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dt-bindings: nvmem: Add STM32 factory-programmed romem 

Add documentation for STMicroelectronics STM32 Factory-programmed
read only memory area.

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Fabrice Gasnier 2019-04-13 11:32:54 +01:00 committed by Greg Kroah-Hartman
parent da75b89097
commit 4f4cb173d8
1 changed files with 31 additions and 0 deletions
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31
Documentation/devicetree/bindings/nvmem/st,stm32-romem.txt Normal file
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STMicroelectronics STM32 Factory-programmed data device tree bindings
This represents STM32 Factory-programmed read only non-volatile area: locked
flash, OTP, read-only HW regs... This contains various information such as:
analog calibration data for temperature sensor (e.g. TS_CAL1, TS_CAL2),
internal vref (VREFIN_CAL), unique device ID...
Required properties:
- compatible: Should be one of:
"st,stm32f4-otp"
"st,stm32mp15-bsec"
- reg: Offset and length of factory-programmed area.
- #address-cells: Should be '<1>'.
- #size-cells: Should be '<1>'.
Optional Data cells:
- Must be child nodes as described in nvmem.txt.
Example on stm32f4:
romem: nvmem@1fff7800 {
compatible = "st,stm32f4-otp";
reg = <0x1fff7800 0x400>;
#address-cells = <1>;
#size-cells = <1>;
/* Data cells: ts_cal1 at 0x1fff7a2c */
ts_cal1: calib@22c {
reg = <0x22c 0x2>;
};
...
};