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1 | | -= NVMEM(Non Volatile Memory) Data Device Tree Bindings = |
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2 | | - |
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3 | | -This binding is intended to represent the location of hardware |
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4 | | -configuration data stored in NVMEMs like eeprom, efuses and so on. |
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5 | | - |
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6 | | -On a significant proportion of boards, the manufacturer has stored |
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7 | | -some data on NVMEM, for the OS to be able to retrieve these information |
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8 | | -and act upon it. Obviously, the OS has to know about where to retrieve |
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9 | | -these data from, and where they are stored on the storage device. |
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10 | | - |
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11 | | -This document is here to document this. |
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12 | | - |
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13 | | -= Data providers = |
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14 | | -Contains bindings specific to provider drivers and data cells as children |
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15 | | -of this node. |
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16 | | - |
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17 | | -Optional properties: |
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18 | | - read-only: Mark the provider as read only. |
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19 | | - |
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20 | | -= Data cells = |
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21 | | -These are the child nodes of the provider which contain data cell |
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22 | | -information like offset and size in nvmem provider. |
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23 | | - |
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24 | | -Required properties: |
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25 | | -reg: specifies the offset in byte within the storage device. |
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26 | | - |
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27 | | -Optional properties: |
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28 | | - |
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29 | | -bits: Is pair of bit location and number of bits, which specifies offset |
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30 | | - in bit and number of bits within the address range specified by reg property. |
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31 | | - Offset takes values from 0-7. |
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32 | | - |
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33 | | -For example: |
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34 | | - |
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35 | | - /* Provider */ |
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36 | | - qfprom: qfprom@700000 { |
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37 | | - ... |
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38 | | - |
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39 | | - /* Data cells */ |
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40 | | - tsens_calibration: calib@404 { |
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41 | | - reg = <0x404 0x10>; |
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42 | | - }; |
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43 | | - |
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44 | | - tsens_calibration_bckp: calib_bckp@504 { |
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45 | | - reg = <0x504 0x11>; |
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46 | | - bits = <6 128> |
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47 | | - }; |
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48 | | - |
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49 | | - pvs_version: pvs-version@6 { |
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50 | | - reg = <0x6 0x2> |
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51 | | - bits = <7 2> |
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52 | | - }; |
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53 | | - |
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54 | | - speed_bin: speed-bin@c{ |
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55 | | - reg = <0xc 0x1>; |
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56 | | - bits = <2 3>; |
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57 | | - |
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58 | | - }; |
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59 | | - ... |
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60 | | - }; |
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61 | | - |
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62 | | -= Data consumers = |
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63 | | -Are device nodes which consume nvmem data cells/providers. |
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64 | | - |
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65 | | -Required-properties: |
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66 | | -nvmem-cells: list of phandle to the nvmem data cells. |
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67 | | -nvmem-cell-names: names for the each nvmem-cells specified. Required if |
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68 | | - nvmem-cells is used. |
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69 | | - |
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70 | | -Optional-properties: |
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71 | | -nvmem : list of phandles to nvmem providers. |
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72 | | -nvmem-names: names for the each nvmem provider. required if nvmem is used. |
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73 | | - |
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74 | | -For example: |
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75 | | - |
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76 | | - tsens { |
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77 | | - ... |
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78 | | - nvmem-cells = <&tsens_calibration>; |
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79 | | - nvmem-cell-names = "calibration"; |
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80 | | - }; |
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| 1 | +This file has been moved to nvmem.yaml and nvmem-consumer.yaml. |
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