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1 | | -Battery Characteristics |
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| 1 | +The contents of this file has been moved to battery.yaml |
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2 | 2 | |
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3 | | -The devicetree battery node provides static battery characteristics. |
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4 | | -In smart batteries, these are typically stored in non-volatile memory |
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5 | | -on a fuel gauge chip. The battery node should be used where there is |
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6 | | -no appropriate non-volatile memory, or it is unprogrammed/incorrect. |
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7 | | - |
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8 | | -Upstream dts files should not include battery nodes, unless the battery |
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9 | | -represented cannot easily be replaced in the system by one of a |
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10 | | -different type. This prevents unpredictable, potentially harmful, |
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11 | | -behavior should a replacement that changes the battery type occur |
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12 | | -without a corresponding update to the dtb. |
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13 | | - |
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14 | | -Required Properties: |
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15 | | - - compatible: Must be "simple-battery" |
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16 | | - |
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17 | | -Optional Properties: |
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18 | | - - voltage-min-design-microvolt: drained battery voltage |
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19 | | - - energy-full-design-microwatt-hours: battery design energy |
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20 | | - - charge-full-design-microamp-hours: battery design capacity |
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21 | | - - precharge-current-microamp: current for pre-charge phase |
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22 | | - - charge-term-current-microamp: current for charge termination phase |
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23 | | - - constant-charge-current-max-microamp: maximum constant input current |
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24 | | - - constant-charge-voltage-max-microvolt: maximum constant input voltage |
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25 | | - |
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26 | | -Battery properties are named, where possible, for the corresponding |
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27 | | -elements in enum power_supply_property, defined in |
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28 | | -https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/include/linux/power_supply.h |
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29 | | - |
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30 | | -Batteries must be referenced by chargers and/or fuel-gauges |
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31 | | -using a phandle. The phandle's property should be named |
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32 | | -"monitored-battery". |
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33 | | - |
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34 | | -Example: |
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35 | | - |
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36 | | - bat: battery { |
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37 | | - compatible = "simple-battery"; |
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38 | | - voltage-min-design-microvolt = <3200000>; |
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39 | | - energy-full-design-microwatt-hours = <5290000>; |
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40 | | - charge-full-design-microamp-hours = <1430000>; |
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41 | | - precharge-current-microamp = <256000>; |
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42 | | - charge-term-current-microamp = <128000>; |
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43 | | - constant-charge-current-max-microamp = <900000>; |
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44 | | - constant-charge-voltage-max-microvolt = <4200000>; |
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45 | | - }; |
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46 | | - |
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47 | | - charger: charger@11 { |
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48 | | - .... |
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49 | | - monitored-battery = <&bat>; |
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50 | | - ... |
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51 | | - }; |
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52 | | - |
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53 | | - fuel_gauge: fuel-gauge@22 { |
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54 | | - .... |
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55 | | - monitored-battery = <&bat>; |
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56 | | - ... |
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57 | | - }; |
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| 3 | +Please note that not all charger drivers respect all of the properties. |
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