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215e50b086
Interrupt line can be configured on different hardware in different way, even inverted. Therefore driver should not enforce specific trigger type - edge falling - but instead rely on Devicetree to configure it. The Maxim 77686 datasheet describes the interrupt line as active low with a requirement of acknowledge from the CPU therefore the edge falling is not correct. The interrupt line is shared between PMIC and RTC driver, so using level sensitive interrupt is here especially important to avoid races. With an edge configuration in case if first PMIC signals interrupt followed shortly after by the RTC, the interrupt might not be yet cleared/acked thus the second one would not be noticed. Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Lee Jones <lee.jones@linaro.org> Link: https://lore.kernel.org/r/20210602110445.33536-2-krzysztof.kozlowski@canonical.com
114 lines
2.7 KiB
Text
114 lines
2.7 KiB
Text
Binding for Maxim MAX77686/MAX77802/MAX77620 32k clock generator block
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This is a part of device tree bindings of MAX77686/MAX77802/MAX77620
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multi-function device. More information can be found in MFD DT binding
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doc as follows:
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bindings/mfd/max77686.txt for MAX77686 and
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bindings/mfd/max77802.txt for MAX77802 and
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bindings/mfd/max77620.txt for MAX77620.
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The MAX77686 contains three 32.768khz clock outputs that can be controlled
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(gated/ungated) over I2C. Clocks are defined as preprocessor macros in
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dt-bindings/clock/maxim,max77686.h.
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The MAX77802 contains two 32.768khz clock outputs that can be controlled
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(gated/ungated) over I2C. Clocks are defined as preprocessor macros in
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dt-bindings/clock/maxim,max77802.h.
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The MAX77686 contains one 32.768khz clock outputs that can be controlled
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(gated/ungated) over I2C. Clocks are defined as preprocessor macros in
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dt-bindings/clock/maxim,max77620.h.
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Following properties should be presend in main device node of the MFD chip.
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Required properties:
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- #clock-cells: from common clock binding; shall be set to 1.
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Optional properties:
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- clock-output-names: From common clock binding.
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Each clock is assigned an identifier and client nodes can use this identifier
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to specify the clock which they consume. Following indices are allowed:
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- 0: 32khz_ap clock (max77686, max77802), 32khz_out0 (max77620)
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- 1: 32khz_cp clock (max77686, max77802),
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- 2: 32khz_pmic clock (max77686).
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Clocks are defined as preprocessor macros in above dt-binding header for
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respective chips.
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Example:
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1. With MAX77686:
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#include <dt-bindings/clock/maxim,max77686.h>
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/* ... */
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Node of the MFD chip
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max77686: max77686@9 {
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compatible = "maxim,max77686";
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interrupt-parent = <&wakeup_eint>;
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interrupts = <26 IRQ_TYPE_LEVEL_LOW>;
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reg = <0x09>;
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#clock-cells = <1>;
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/* ... */
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};
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Clock consumer node
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foo@0 {
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compatible = "bar,foo";
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/* ... */
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clock-names = "my-clock";
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clocks = <&max77686 MAX77686_CLK_PMIC>;
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};
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2. With MAX77802:
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#include <dt-bindings/clock/maxim,max77802.h>
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/* ... */
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Node of the MFD chip
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max77802: max77802@9 {
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compatible = "maxim,max77802";
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interrupt-parent = <&wakeup_eint>;
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interrupts = <26 IRQ_TYPE_LEVEL_LOW>;
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reg = <0x09>;
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#clock-cells = <1>;
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/* ... */
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};
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Clock consumer node
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foo@0 {
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compatible = "bar,foo";
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/* ... */
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clock-names = "my-clock";
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clocks = <&max77802 MAX77802_CLK_32K_AP>;
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};
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3. With MAX77620:
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#include <dt-bindings/clock/maxim,max77620.h>
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/* ... */
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Node of the MFD chip
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max77620: max77620@3c {
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compatible = "maxim,max77620";
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reg = <0x3c>;
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#clock-cells = <1>;
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/* ... */
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};
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Clock consumer node
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foo@0 {
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compatible = "bar,foo";
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/* ... */
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clock-names = "my-clock";
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clocks = <&max77620 MAX77620_CLK_32K_OUT0>;
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};
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