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Date: Wed, 27 Jan 2016 10:42:31 +0100 From: Linus Walleij <linus.walleij@...aro.org> To: Laxman Dewangan <ldewangan@...dia.com>, Sebastian Reichel <sre@...nel.org>, Dmitry Eremin-Solenikov <dbaryshkov@...il.com>, David Woodhouse <dwmw2@...radead.org> Cc: Rob Herring <robh+dt@...nel.org>, Paweł Moll <pawel.moll@....com>, Mark Rutland <mark.rutland@....com>, "ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>, Kumar Gala <galak@...eaurora.org>, Alexandre Courbot <gnurou@...il.com>, Lee Jones <lee.jones@...aro.org>, Mark Brown <broonie@...nel.org>, Alessandro Zummo <a.zummo@...ertech.it>, Alexandre Belloni <alexandre.belloni@...e-electrons.com>, Liam Girdwood <lgirdwood@...il.com>, "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>, "rtc-linux@...glegroups.com" <rtc-linux@...glegroups.com>, Stephen Warren <swarren@...dia.com>, Thierry Reding <treding@...dia.com>, Krzysztof Kozłowski <k.kozlowski@...sung.com>, Ulf Hansson <ulf.hansson@...aro.org> Subject: Re: [PATCH V3 1/5] DT: mfd: add device-tree binding doc fro PMIC max77620/max20024 On Thu, Jan 14, 2016 at 12:32 PM, Laxman Dewangan <ldewangan@...dia.com> wrote: > +Flexible power sequence configuration > +==================================== > +This sub-node configures the Flexible Power Sequnece(FPS) for power ON slot, > +power OFF slot and slot period of the device. Device has 3 FPS as FPS0, > +FPS1 and FPS2. The details of FPS configuration is provided through > +subnode "fps". The details of FPS0, FPS1, FPS2 are provided through the > +child node under this subnodes. The FPS number is provided via reg property. > + > +The property for fps child nodes as: > +Required properties: > + -reg: FPS number like 0, 1, 2 for FPS0, FPS1 and FPS2 respectively. This is ambitiously custom. Isn't power sequencing a generic problem? The MMC subsystem has some power sequencing for example. > +Optinal properties: > + -maxim,active-fps-time-period-us: Active state FPS time period in > + microseconds. > + -maxim,suspend-fps-time-period-us: Suspend state FPS time period in > + microseconds. Define the "active state" and "suspend state" in the initial paragraph under FPS so we can understand what these things are. > + -maxim,fps-enable-input: FPS enable source like EN0, EN1 or SW. The > + macros are defined on dt-bindings/mfd/max77620.h for > + different enable source. > + FPS_EN_SRC_EN0 for EN0 enable source. > + FPS_EN_SRC_EN1 for En1 enable source. > + FPS_EN_SRC_SW for SW based control. Is SW software? And EN0 and EN1 two different lines into the PMIC? In that case describe that somewhere. > + -maxim,fps-sw-enable: Boolean, applicable if enable input is SW. > + If this property present then enable the FPS else > + disable FPS. > + -maxim,enable-sleep: Boolean, enable sleep when the external control > + goes from HIGH to LOW. > + -maxim,enable-global-lpm: Boolean, enable global LPM when the external > + control goes from HIGH to LOW. First *what* is it that will sleep? The PMIC? The whole system? Or does this simply mean that this will start the state machine? Elaborate. This is confusing since for example there is a generic "wakeup-enable;" property you can set on any device, therfore these things must be very precisely defined. What is "external control"? Is that a line into the PMIC? > + Optional properties: > + -------------------- > + Following properties are require if pin control setting is required > + at boot. > + - pinctrl-names: A pinctrl state named "default" be defined, using > + the bindings in pinctrl/pinctrl-binding.txt. > + - pinctrl[0...n]: Properties to contain the phandle that refer to > + different nodes of pin control settings. These nodes > + represents the pin control setting of state 0 to state n. > + Each of these nodes contains different subnodes to > + represents some desired configuration for a list of pins. > + This configuration can include the mux function to select > + on those pin(s), and various pin configuration parameters, > + such as pull-up, open drain. > + > + Each subnode have following properties: > + Required properties: > + - pins: List of pins. Valid values of pins properties > + are: gpio0, gpio1, gpio2, gpio3, gpio4, > + gpio5, gpio6, gpio7 > + > + Optional properties: Optional properties under optional properties? This is getting confusing. Write "Optional pin configurations" > + function, drive-push-pull, drive-open-drain, > + bias-pull-up, bias-pull-down. > + Definitions are in the pinmux dt binding > + devicetree/bindings/pinctrl/pinctrl-bindings.txt > + Absence of properties will leave the configuration > + on default. Thanks for using standardized bindings. > + Valid values for function properties are: > + gpio, lpm-control-in, fps-out, 32k-out, > + sd0-dvs-in, sd1-dvs-in, reference-out > + Theres is also customised property for the GPIO1, > + GPIO2 and GPIO3. > + - maxim,active-fps-source: FPS source for the gpios in > + active state of the GPIO. Valid values are > + FPS_SRC_0, FPS_SRC_1, FPS_SRC_2 and > + FPS_SRC_NONE. Absence of this property will > + leave the pin on default. Define closer what an FPS source is. What is the effect on the pin? > + - maxim,active-fps-power-up-slot: Power up slot on > + given FPS for acive state.Valid values are 0 > + to 7. > + - maxim,active-fps-power-down-slot: Power down slot > + on given FPS for active state. Valid values > + are 0 t 7. > + - maxim,suspend-fps-source: Suspend state FPS source. > + - maxim,suspend-fps-power-down-slot: Suspend state > + power down slot. > + - maxim,suspend-fps-power-up-slot: Suspend state power > + up slot. These two also have to be explained and connected back under the FPS heading and explained. I guess it is impossible to understand this without an accurate understanding of the FPS state machine, so provide such a description in the document. > +Low-Battery Monitor: > +================== > +This sub-node configure low battery monitor configuration registers. > +Device has support for low-battery monitor configuration through > +child DT node "low-battery-monitor". > + > +Optinal properties: > + - maxim,low-battery-dac: Tristate, enable/disable low battery DAC. > + 0 for disable, > + 1 for enable, > + absence will left configuration to default. > + - maxim,low-battery-shutdown: Tristate, enable/disable low battery > + shutdown. > + 0 for disable, > + 1 for enable, > + absence will left configuration to default. > + - maxim,low-battery-reset: Tristate, enable/disable low battery reset. > + 0 for disable, > + 1 for enable, > + absence will left configuration to default. I guess this should be reviewed by the drivers/power maintainers? Added on the To: line. Yours, Linus Walleij
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