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[v8,13/13] arm64: defconfig: Enable OF_OVERLAY option

Message ID 9d5b41bf6d1565f0de96c7c1680bd404cba40189.1742418429.git.andrea.porta@suse.com (mailing list archive)
State Not Applicable, archived
Headers show
Series Add support for RaspberryPi RP1 PCI device using a DT overlay | expand

Commit Message

Andrea della Porta March 19, 2025, 9:52 p.m. UTC 
The RP1 driver uses the infrastructure enabled by OF_OVERLAY config
option. Enable that option in defconfig in order to produce a kernel
usable on RaspberryPi5 avoiding to enable it separately.

Signed-off-by: Andrea della Porta <andrea.porta@suse.com>
---
The following metrics should help to decide whether this patch is
acceptable or not. The defconfig kernel with CONFIG_OF_OVERLAY=y
added (wrt to the defconfig one without that set) has:

- same uncompressed kernel image size (due to ELF section alignment I guess)

- ~7Kb bigger Image.gz

- 3 new modules (all related to RP1, i.e.: clk-rp1, pinctrl-rp1 and rp1-pci)

- 27 added symbols, of which 5 exported
 
hoping this is enough to gather a rough idea of the impact.
Please note that OF_OVERLAY has to be defined in a way or another,
otherwise the RP1 driver won't work correctly in case the dtb overlay
embedded into the driver is used.
Another way would be to add a phony target to the arm64 makefile which
just add that config option to the target.
---
 arch/arm64/configs/defconfig | 1 +
 1 file changed, 1 insertion(+)
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Patch

diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig
index cc70793e97ef..ca492fbd2773 100644
--- a/arch/arm64/configs/defconfig
+++ b/arch/arm64/configs/defconfig
@@ -1643,6 +1643,7 @@  CONFIG_FPGA_BRIDGE=m
 CONFIG_ALTERA_FREEZE_BRIDGE=m
 CONFIG_FPGA_REGION=m
 CONFIG_OF_FPGA_REGION=m
+CONFIG_OF_OVERLAY=y
 CONFIG_TEE=y
 CONFIG_OPTEE=y
 CONFIG_MUX_GPIO=m