[PATCH v1] pwm: th1520: Fix 32-bit build with COMPILE_TEST

[FUJITA Tomonori]

From: FUJITA Tomonori <fujita.tomonori at gmail.com>

Fix the following build error on 32-bit ARM with COMPILE_TEST:

  ERROR: modpost: drivers/pwm/pwm_th1520.ko: symbol '__aeabi_uldivmod' undefined!

The driver divides u64 values when it converts between nanoseconds and
clock cycles. On 32-bit ARM, these divisions are compiled to calls to
__aeabi_uldivmod, which the kernel does not provide.

he TH1520 is a 64-bit RISC-V SoC, so the driver is only used on
64-bit kernels. There is no point in compile testing it on 32-bit.
Limit COMPILE_TEST to 64BIT instead of changing the arithmetic to use
the div64 helpers.

Fixes: 3c180003dffb ("pwm: th1520: Fix missing Kconfig dependencies")
Signed-off-by: FUJITA Tomonori <fujita.tomonori at gmail.com>
---
 drivers/pwm/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig
index 729776086879..abecd95b0c3c 100644
--- a/drivers/pwm/Kconfig
+++ b/drivers/pwm/Kconfig
@@ -772,7 +772,7 @@ config PWM_TEGRA
 
 config PWM_TH1520
 	tristate "TH1520 PWM support"
-	depends on ARCH_THEAD || COMPILE_TEST
+	depends on ARCH_THEAD || (COMPILE_TEST && 64BIT)
 	depends on RUST
 	depends on HAS_IOMEM && COMMON_CLK
 	select RUST_PWM_ABSTRACTIONS

base-commit: d266640c6c760c9bc215bf5a3ece122ca488b6f5
-- 
2.43.0