I stumbled over a build error with COMPILE_TEST and CONFIG_OF
disabled:

drivers/gpio/gpio-tegra.c: In function 'tegra_gpio_probe':
drivers/gpio/gpio-tegra.c:603:9: error: 'struct gpio_chip' has no member named 
'of_node'

The problem is that the newly added GPIO_TEGRA Kconfig symbol
does not have a dependency on CONFIG_OF. However, there is another
problem here as the driver gets enabled unconditionally whenever
COMPILE_TEST is set.

This fixes both problems, by making the symbol user-visible
when COMPILE_TEST is set and default-enabled for ARCH_TEGRA=y.

As a side-effect, it is now possible to compile-test a Tegra
kernel with GPIO support disabled, which is harmless.

Signed-off-by: Arnd Bergmann <[email protected]>
Fixes: 4dd4dd1d2120 ("gpio: tegra: Allow compile test")
---
 drivers/gpio/Kconfig | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 681c2dcd697b..513a3d174706 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -402,9 +402,12 @@ config GPIO_TB10X
        select OF_GPIO
 
 config GPIO_TEGRA
-       bool
-       default y
+       bool "NVIDIA Tegra GPIO support"
+       default ARCH_TEGRA
        depends on ARCH_TEGRA || COMPILE_TEST
+       depends on OF
+       help
+         Say yes here to support GPIO pins on NVIDIA Tegra SoCs.
 
 config GPIO_TS4800
        tristate "TS-4800 DIO blocks and compatibles"
-- 
2.9.0

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