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On 2025/8/17 15:20, Krzysztof Kozlowski wrote: > [ EXTERNAL EMAIL ] > > On 14/08/2025 08:38, Xianwei Zhao wrote: >> Hi Krzysztof, >> Thanks for your reply. >> >> On 2025/8/14 00:19, Krzysztof Kozlowski wrote: >>> [ EXTERNAL EMAIL ] >>> >>> On 13/08/2025 11:34, Xianwei Zhao wrote: >>>> Hi Krzysztof, >>>> Thanks for your reply. >>>> >>>> On 2025/8/13 15:36, Krzysztof Kozlowski wrote: >>>>> [ EXTERNAL EMAIL ] >>>>> >>>>> On 13/08/2025 08:13, Xianwei Zhao wrote: >>>>>>>> +allOf: >>>>>>>> + - $ref: /schemas/spi/spi-controller.yaml# >>>>>>>> + >>>>>>>> +properties: >>>>>>>> + compatible: >>>>>>>> + const: amlogic,a4-spifc >>>>>>>> + >>>>>>>> + reg: >>>>>>>> + items: >>>>>>>> + - description: core registers >>>>>>>> + - description: parent clk control registers >>>>>>> >>>>>>> Why are you poking to parent node or to clock registers? This looks like >>>>>>> mixing up device address spaces. >>>>>>> >>>>>> >>>>>> The SPIFC bus clock multiplexes EMMC modules, so the corresponding >>>>>> frequency division register is also in EMMC module. The SPIFC and the >>>>>> EMMC modules cannot be used simultaneously. >>>>> >>>>> Then obviously you cannot put here EMMC or parent registers. >>>>> >>>>> It looks really like you miss proper hardware representation. >>>>> >>>> >>>> It does seem a bit unusual. However, in our hardware design, EMMC and >>>> SFC modules are integrated, and they share common resources such as the >>>> clock and I/O pins .They are mutually exclusive. >>>> >>> >>> How did you express it in DT? This looks similar to serial engines and >>> such are not implemented independently. >>> >> >> The hardware design provides this clock for both modules — EMMC and >> SPIFC. A control bit (bit 31: Cfg_NAND, where 0 = Port C only, 1 = NAND) >> is used to determine which module uses the clock. >> >> It's not that NAND is using EMMC’s resources; rather, the configuration >> register controlling this selection is located within the EMMC module, >> which makes the setup appear somewhat unusual. > > No, how did you express in DT that they are mutually exclusive? > I will remove this part of the register description. The clock implementation will be placed in the common module. The SFC is only used as a consumer for the clock. >> >> In the device tree (DT), I'll just refer directly to the clock frequency >> division control register. > > This does not solve the exclusive usage... > > > Best regards, > Krzysztof