On 06/08/2021 14:07, Sam Protsenko wrote: > On Fri, 6 Aug 2021 at 10:49, Krzysztof Kozlowski > <krzysztof.kozlowski@xxxxxxxxxxxxx> wrote: >> >> On 06/08/2021 01:06, Sam Protsenko wrote: >>> On Sat, 31 Jul 2021 at 12:03, Krzysztof Kozlowski >>> <krzysztof.kozlowski@xxxxxxxxxxxxx> wrote: >>> >>>>> >>>>> This patch adds minimal SoC support. Particular board device tree files >>>>> can include exynos850.dtsi file to get SoC related nodes, and then >>>>> reference those nodes further as needed. >>>>> >>>>> Signed-off-by: Sam Protsenko <semen.protsenko@xxxxxxxxxx> >>>>> --- >>>>> .../boot/dts/exynos/exynos850-pinctrl.dtsi | 782 ++++++++++++++++++ >>>>> arch/arm64/boot/dts/exynos/exynos850-usi.dtsi | 30 + >>>>> arch/arm64/boot/dts/exynos/exynos850.dtsi | 245 ++++++ >>>> >>>> Not buildable. Missing Makefile, missing DTS. Please submit with initial >>>> DTS, otherwise no one is able to verify it even compiles. >>>> >>> >>> This device is not available for purchase yet. I'll send the patch for >>> board dts once it's announced. I can do all the testing for now, if >>> you have any specific requests. Would it be possible for us to review >>> and apply only SoC support for now? Will send v2 soon... >> >> What you propose is equal to adding a driver (C source code) without >> ability to compile it. What's the point of having it in the kernel? It's >> unverifiable, unbuildable and unusable. >> > > Yes, I understand. That's adding code with no users, and it's not a > good practice. > >> We can review the DTSI however merging has to be with a DTS. Usually the >> SoC vendor adds first an evalkit (e.g. SMDK board). Maybe you have one >> for Exynos850? Otherwise if you cannot disclose the actual board, the >> DTSI will have to wait. You can submit drivers, though. >> > > Sure, let's go this way. I'll send v2 soon. Improving patches and > having Reviewed-by tag for those would good enough for me at this > point. I'll continue to prepare another Exynos850 related patches > until the actual board is announced, like proper clock driver, reset, > MMC, etc. Is it ok if I send those for a review too (so I can fix all > issues ahead)? Sure, prepare all necessary drivers earlier. I suspect clocks will be a real pain because of significant changes modeled in vendor kernel. I remember Paweł Chmiel (+Cc) was doing something for these: https://github.com/PabloPL/linux/tree/exynos7420 I mentioned before - you should also modify the chipid driver. Check also other drivers in drivers/soc/samsung, although some are needed only for suspend&resume. BTW, Paweł, How is your Exynos7420 progress? :) > And should I maybe add RFC tag for those? No need. Drivers can be merged before DTS users. Best regards, Krzysztof
