[U-Boot] [PATCH] spl: Introduce SPL_DM_SPI Kconfig define

[Lukasz Majewski]

This define indicates if DM_SPI shall be supported in SPL. This allows
proper operation of DM converted SPI drivers in SPL, which use
#if !CONFIG_IS_ENABLED(DM_SPI) to also support not yet DM/DTS converted
boards.

Signed-off-by: Lukasz Majewski <lukma at denx.de>

---

Applied on top of -master branch:
SHA1: 448f11f7503995746a7b71e5e3b3a831c4651be9

This patch is a first step for converting SPI #defines to Kconfig.
It was a part of "CONFIG_DM_SPI* to CONFIG_$(SPL_TPL_)DM_SPI*" patch:
https://patchwork.ozlabs.org/patch/1158141/

which in spite of not introducing the apparent build breaks, was
responsible for some deltas in SPL and U-Boot proper sizes (some parts of
SPI code was not compiled in). To fix those board/SoC access to real HW is
necessary as well as deep understanding of SPL SPI requirements.

---
 common/spl/Kconfig | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/common/spl/Kconfig b/common/spl/Kconfig
index 7c3391cabe..183ecf6264 100644
--- a/common/spl/Kconfig
+++ b/common/spl/Kconfig
@@ -683,6 +683,13 @@ config SPL_UBI
 	  Enable support for loading payloads from UBI. See
 	  README.ubispl for more info.
 
+if SPL_DM
+config SPL_DM_SPI
+	bool "Support SPI DM drivers in SPL"
+	help
+	  Enable support for SPI DM drivers in SPL.
+
+endif
 if SPL_UBI
 config SPL_UBI_LOAD_BY_VOLNAME
 	bool "Support loading volumes by name"
-- 
2.11.0