spi: Convert CONFIG_DM_SPI* to CONFIG_$(SPL_TPL_)DM_SPI*

This change allows more fine tuning of driver model based SPI support in
SPL and TPL. It is now possible to explicitly enable/disable the DM_SPI
support in SPL and TPL via Kconfig option.

Before this change it was necessary to use:
    /* SPI Flash Configs */
    #if defined(CONFIG_SPL_BUILD)
    #undef CONFIG_DM_SPI
    #undef CONFIG_DM_SPI_FLASH
    #undef CONFIG_SPI_FLASH_MTD
    #endif

in the ./include/configs/<board>.h, which is error prone and shall be
avoided when we strive to switch to Kconfig.

The goal of this patch:

Provide distinction for DM_SPI support in both U-Boot proper and SPL (TPL).
Valid use case is when U-Boot proper wants to use DM_SPI, but SPL must
still support non DM driver.

Another use case is the conversion of non DM/DTS SPI driver to support
DM/DTS. When such driver needs to work in both SPL and U-Boot proper, the
distinction is needed in Kconfig (also if SPL version of the driver
supports OF_PLATDATA).

In the end of the day one would have to support following use cases (in
single driver file - e.g. mxs_spi.c):

- U-Boot proper driver supporting DT/DTS
- U-Boot proper driver without DT/DTS support (deprecated)
- SPL driver without DT/DTS support
- SPL (and TPL) driver with DT/DTS (when the SoC has enough resources to
  run full blown DT/DTS)
- SPL driver with DT/DTS and SPL_OF_PLATDATA (when one have constrained
  environment with no fitImage and OF_LIBFDT support).

Some boards do require SPI support (with DM) in SPL (TPL) and some only
have DM_SPI{_FLASH} defined to allow compiling SPL.

This patch converts #ifdef CONFIG_DM_SPI* to #if CONFIG_IS_ENABLED(DM_SPI)
and provides corresponding defines in Kconfig.

Signed-off-by: Lukasz Majewski <lukma@denx.de>
Tested-by: Adam Ford <aford173@gmail.com> #da850-evm
Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
[trini: Fixup a few platforms]
Signed-off-by: Tom Rini <trini@konsulko.com>

drivers/spi/Makefile

@@ -4,7 +4,7 @@
 # Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 
 # There are many options which enable SPI, so make this library available
-ifdef CONFIG_DM_SPI
+ifdef CONFIG_$(SPL_TPL_)DM_SPI
 obj-y += spi-uclass.o
 obj-$(CONFIG_SANDBOX) += spi-emul-uclass.o
 obj-$(CONFIG_SOFT_SPI) += soft_spi.o

drivers/spi/kirkwood_spi.c

@@ -94,7 +94,7 @@ static int _spi_xfer(struct kwspi_registers *reg, unsigned int bitlen,
 	return 0;
 }
 
-#ifndef CONFIG_DM_SPI
+#if !CONFIG_IS_ENABLED(DM_SPI)
 
 static struct kwspi_registers *spireg =
 	(struct kwspi_registers *)MVEBU_SPI_BASE;

drivers/spi/mxc_spi.c

@@ -67,7 +67,7 @@ static inline struct mxc_spi_slave *to_mxc_spi_slave(struct spi_slave *slave)
 
 static void mxc_spi_cs_activate(struct mxc_spi_slave *mxcs)
 {
-#if defined(CONFIG_DM_SPI)
+#if CONFIG_IS_ENABLED(DM_SPI)
 	struct udevice *dev = mxcs->dev;
 	struct dm_spi_slave_platdata *slave_plat = dev_get_parent_platdata(dev);
 
@@ -85,7 +85,7 @@ static void mxc_spi_cs_activate(struct mxc_spi_slave *mxcs)
 
 static void mxc_spi_cs_deactivate(struct mxc_spi_slave *mxcs)
 {
-#if defined(CONFIG_DM_SPI)
+#if CONFIG_IS_ENABLED(DM_SPI)
 	struct udevice *dev = mxcs->dev;
 	struct dm_spi_slave_platdata *slave_plat = dev_get_parent_platdata(dev);
 
@@ -415,7 +415,7 @@ static int mxc_spi_claim_bus_internal(struct mxc_spi_slave *mxcs, int cs)
 	return 0;
 }
 
-#ifndef CONFIG_DM_SPI
+#if !CONFIG_IS_ENABLED(DM_SPI)
 int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
 		void *din, unsigned long flags)
 {

drivers/spi/omap3_spi.c

@@ -109,7 +109,7 @@ struct mcspi {
 };
 
 struct omap3_spi_priv {
-#ifndef CONFIG_DM_SPI
+#if !CONFIG_IS_ENABLED(DM_SPI)
 	struct spi_slave slave;
 #endif
 	struct mcspi *regs;
@@ -455,7 +455,7 @@ static void _omap3_spi_claim_bus(struct omap3_spi_priv *priv)
 	writel(conf, &priv->regs->modulctrl);
 }
 
-#ifndef CONFIG_DM_SPI
+#if !CONFIG_IS_ENABLED(DM_SPI)
 
 static inline struct omap3_spi_priv *to_omap3_spi(struct spi_slave *slave)
 {

drivers/spi/sh_qspi.c

@@ -68,7 +68,7 @@ struct sh_qspi_regs {
 };
 
 struct sh_qspi_slave {
-#ifndef CONFIG_DM_SPI
+#if !CONFIG_IS_ENABLED(DM_SPI)
 	struct spi_slave	slave;
 #endif
 	struct sh_qspi_regs	*regs;
@@ -223,7 +223,7 @@ static int sh_qspi_xfer_common(struct sh_qspi_slave *ss, unsigned int bitlen,
 	return ret;
 }
 
-#ifndef CONFIG_DM_SPI
+#if !CONFIG_IS_ENABLED(DM_SPI)
 static inline struct sh_qspi_slave *to_sh_qspi(struct spi_slave *slave)
 {
 	return container_of(slave, struct sh_qspi_slave, slave);