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With a nxp,se97 chip on an atmel sama5d31 board, the I2C adapter driver is not always capable of avoiding the 25-35 ms timeout as specified by the SMBUS protocol. This may cause silent corruption of the last bit of any transfer, e.g. a one is read instead of a zero if the sensor chip times out. This also affects the eeprom half of the nxp-se97 chip, where this silent corruption was originally noticed. Other I2C adapters probably suffer similar issues, e.g. bit-banging comes to mind as risky... The SMBUS register in the nxp chip is not a standard Jedec register, but it is not special to the nxp chips either, at least the atmel chips have the same mechanism. Therefore, do not special case this on the manufacturer, it is opt-in via the device property anyway. Cc: stable@vger.kernel.org # 4.9+ Signed-off-by: Peter Rosin <peda@axentia.se> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
47 lines
984 B
Plaintext
47 lines
984 B
Plaintext
Properties for Jedec JC-42.4 compatible temperature sensors
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Required properties:
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- compatible: May include a device-specific string consisting of the
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manufacturer and the name of the chip. A list of supported
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chip names follows.
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Must include "jedec,jc-42.4-temp" for any Jedec JC-42.4
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compatible temperature sensor.
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Supported chip names:
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adi,adt7408
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atmel,at30ts00
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atmel,at30tse004
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onnn,cat6095
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onnn,cat34ts02
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maxim,max6604
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microchip,mcp9804
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microchip,mcp9805
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microchip,mcp9808
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microchip,mcp98243
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microchip,mcp98244
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microchip,mcp9843
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nxp,se97
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nxp,se98
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st,stts2002
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st,stts2004
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st,stts3000
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st,stts424
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st,stts424e
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idt,tse2002
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idt,tse2004
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idt,ts3000
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idt,ts3001
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- reg: I2C address
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Optional properties:
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- smbus-timeout-disable: When set, the smbus timeout function will be disabled.
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This is not supported on all chips.
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Example:
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temp-sensor@1a {
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compatible = "jedec,jc-42.4-temp";
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reg = <0x1a>;
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};
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