gpio: tegra: don't auto-enable for COMPILE_TEST

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 <arnd@arndb.de>
Fixes: 4dd4dd1d2120 ("gpio: tegra: Allow compile test")
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 536112f..d786061 100644 (file)
--- 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"