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IDT 89HPESx PCIe-switches exposes SMBus interface to have an access to the device CSRs and EEPROM. So to properly utilize the interface functionality, developer should declare a valid dts-file node, which would refer to the corresponding 89HPESx device. Signed-off-by: Serge Semin <fancer.lancer@gmail.com> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
44 lines
1.6 KiB
Text
44 lines
1.6 KiB
Text
EEPROM / CSR SMBus-slave interface of IDT 89HPESx devices
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Required properties:
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- compatible : should be "<manufacturer>,<type>"
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Basically there is only one manufacturer: idt, but some
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compatible devices may be produced in future. Following devices
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are supported: 89hpes8nt2, 89hpes12nt3, 89hpes24nt6ag2,
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89hpes32nt8ag2, 89hpes32nt8bg2, 89hpes12nt12g2, 89hpes16nt16g2,
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89hpes24nt24g2, 89hpes32nt24ag2, 89hpes32nt24bg2;
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89hpes12n3, 89hpes12n3a, 89hpes24n3, 89hpes24n3a;
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89hpes32h8, 89hpes32h8g2, 89hpes48h12, 89hpes48h12g2,
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89hpes48h12ag2, 89hpes16h16, 89hpes22h16, 89hpes22h16g2,
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89hpes34h16, 89hpes34h16g2, 89hpes64h16, 89hpes64h16g2,
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89hpes64h16ag2;
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89hpes12t3g2, 89hpes24t3g2, 89hpes16t4, 89hpes4t4g2,
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89hpes10t4g2, 89hpes16t4g2, 89hpes16t4ag2, 89hpes5t5,
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89hpes6t5, 89hpes8t5, 89hpes8t5a, 89hpes24t6, 89hpes6t6g2,
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89hpes24t6g2, 89hpes16t7, 89hpes32t8, 89hpes32t8g2,
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89hpes48t12, 89hpes48t12g2.
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- reg : I2C address of the IDT 89HPESx device.
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Optionally there can be EEPROM-compatible subnode:
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- compatible: There are five EEPROM devices supported: 24c32, 24c64, 24c128,
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24c256 and 24c512 differed by size.
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- reg: Custom address of EEPROM device (If not specified IDT 89HPESx
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(optional) device will try to communicate with EEPROM sited by default
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address - 0x50)
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- read-only : Parameterless property disables writes to the EEPROM
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(optional)
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Example:
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idt@60 {
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compatible = "idt,89hpes32nt8ag2";
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reg = <0x74>;
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#address-cells = <1>;
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#size-cells = <0>;
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eeprom@50 {
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compatible = "onsemi,24c64";
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reg = <0x50>;
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read-only;
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};
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};
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