diff options
Diffstat (limited to 'dts/Bindings/power')
| -rw-r--r-- | dts/Bindings/power/ltc2941.txt | 27 | ||||
| -rw-r--r-- | dts/Bindings/power/renesas,sysc-rmobile.txt | 99 | ||||
| -rw-r--r-- | dts/Bindings/power/reset/ltc2952-poweroff.txt | 13 | ||||
| -rw-r--r-- | dts/Bindings/power/rockchip-io-domain.txt | 2 |
4 files changed, 135 insertions, 6 deletions
diff --git a/dts/Bindings/power/ltc2941.txt b/dts/Bindings/power/ltc2941.txt new file mode 100644 index 0000000000..ea42ae12d9 --- /dev/null +++ b/dts/Bindings/power/ltc2941.txt @@ -0,0 +1,27 @@ +binding for LTC2941 and LTC2943 battery gauges + +Both the LTC2941 and LTC2943 measure battery capacity. +The LTC2943 is compatible with the LTC2941, it adds voltage and +temperature monitoring, and uses a slightly different conversion +formula for the charge counter. + +Required properties: +- compatible: Should contain "ltc2941" or "ltc2943" which also indicates the + type of I2C chip attached. +- reg: The 7-bit I2C address. +- lltc,resistor-sense: The sense resistor value in milli-ohms. Can be a 32-bit + negative value when the battery has been connected to the wrong end of the + resistor. +- lltc,prescaler-exponent: The prescaler exponent as explained in the datasheet. + This determines the range and accuracy of the gauge. The value is programmed + into the chip only if it differs from the current setting. The setting is + lost when the battery is disconnected. + +Example from the Topic Miami Florida board: + + fuelgauge: ltc2943@64 { + compatible = "ltc2943"; + reg = <0x64>; + lltc,resistor-sense = <15>; + lltc,prescaler-exponent = <5>; /* 2^(2*5) = 1024 */ + }; diff --git a/dts/Bindings/power/renesas,sysc-rmobile.txt b/dts/Bindings/power/renesas,sysc-rmobile.txt new file mode 100644 index 0000000000..cc3b1f0a9b --- /dev/null +++ b/dts/Bindings/power/renesas,sysc-rmobile.txt @@ -0,0 +1,99 @@ +DT bindings for the Renesas R-Mobile System Controller + +== System Controller Node == + +The R-Mobile System Controller provides the following functions: + - Boot mode management, + - Reset generation, + - Power management. + +Required properties: +- compatible: Should be "renesas,sysc-<soctype>", "renesas,sysc-rmobile" as + fallback. + Examples with soctypes are: + - "renesas,sysc-r8a7740" (R-Mobile A1) + - "renesas,sysc-sh73a0" (SH-Mobile AG5) +- reg: Two address start and address range blocks for the device: + - The first block refers to the normally accessible registers, + - the second block refers to the registers protected by the HPB + semaphore. + +Optional nodes: +- pm-domains: This node contains a hierarchy of PM domain nodes, which should + match the Power Area Hierarchy in the Power Domain Specifications section of + the device's datasheet. + + +== PM Domain Nodes == + +Each of the PM domain nodes represents a PM domain, as documented by the +generic PM domain bindings in +Documentation/devicetree/bindings/power/power_domain.txt. + +The nodes should be named by the real power area names, and thus their names +should be unique. + +Required properties: + - #power-domain-cells: Must be 0. + +Optional properties: +- reg: If the PM domain is not always-on, this property must contain the bit + index number for the corresponding power area in the various Power + Control and Status Registers. The parent's node must contain the + following two properties: + - #address-cells: Must be 1, + - #size-cells: Must be 0. + If the PM domain is always-on, this property must be omitted. + + +Example: + +This shows a subset of the r8a7740 PM domain hierarchy, containing the +C5 "always-on" domain, 2 of its subdomains (A4S and A4SU), and the A3SP domain, +which is a subdomain of A4S. + + sysc: system-controller@e6180000 { + compatible = "renesas,sysc-r8a7740", "renesas,sysc-rmobile"; + reg = <0xe6180000 0x8000>, <0xe6188000 0x8000>; + + pm-domains { + pd_c5: c5 { + #address-cells = <1>; + #size-cells = <0>; + #power-domain-cells = <0>; + + pd_a4s: a4s@10 { + reg = <10>; + #address-cells = <1>; + #size-cells = <0>; + #power-domain-cells = <0>; + + pd_a3sp: a3sp@11 { + reg = <11>; + #power-domain-cells = <0>; + }; + }; + + pd_a4su: a4su@20 { + reg = <20>; + #power-domain-cells = <0>; + }; + }; + }; + }; + + +== PM Domain Consumers == + +Hardware blocks belonging to a PM domain should contain a "power-domains" +property that is a phandle pointing to the corresponding PM domain node. + +Example: + + tpu: pwm@e6600000 { + compatible = "renesas,tpu-r8a7740", "renesas,tpu"; + reg = <0xe6600000 0x100>; + clocks = <&mstp3_clks R8A7740_CLK_TPU0>; + power-domains = <&pd_a3sp>; + #pwm-cells = <3>; + }; diff --git a/dts/Bindings/power/reset/ltc2952-poweroff.txt b/dts/Bindings/power/reset/ltc2952-poweroff.txt index 0c94c637f6..cd2d7f58a9 100644 --- a/dts/Bindings/power/reset/ltc2952-poweroff.txt +++ b/dts/Bindings/power/reset/ltc2952-poweroff.txt @@ -1,20 +1,23 @@ Binding for the LTC2952 PowerPath controller This chip is used to externally trigger a system shut down. Once the trigger has -been sent, the chips' watchdog has to be reset to gracefully shut down. -If the Linux systems decides to shut down it powers off the platform via the -kill signal. +been sent, the chip's watchdog has to be reset to gracefully shut down. +A full powerdown can be triggered via the kill signal. Required properties: - compatible: Must contain: "lltc,ltc2952" -- trigger-gpios: phandle + gpio-specifier for the GPIO connected to the - chip's trigger line - watchdog-gpios: phandle + gpio-specifier for the GPIO connected to the chip's watchdog line - kill-gpios: phandle + gpio-specifier for the GPIO connected to the chip's kill line +Optional properties: +- trigger-gpios: phandle + gpio-specifier for the GPIO connected to the + chip's trigger line. If this property is not set, the + trigger function is ignored and the chip is kept alive + until an explicit kill signal is received + Example: ltc2952 { diff --git a/dts/Bindings/power/rockchip-io-domain.txt b/dts/Bindings/power/rockchip-io-domain.txt index 6fbf6e7ecd..8b70db103c 100644 --- a/dts/Bindings/power/rockchip-io-domain.txt +++ b/dts/Bindings/power/rockchip-io-domain.txt @@ -37,7 +37,7 @@ Required properties: You specify supplies using the standard regulator bindings by including -a phandle the the relevant regulator. All specified supplies must be able +a phandle the relevant regulator. All specified supplies must be able to report their voltage. The IO Voltage Domain for any non-specified supplies will be not be touched. |