pinctrl: sprd: Fix the kconfig warning

On X86 plaform, if the CONFIG_OF is not selected, and set the
CONFIG_SPRD_SC9860 as 'm', that will cause below waring:

WARNING: unmet direct dependencies detected for PINCTRL_SPRD
Depends on [n]: PINCTRL [=y] && OF [=n] && (ARCH_SPRD || COMPILE_TEST [=y])
Selected by [m]:
- PINCTRL_SPRD_SC9860 [=m] && PINCTRL [=y]

Thus move the configuration dependency under CONFIG_PINCTRL_SPRD_SC9860
to fix the warning.

Reported-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Baolin Wang <baolin.wang7@gmail.com>
Link: https://lore.kernel.org/r/eeb12d7843fb06f80e19f98eb25711231c3b610f.1583205650.git.baolin.wang7@gmail.com
Acked-by: Randy Dunlap <rdunlap@infradead.org> # build-tested
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

pinctrl: sprd: Allow the SPRD pinctrl driver building into a module

Change the config to 'tristate' and export some symbols needed by modules
to allow the Spreadtrum pinctrl driver building into a module.

Signed-off-by: Baolin Wang <baolin.wang7@gmail.com>
Link: https://lore.kernel.org/r/d7239f3c7379e402f665fc8927f635ac56691380.1582776447.git.baolin.wang7@gmail.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

treewide: Add SPDX license identifier - Makefile/Kconfig

Add SPDX license identifiers to all Make/Kconfig files which:

- Have no license information of any form

These files fall under the project license, GPL v2 only. The resulting SPDX
license identifier is:

GPL-2.0-only

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

pinctrl: sprd: Restrict PINCTRL_SPRD to ARCH_SPRD or COMPILE_TEST

The Spreadtrum pinctrl drivers are only useful when building for a
Spreadtrum platform.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

pinctrl: sprd: fix build errors and dependencies

Fix build errors when CONFIG_OF is not enabled.
Also, the pinctrl-sprd-sc9860 driver uses functions from the pinctrl-sprd
driver, so the former should depend on the latter driver.

../drivers/pinctrl/sprd/pinctrl-sprd.c: In function 'sprd_dt_node_to_map':
../drivers/pinctrl/sprd/pinctrl-sprd.c:290:2: error: implicit declaration of function 'pinconf_generic_parse_dt_config' [-Werror=implicit-function-declaration]
ret = pinconf_generic_parse_dt_config(np, pctldev, &configs,
^
../drivers/pinctrl/sprd/pinctrl-sprd.c: At top level:
../drivers/pinctrl/sprd/pinctrl-sprd.c:844:44: error: array type has incomplete element type
static const struct pinconf_generic_params sprd_dt_params[] = {
^
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Baolin Wang <baolin.wang@spreadtrum.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: linux-gpio@vger.kernel.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

pinctrl: sprd: Add Spreadtrum pin control driver

This patch adds the pin control driver for Spreadtrum SC9860 platform.

Signed-off-by: Baolin Wang <baolin.wang@spreadtrum.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>