nvidia,i2c-hs-stop-setup-time: + description: I2C high speed stop setup time. + $ref: /schemas/types.yaml#/definitions/uint32 + minimum: 0 + maximum: 0xffff + nvidia,i2c-hs-start-hold-time: + description: I2C high speed start hold time. + $ref: /schemas/types.yaml#/definitions/uint32 + minimum: 0 + maximum: 0xffff + nvidia,i2c-hs-start-setup-time: + description: I2C high speed start setup time. + $ref: /schemas/types.yaml#/definitions/uint32 + minimum: 0 + maximum: 0xffff + nvidia,i2c-sclk-high-period: + description: I2C sclk high period. + $ref: /schemas/types.yaml#/definitions/uint32 + minimum: 0 + maximum: 0xffff + nvidia,i2c-sclk-low-period: + description: I2C sclk low period. + $ref: /schemas/types.yaml#/definitions/uint32 + minimum: 0 + maximum: 0xffff + nvidia,i2c-bus-free-time: + description: I2C bus free time. + $ref: /schemas/types.yaml#/definitions/uint32 + minimum: 0 + maximum: 0xffff + nvidia,i2c-stop-setup-time: + description: I2C stop setup time. + $ref: /schemas/types.yaml#/definitions/uint32 + minimum: 0 + maximum: 0xffff + nvidia,i2c-start-hold-time: + description: I2C start hold time. + $ref: /schemas/types.yaml#/definitions/uint32 + minimum: 0 + maximum: 0xffff + nvidia,i2c-start-setup-time: + description: I2C start setup time. + $ref: /schemas/types.yaml#/definitions/uint32 + minimum: 0 + maximum: 0xffff + allOf: - $ref: /schemas/i2c/i2c-controller.yaml - if: @@ -189,4 +279,18 @@ examples: #address-cells = <1>; #size-cells = <0>; + config { + common { + nvidia,i2c-hs-sclk-high-period = <0x03>; + nvidia,i2c-hs-sclk-low-period = <0x08>; + }; + fast { + nvidia,i2c-clk-divisor-fs-mode = <0x3c>; + nvidia,i2c-sclk-high-period = <0x02>; + }; + fastplus { + nvidia,i2c-clk-divisor-fs-mode = <0x4f>; + nvidia,i2c-sclk-high-period = <0x07>; + }; + }; };