linux-kernel - Re: [PATCH 4/8] arm64: dts: ti: k3-am625-beagleplay: Add overlays for OV5640

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Message-ID: <hkw7lkbw6wx6pfznnhnwwewsqfljmbam5r7r36o6kqfoomottf@qyq4dwdcswgs>
Date:   Fri, 17 Nov 2023 13:24:58 +0530
From:   Jai Luthra <j-luthra@...com>
To:     Andrew Davis <afd@...com>
CC:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Nishanth Menon <nm@...com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Tero Kristo <kristo@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        Aradhya Bhatia <a-bhatia1@...com>,
        Devarsh Thakkar <devarsht@...com>,
        Vaishnav Achath <vaishnav.a@...com>,
        Julien Massot <julien.massot@...labora.com>,
        Martyn Welch <martyn.welch@...labora.com>
Subject: Re: [PATCH 4/8] arm64: dts: ti: k3-am625-beagleplay: Add overlays
 for OV5640

Hi Andrew,

Thanks for the review.

On Nov 16, 2023 at 08:26:40 -0600, Andrew Davis wrote:
> On 11/15/23 3:51 AM, Jai Luthra wrote:
> > Three different OV5640 modules are supported using the FFC connector on
> > BeaglePlay:
> > - Digilent PCam 5C
> > - ALINX AN5641
> > - TEVI-OV5640-*-RPI
> > 
> > The Digilent and ALINX modules supply a 12Mhz XCLK to the sensor, while
> > the TEVI module supplies a 24Mhz XCLK, thus requiring a separate
> > overlay.
> > 
> > Signed-off-by: Jai Luthra <j-luthra@...com>
> > ---
> >   arch/arm64/boot/dts/ti/Makefile                    |  7 ++
> >   .../dts/ti/k3-am625-beagleplay-csi2-ov5640.dtso    | 77 ++++++++++++++++++++++
> >   .../ti/k3-am625-beagleplay-csi2-tevi-ov5640.dtso   | 77 ++++++++++++++++++++++
> >   3 files changed, 161 insertions(+)
> > 
> > diff --git a/arch/arm64/boot/dts/ti/Makefile b/arch/arm64/boot/dts/ti/Makefile
> > index 77a347f9f47d..e49e32414560 100644
> > --- a/arch/arm64/boot/dts/ti/Makefile
> > +++ b/arch/arm64/boot/dts/ti/Makefile
> > @@ -9,9 +9,15 @@
> >   # alphabetically.
> >   # Boards with AM62x SoC
> > +k3-am625-beagleplay-csi2-ov5640-dtbs := k3-am625-beagleplay.dtb \
> > +	k3-am625-beagleplay-csi2-ov5640.dtbo
> > +k3-am625-beagleplay-csi2-tevi-ov5640-dtbs := k3-am625-beagleplay.dtb \
> > +	k3-am625-beagleplay-csi2-tevi-ov5640.dtbo
> >   k3-am625-sk-hdmi-audio-dtbs := k3-am625-sk.dtb k3-am62x-sk-hdmi-audio.dtbo
> >   k3-am62-lp-sk-hdmi-audio-dtbs := k3-am62-lp-sk.dtb k3-am62x-sk-hdmi-audio.dtbo
> >   dtb-$(CONFIG_ARCH_K3) += k3-am625-beagleplay.dtb
> > +dtb-$(CONFIG_ARCH_K3) += k3-am625-beagleplay-csi2-ov5640.dtb
> > +dtb-$(CONFIG_ARCH_K3) += k3-am625-beagleplay-csi2-tevi-ov5640.dtb
> 
> 
> We don't need .dtb files for each overlay combination, you should leave these
> as overlays only, and just apply them at boot time as needed.
> 
> To test apply them at build time, you can use the CONFIG_OF_ALL_DTBS
> method that Rob suggested here[0].
> 
> # Build time test only, enabled by CONFIG_OF_ALL_DTBS
> dtb- += \
> 	k3-am625-beagleplay-overlay-test1.dtb \
> 	k3-am625-beagleplay-overlay-test2.dtb
> k3-am625-beagleplay-overlay-test1-dtbs := k3-am625-beagleplay.dtb \
> 	k3-am625-beagleplay-csi2-ov5640.dtbo
> k3-am625-beagleplay-overlay-test1-dtbs := k3-am625-beagleplay.dtb \
> 	k3-am625-beagleplay-csi2-tevi-ov5640.dtbo
> 
> dtb-$(CONFIG_ARCH_K3) += k3-am625-beagleplay-csi2-ov5640.dtbo
> dtb-$(CONFIG_ARCH_K3) += k3-am625-beagleplay-csi2-tevi-ov5640.dtbo
> 
> [0] https://lore.kernel.org/all/CAL_Jsq+8jisrwEqzz7tZnsV9g2+LmThwpO7sHRFA-zh+6q8XuA@mail.gmail.com/
> 

Makes sense, I was able to test this out locally by adding:
OF_ALL_DTBS=y
COMPILE_TEST=y
in my config.

Will send a v2 with the above changes.

I think Rob's comment on [0] for testing every combination is valid 
here, so I will apply each camera overlay on each board that it can be 
used with.

> >   dtb-$(CONFIG_ARCH_K3) += k3-am625-phyboard-lyra-rdk.dtb
> >   dtb-$(CONFIG_ARCH_K3) += k3-am625-sk.dtb
> >   dtb-$(CONFIG_ARCH_K3) += k3-am625-verdin-nonwifi-dahlia.dtb
> > @@ -81,6 +87,7 @@ dtb-$(CONFIG_ARCH_K3) += k3-am69-sk.dtb
> >   dtb-$(CONFIG_ARCH_K3) += k3-j784s4-evm.dtb
> >   # Enable support for device-tree overlays
> > +DTC_FLAGS_k3-am625-beagleplay += -@
> 
> Having any DTBO applied to the base during build will add symbols to the
> base for you, no need to add this line.
> (Please check that this is true for the OF_ALL_DTBS case above, I've not
> checked yet, we should fix if not).

Without the explicit "-@" flag, the base dtb is built with symbols 
*only* if we were doing compile test with OF_ALL_DTBS=y.

For the standard build (arm64/configs/defconfig) the base DTB is built 
*without* symbols as make does not see any combined DTBs as targets.
> 
> I plan to remove the same below in later patches so folks will stop adding
> more of these lines.
> 

It is not clear to me how we could avoid explicitly enabling the "-@" 
flag for non-compile-test builds, let me know if you have any ideas.

> Andrew
> 
> >   DTC_FLAGS_k3-am625-sk += -@
> >   DTC_FLAGS_k3-am62-lp-sk += -@
> >   DTC_FLAGS_k3-am6548-iot2050-advanced-m2 += -@

[...]

-- 
Thanks,
Jai

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