Messages in this thread | | | Date | Sun, 29 Oct 2023 22:16:14 +0100 | From | Artur Weber <> | Subject | Re: [PATCH v2] dt-bindings: clock: brcm,kona-ccu: convert to YAML |
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On 28/10/2023 13:30, Stanislav Jakubek wrote: > On Fri, Oct 27, 2023 at 03:47:48PM +0100, Conor Dooley wrote: >> On Tue, Oct 24, 2023 at 06:45:21PM +0200, Stanislav Jakubek wrote: >>> Convert Broadcom Kona family clock controller unit (CCU) bindings >>> to DT schema. >> >> I didn't cross-check the clock-output-names, but this conversion mostly >> looks good to me. >> >>> Changes during conversion: >>> - remove "dmac" from clock-output-names for brcm,bcm11351-master-ccu, >>> it is not used in DT nor the dt-bindings >>> - remove "uartb4" from clock-output-names for brcm,bcm21664-slave-ccu, >>> it is not used in DT nor the dt-bindings >> >> This I'm not sure about - they _were_ documented in the text-form >> dt-binding, even if they weren't used in the dts. If the clock >> controller does actually produce these clocks, removing them doesn't >> make sense to me. > > Hi Conor. Looking at downstream, I was not able to find these clocks, though > I admit that I'm not familiar enough with the downstream mess to be 100% > confident. > > From what I can tell, the BCM21664 arch/arm/mach-hawaii/clock.c (e.g. [1]) > doesn't contain any mention of uartb4, only uartb, uartb2 and uartb3. > And similarly, for the BCM281XX arch/arm/mach-capri/clock_capri.c (e.g. [2]) > I wasn't able to find any mention of dmac, only dmac_mux_apb and dma_axi > (though these two don't seem to be supported on mainline yet).
I've done some digging in the downstream kernel; for the BCM21664, I'm almost certain that the uartb4 clock doesn't exist. Broadcom helpfully left in "RDB" files containing the entire register layout of all of the components; and even in the RDB for the slave clock manager[1] (used by the other uart clocks), there is no uartb4, nor is it mentioned anywhere else in the kernel (judging by a quick grep in the kernel sources).
As for the BCM281XX clocks, there indeed doesn't seem to be an exact "dmac" clock but there is a "dmac" clock gate register[2], which is used for the dma_axi clock, so perhaps that's what this is referring to? Also not 100% certain.
Best regards, Artur
[1] https://github.com/Samsung-KYLEPROXX/android_kernel_samsung_kyleproxx/blob/cm-14.1/arch/arm/mach-hawaii/include/mach/rdb/brcm_rdb_kps_rst_mgr_reg.h [2] https://github.com/surblazer/android_kernel_samsung_galaxys2plus-common/blob/android-7.1/arch/arm/mach-capri/include/mach/rdb/brcm_rdb_kpm_clk_mgr_reg.h#L417-L433
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