Re: [PATCH] tty: serial: bcm63xx: allow building on ARM64

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On 25.11.2020 09:23, Greg Kroah-Hartman wrote:
On Wed, Nov 25, 2020 at 09:13:52AM +0100, Rafał Miłecki wrote:
From: Rafał Miłecki <rafal@xxxxxxxxxx>

Hardware supported by bcm63xx is also used by BCM4908 SoCs family that
is ARM64.

Signed-off-by: Rafał Miłecki <rafal@xxxxxxxxxx>
---
  drivers/tty/serial/Kconfig | 3 ++-
  1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index 28f22e58639c..6907c5b17a0e 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -1133,7 +1133,8 @@ config SERIAL_TIMBERDALE
  config SERIAL_BCM63XX
  	tristate "Broadcom BCM63xx/BCM33xx UART support"
  	select SERIAL_CORE
-	depends on MIPS || ARM || COMPILE_TEST
+	depends on MIPS || ARM || ARM64 || COMPILE_TEST

Why do we have an arch dependancy at all now?

From my experience "depends" is often used to limit symbol visibility to
applicable platforms only. I don't think Broadcom has any x86, risc, etc.
platforms so it's useless there.

As for testing driver compilation on unused arch-s I thought that's what
COMPILE_TEST is for.

Am I wrong there? I'm afraid we don't have clear Documentation on that.
Please kindly point me to some info if I'm wrong.


+	default ARCH_BCM4908

Really?  I thought we were getting rid of these "ARCH_platform_type" of
things.  That's what a defconfig file is for, right?

I had to miss something, last time I checked Linus called defconfigs a
garbage and wanted to get rid of them:
https://lwn.net/Articles/391372/

There are also no platform defconfigs in arch/arm64/ at all. Should I
handle it with arch/arm64/Kconfig.platforms and "select SERIAL_BCM63XX"?



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