diff options
Diffstat (limited to 'Documentation/devicetree/bindings/i2c')
12 files changed, 233 insertions, 12 deletions
diff --git a/Documentation/devicetree/bindings/i2c/i2c-arb-gpio-challenge.txt b/Documentation/devicetree/bindings/i2c/i2c-arb-gpio-challenge.txt index 1ac8ea8ade1d..bfeabb843941 100644 --- a/Documentation/devicetree/bindings/i2c/i2c-arb-gpio-challenge.txt +++ b/Documentation/devicetree/bindings/i2c/i2c-arb-gpio-challenge.txt @@ -8,6 +8,12 @@ the standard I2C multi-master rules. Using GPIOs is generally useful in the case where there is a device on the bus that has errata and/or bugs that makes standard multimaster mode not feasible. +Note that this scheme works well enough but has some downsides: +* It is nonstandard (not using standard I2C multimaster) +* Having two masters on a bus in general makes it relatively hard to debug + problems (hard to tell if i2c issues were caused by one master, another, or + some device on the bus). + Algorithm: diff --git a/Documentation/devicetree/bindings/i2c/i2c-at91.txt b/Documentation/devicetree/bindings/i2c/i2c-at91.txt index 4fade84bea16..388f0a275fba 100644 --- a/Documentation/devicetree/bindings/i2c/i2c-at91.txt +++ b/Documentation/devicetree/bindings/i2c/i2c-at91.txt @@ -12,6 +12,7 @@ Required properties : - clocks: phandles to input clocks. Optional properties: +- clock-frequency: Desired I2C bus frequency in Hz, otherwise defaults to 100000 - Child nodes conforming to i2c bus binding Examples : @@ -23,6 +24,7 @@ i2c0: i2c@fff84000 { #address-cells = <1>; #size-cells = <0>; clocks = <&twi0_clk>; + clock-frequency = <400000>; 24c512@50 { compatible = "24c512"; diff --git a/Documentation/devicetree/bindings/i2c/i2c-cadence.txt b/Documentation/devicetree/bindings/i2c/i2c-cadence.txt new file mode 100644 index 000000000000..7cb0b5608f49 --- /dev/null +++ b/Documentation/devicetree/bindings/i2c/i2c-cadence.txt @@ -0,0 +1,24 @@ +Binding for the Cadence I2C controller + +Required properties: + - reg: Physical base address and size of the controller's register area. + - compatible: Compatibility string. Must be 'cdns,i2c-r1p10'. + - clocks: Input clock specifier. Refer to common clock bindings. + - interrupts: Interrupt specifier. Refer to interrupt bindings. + - #address-cells: Should be 1. + - #size-cells: Should be 0. + +Optional properties: + - clock-frequency: Desired operating frequency, in Hz, of the bus. + - clock-names: Input clock name, should be 'pclk'. + +Example: + i2c@e0004000 { + compatible = "cdns,i2c-r1p10"; + clocks = <&clkc 38>; + interrupts = <GIC_SPI 25 IRQ_TYPE_LEVEL_HIGH>; + reg = <0xe0004000 0x1000>; + clock-frequency = <400000>; + #address-cells = <1>; + #size-cells = <0>; + }; diff --git a/Documentation/devicetree/bindings/i2c/i2c-cros-ec-tunnel.txt b/Documentation/devicetree/bindings/i2c/i2c-cros-ec-tunnel.txt new file mode 100644 index 000000000000..898f030eba62 --- /dev/null +++ b/Documentation/devicetree/bindings/i2c/i2c-cros-ec-tunnel.txt @@ -0,0 +1,39 @@ +I2C bus that tunnels through the ChromeOS EC (cros-ec) +====================================================== +On some ChromeOS board designs we've got a connection to the EC (embedded +controller) but no direct connection to some devices on the other side of +the EC (like a battery and PMIC). To get access to those devices we need +to tunnel our i2c commands through the EC. + +The node for this device should be under a cros-ec node like google,cros-ec-spi +or google,cros-ec-i2c. + + +Required properties: +- compatible: google,cros-ec-i2c-tunnel +- google,remote-bus: The EC bus we'd like to talk to. + +Optional child nodes: +- One node per I2C device connected to the tunnelled I2C bus. + + +Example: + cros-ec@0 { + compatible = "google,cros-ec-spi"; + + ... + + i2c-tunnel { + compatible = "google,cros-ec-i2c-tunnel"; + #address-cells = <1>; + #size-cells = <0>; + + google,remote-bus = <0>; + + battery: sbs-battery@b { + compatible = "sbs,sbs-battery"; + reg = <0xb>; + sbs,poll-retry-count = <1>; + }; + }; + } diff --git a/Documentation/devicetree/bindings/i2c/i2c-designware.txt b/Documentation/devicetree/bindings/i2c/i2c-designware.txt index 7fd7fa25e9b0..5199b0c8cf7a 100644 --- a/Documentation/devicetree/bindings/i2c/i2c-designware.txt +++ b/Documentation/devicetree/bindings/i2c/i2c-designware.txt @@ -14,6 +14,12 @@ Optional properties : - i2c-sda-hold-time-ns : should contain the SDA hold time in nanoseconds. This option is only supported in hardware blocks version 1.11a or newer. + - i2c-scl-falling-time : should contain the SCL falling time in nanoseconds. + This value which is by default 300ns is used to compute the tLOW period. + + - i2c-sda-falling-time : should contain the SDA falling time in nanoseconds. + This value which is by default 300ns is used to compute the tHIGH period. + Example : i2c@f0000 { @@ -34,4 +40,6 @@ Example : interrupts = <12 1>; clock-frequency = <400000>; i2c-sda-hold-time-ns = <300>; + i2c-sda-falling-time-ns = <300>; + i2c-scl-falling-time-ns = <300>; }; diff --git a/Documentation/devicetree/bindings/i2c/i2c-efm32.txt b/Documentation/devicetree/bindings/i2c/i2c-efm32.txt new file mode 100644 index 000000000000..fc15ac519437 --- /dev/null +++ b/Documentation/devicetree/bindings/i2c/i2c-efm32.txt @@ -0,0 +1,34 @@ +* Energymicro efm32 i2c controller + +Required properties : + + - reg : Offset and length of the register set for the device + - compatible : should be "energymicro,efm32-i2c" + - interrupts : the interrupt number + - clocks : reference to the module clock + +Recommended properties : + + - clock-frequency : maximal I2C bus clock frequency in Hz. + - efm32,location : Decides the location of the USART I/O pins. + Allowed range : [0 .. 6] + +Example: + i2c0: i2c@4000a000 { + #address-cells = <1>; + #size-cells = <0>; + compatible = "energymicro,efm32-i2c"; + reg = <0x4000a000 0x400>; + interrupts = <9>; + clocks = <&cmu clk_HFPERCLKI2C0>; + clock-frequency = <100000>; + status = "ok"; + efm32,location = <3>; + + eeprom@50 { + compatible = "microchip,24c02"; + reg = <0x50>; + pagesize = <16>; + }; + }; + diff --git a/Documentation/devicetree/bindings/i2c/i2c-exynos5.txt b/Documentation/devicetree/bindings/i2c/i2c-exynos5.txt index 056732cfdcee..d4745e31f5c6 100644 --- a/Documentation/devicetree/bindings/i2c/i2c-exynos5.txt +++ b/Documentation/devicetree/bindings/i2c/i2c-exynos5.txt @@ -5,7 +5,14 @@ at various speeds ranging from 100khz to 3.4Mhz. Required properties: - compatible: value should be. - -> "samsung,exynos5-hsi2c", for i2c compatible with exynos5 hsi2c. + -> "samsung,exynos5-hsi2c", (DEPRECATED) + for i2c compatible with HSI2C available + on Exynos5250 and Exynos5420 SoCs. + -> "samsung,exynos5250-hsi2c", for i2c compatible with HSI2C available + on Exynos5250 and Exynos5420 SoCs. + -> "samsung,exynos5260-hsi2c", for i2c compatible with HSI2C available + on Exynos5260 SoCs. + - reg: physical base address of the controller and length of memory mapped region. - interrupts: interrupt number to the cpu. @@ -26,7 +33,7 @@ Optional properties: Example: hsi2c@12ca0000 { - compatible = "samsung,exynos5-hsi2c"; + compatible = "samsung,exynos5250-hsi2c"; reg = <0x12ca0000 0x100>; interrupts = <56>; clock-frequency = <100000>; diff --git a/Documentation/devicetree/bindings/i2c/i2c-mv64xxx.txt b/Documentation/devicetree/bindings/i2c/i2c-mv64xxx.txt index 582b4652a82a..5c30026921ae 100644 --- a/Documentation/devicetree/bindings/i2c/i2c-mv64xxx.txt +++ b/Documentation/devicetree/bindings/i2c/i2c-mv64xxx.txt @@ -4,12 +4,16 @@ Required properties : - reg : Offset and length of the register set for the device - - compatible : Should be "marvell,mv64xxx-i2c" or "allwinner,sun4i-i2c" - or "marvell,mv78230-i2c" or "marvell,mv78230-a0-i2c" - Note: Only use "marvell,mv78230-a0-i2c" for a very rare, - initial version of the SoC which had broken offload - support. Linux auto-detects this and sets it - appropriately. + - compatible : Should be either: + - "allwinner,sun4i-a10-i2c" + - "allwinner,sun6i-a31-i2c" + - "marvell,mv64xxx-i2c" + - "marvell,mv78230-i2c" + - "marvell,mv78230-a0-i2c" + * Note: Only use "marvell,mv78230-a0-i2c" for a + very rare, initial version of the SoC which + had broken offload support. Linux + auto-detects this and sets it appropriately. - interrupts : The interrupt number Optional properties : @@ -17,6 +21,10 @@ Optional properties : - clock-frequency : Desired I2C bus clock frequency in Hz. If not set the default frequency is 100kHz + - resets : phandle to the parent reset controller. Mandatory + whenever you're using the "allwinner,sun6i-a31-i2c" + compatible. + Examples: i2c@11000 { diff --git a/Documentation/devicetree/bindings/i2c/i2c-rcar.txt b/Documentation/devicetree/bindings/i2c/i2c-rcar.txt index 897cfcd5ce92..16b3e07aa98f 100644 --- a/Documentation/devicetree/bindings/i2c/i2c-rcar.txt +++ b/Documentation/devicetree/bindings/i2c/i2c-rcar.txt @@ -6,6 +6,10 @@ Required properties: "renesas,i2c-r8a7778" "renesas,i2c-r8a7779" "renesas,i2c-r8a7790" + "renesas,i2c-r8a7791" + "renesas,i2c-r8a7792" + "renesas,i2c-r8a7793" + "renesas,i2c-r8a7794" - reg: physical base address of the controller and length of memory mapped region. - interrupts: interrupt specifier. @@ -13,11 +17,16 @@ Required properties: Optional properties: - clock-frequency: desired I2C bus clock frequency in Hz. The absence of this propoerty indicates the default frequency 100 kHz. +- clocks: clock specifier. Examples : -i2c0: i2c@e6500000 { - compatible = "renesas,i2c-rcar-h2"; - reg = <0 0xe6500000 0 0x428>; - interrupts = <0 174 0x4>; +i2c0: i2c@e6508000 { + #address-cells = <1>; + #size-cells = <0>; + compatible = "renesas,i2c-r8a7791"; + reg = <0 0xe6508000 0 0x40>; + interrupts = <0 287 IRQ_TYPE_LEVEL_HIGH>; + clocks = <&mstp9_clks R8A7791_CLK_I2C0>; + clock-frequency = <400000>; }; diff --git a/Documentation/devicetree/bindings/i2c/i2c-sh_mobile.txt b/Documentation/devicetree/bindings/i2c/i2c-sh_mobile.txt new file mode 100644 index 000000000000..d2153ce36fa8 --- /dev/null +++ b/Documentation/devicetree/bindings/i2c/i2c-sh_mobile.txt @@ -0,0 +1,26 @@ +Device tree configuration for Renesas IIC (sh_mobile) driver + +Required properties: +- compatible : "renesas,iic-<soctype>". "renesas,rmobile-iic" as fallback +- reg : address start and address range size of device +- interrupts : interrupt of device +- clocks : clock for device +- #address-cells : should be <1> +- #size-cells : should be <0> + +Optional properties: +- clock-frequency : frequency of bus clock in Hz. Default 100kHz if unset. + +Pinctrl properties might be needed, too. See there. + +Example: + + iic0: i2c@e6500000 { + compatible = "renesas,iic-r8a7790", "renesas,rmobile-iic"; + reg = <0 0xe6500000 0 0x425>; + interrupts = <0 174 IRQ_TYPE_LEVEL_HIGH>; + clocks = <&mstp3_clks R8A7790_CLK_IIC0>; + clock-frequency = <400000>; + #address-cells = <1>; + #size-cells = <0>; + }; diff --git a/Documentation/devicetree/bindings/i2c/qcom,i2c-qup.txt b/Documentation/devicetree/bindings/i2c/qcom,i2c-qup.txt new file mode 100644 index 000000000000..dc71754a56af --- /dev/null +++ b/Documentation/devicetree/bindings/i2c/qcom,i2c-qup.txt @@ -0,0 +1,40 @@ +Qualcomm Universal Peripheral (QUP) I2C controller + +Required properties: + - compatible: Should be: + * "qcom,i2c-qup-v1.1.1" for 8660, 8960 and 8064. + * "qcom,i2c-qup-v2.1.1" for 8974 v1. + * "qcom,i2c-qup-v2.2.1" for 8974 v2 and later. + - reg: Should contain QUP register address and length. + - interrupts: Should contain I2C interrupt. + + - clocks: A list of phandles + clock-specifiers, one for each entry in + clock-names. + - clock-names: Should contain: + * "core" for the core clock + * "iface" for the AHB clock + + - #address-cells: Should be <1> Address cells for i2c device address + - #size-cells: Should be <0> as i2c addresses have no size component + +Optional properties: + - clock-frequency: Should specify the desired i2c bus clock frequency in Hz, + defaults to 100kHz if omitted. + +Child nodes should conform to i2c bus binding. + +Example: + + i2c@f9924000 { + compatible = "qcom,i2c-qup-v2.2.1"; + reg = <0xf9924000 0x1000>; + interrupts = <0 96 0>; + + clocks = <&gcc GCC_BLSP1_QUP2_I2C_APPS_CLK>, <&gcc GCC_BLSP1_AHB_CLK>; + clock-names = "core", "iface"; + + clock-frequency = <355000>; + + #address-cells = <1>; + #size-cells = <0>; + }; diff --git a/Documentation/devicetree/bindings/i2c/trivial-devices.txt b/Documentation/devicetree/bindings/i2c/trivial-devices.txt index 1a1ac2e560e9..bef86e57c388 100644 --- a/Documentation/devicetree/bindings/i2c/trivial-devices.txt +++ b/Documentation/devicetree/bindings/i2c/trivial-devices.txt @@ -13,11 +13,26 @@ ad,ad7414 SMBus/I2C Digital Temperature Sensor in 6-Pin SOT with SMBus Alert an ad,adm9240 ADM9240: Complete System Hardware Monitor for uProcessor-Based Systems adi,adt7461 +/-1C TDM Extended Temp Range I.C adt7461 +/-1C TDM Extended Temp Range I.C +adi,adt7473 +/-1C TDM Extended Temp Range I.C +adi,adt7475 +/-1C TDM Extended Temp Range I.C +adi,adt7476 +/-1C TDM Extended Temp Range I.C +adi,adt7490 +/-1C TDM Extended Temp Range I.C at,24c08 i2c serial eeprom (24cxx) +atmel,24c00 i2c serial eeprom (24cxx) +atmel,24c01 i2c serial eeprom (24cxx) atmel,24c02 i2c serial eeprom (24cxx) +atmel,24c04 i2c serial eeprom (24cxx) +atmel,24c16 i2c serial eeprom (24cxx) +atmel,24c32 i2c serial eeprom (24cxx) +atmel,24c64 i2c serial eeprom (24cxx) +atmel,24c128 i2c serial eeprom (24cxx) +atmel,24c256 i2c serial eeprom (24cxx) +atmel,24c512 i2c serial eeprom (24cxx) +atmel,24c1024 i2c serial eeprom (24cxx) atmel,at97sc3204t i2c trusted platform module (TPM) capella,cm32181 CM32181: Ambient Light Sensor catalyst,24c32 i2c serial eeprom +cirrus,cs42l51 Cirrus Logic CS42L51 audio codec dallas,ds1307 64 x 8, Serial, I2C Real-Time Clock dallas,ds1338 I2C RTC with 56-Byte NV RAM dallas,ds1339 I2C Serial Real-Time Clock @@ -45,8 +60,10 @@ maxim,ds1050 5 Bit Programmable, Pulse-Width Modulator maxim,max1237 Low-Power, 4-/12-Channel, 2-Wire Serial, 12-Bit ADCs maxim,max6625 9-Bit/12-Bit Temperature Sensors with I²C-Compatible Serial Interface mc,rv3029c2 Real Time Clock Module with I2C-Bus +national,lm63 Temperature sensor with integrated fan control national,lm75 I2C TEMP SENSOR national,lm80 Serial Interface ACPI-Compatible Microprocessor System Hardware Monitor +national,lm85 Temperature sensor with integrated fan control national,lm92 ±0.33°C Accurate, 12-Bit + Sign Temperature Sensor and Thermal Window Comparator with Two-Wire Interface nuvoton,npct501 i2c trusted platform module (TPM) nxp,pca9556 Octal SMBus and I2C registered interface @@ -58,6 +75,7 @@ plx,pex8648 48-Lane, 12-Port PCI Express Gen 2 (5.0 GT/s) Switch ramtron,24c64 i2c serial eeprom (24cxx) ricoh,rs5c372a I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC samsung,24ad0xd1 S524AD0XF1 (128K/256K-bit Serial EEPROM for Low Power) +sii,s35390a 2-wire CMOS real-time clock st-micro,24c256 i2c serial eeprom (24cxx) stm,m41t00 Serial Access TIMEKEEPER stm,m41t62 Serial real-time clock (RTC) with alarm |