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charset="us-ascii"; Format="flowed" Sender: "linux-amlogic" Errors-To: linux-amlogic-bounces+linux-amlogic=archiver.kernel.org@lists.infradead.org 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. Here, I'll modify the register description. Do you think it's feasible description: EMMC clock divider control >> >>>> + >>>> + reg-names: >>>> + items: >>>> + - const: core >>>> + - const: pclk >>>> + >>>> + clocks: >>>> + items: >>>> + - description: clock gate >>> >>> Are you sure this is separate clock input to this device? >>> >> >> This clock is used by the APB interface to access the SPIFC registers. > > So APB clock? > Yes. The APB clock serves as the source clock, but each device receives it through an individual clock gating circuit. I will modify the description of this clock description: apb gate > > > Best regards, > Krzysztof _______________________________________________ linux-amlogic mailing list linux-amlogic@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-amlogic