[PATCH] i2c: busses: make K1 driver default for SpacemiT platforms

[Iker Pedrosa]

Enable I2C_K1 by default when ARCH_SPACEMIT is configured to ensure SD
card functionality works out-of-the-box.

SpacemiT K1 boards use I2C-controlled PMICs (like the P1 chip) to
provide SD card power supplies. Without the I2C_K1 driver enabled,
regulators cannot be controlled and SD card detection/operation fails.

Suggested-by: Margherita Milani <margherita.milani@xxxxxxxxxxxxxxxxxxxx>
Suggested-by: Yixun Lan <dlan@xxxxxxxxxx>
Signed-off-by: Iker Pedrosa <ikerpedrosam@xxxxxxxxx>
---
This patch addresses a user experience issue where SD card support fails
on SpacemiT K1 boards due to missing I2C driver dependency.

Background:
SpacemiT K1 boards use I2C-controlled PMICs (such as the P1 chip) to
provide SD card power supplies. When CONFIG_MMC_SDHCI_OF_K1 is enabled
but CONFIG_I2C_K1 is disabled, SD card detection and operation fails
because the regulator subsystem cannot communicate with the PMIC over
I2C.

Solution:
Following discussion in the community, this patch implements Yixun Lan's
suggested approach of making CONFIG_I2C_K1 default to enabled when
ARCH_SPACEMIT is configured, rather than adding hard dependencies
between unrelated subsystems.

This ensures SD card functionality works out-of-the-box while
maintaining proper subsystem separation and supporting theoretical
future boards that might use different PMIC interfaces.

Link: https://lore.kernel.org/all/CABdCQ=NFuW-XBK2zrw2TUFrEg0Q1Wf3_qS28zT3v-Hfud8mkew@xxxxxxxxxxxxxx/
---
 drivers/i2c/busses/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index 8c935f867a37..bfe191e50b49 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -794,6 +794,7 @@ config I2C_K1
 	tristate "SpacemiT K1 I2C adapter"
 	depends on ARCH_SPACEMIT || COMPILE_TEST
 	depends on OF
+	default ARCH_SPACEMIT
 	help
 	  This option enables support for the I2C interface on the SpacemiT K1
 	  platform.

---
base-commit: 6edd9a0d32e1ef81133b8cb5b3bb3157a44da4d1
change-id: 20260526-orangepi-sd-card-i2c-f04c89c12998

Best regards,
-- 
Iker Pedrosa <ikerpedrosam@xxxxxxxxx>