Document and enable the linux_spi driver

The linux_spi driver is now enabled by default on Linux.
A man page entry and a line in --list-supported output have been added.

Corresponding to flashrom svn r1498.

Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>

Makefile

@@ -209,6 +209,14 @@ override CONFIG_FT2232_SPI = no
 endif
 endif
 
+ifneq ($(TARGET_OS), Linux)
+ifeq ($(CONFIG_LINUX_SPI), yes)
+UNSUPPORTED_FEATURES += CONFIG_LINUX_SPI=yes
+else
+override CONFIG_LINUX_SPI = no
+endif
+endif
+
 # Determine the destination processor architecture.
 # IMPORTANT: The following line must be placed before ARCH is ever used
 # (of course), but should come after any lines setting CC because the line
@@ -324,16 +332,15 @@ CONFIG_OGP_SPI ?= yes
 # Always enable Bus Pirate SPI for now.
 CONFIG_BUSPIRATE_SPI ?= yes
 
-# Disable Linux spidev interface support for now, until we check for a Linux
-# device (not host, as DOS binaries for example are built on a Linux host).
-CONFIG_LINUX_SPI ?= no
-
 # Disable Dediprog SF100 until support is complete and tested.
 CONFIG_DEDIPROG ?= no
 
 # Always enable Marvell SATA controllers for now.
 CONFIG_SATAMV ?= yes
 
+# Enable Linux spidev interface by default. We disable it on non-Linux targets.
+CONFIG_LINUX_SPI ?= yes
+
 # Disable wiki printing by default. It is only useful if you have wiki access.
 CONFIG_PRINT_WIKI ?= no
 
@@ -465,11 +472,6 @@ PROGRAMMER_OBJS += buspirate_spi.o
 NEED_SERIAL := yes
 endif
 
-ifeq ($(CONFIG_LINUX_SPI), yes)
-FEATURE_CFLAGS += -D'CONFIG_LINUX_SPI=1'
-PROGRAMMER_OBJS += linux_spi.o
-endif
-
 ifeq ($(CONFIG_DEDIPROG), yes)
 FEATURE_CFLAGS += -D'CONFIG_DEDIPROG=1'
 FEATURE_LIBS += -lusb
@@ -482,6 +484,11 @@ PROGRAMMER_OBJS += satamv.o
 NEED_PCI := yes
 endif
 
+ifeq ($(CONFIG_LINUX_SPI), yes)
+FEATURE_CFLAGS += -D'CONFIG_LINUX_SPI=1'
+PROGRAMMER_OBJS += linux_spi.o
+endif
+
 ifeq ($(NEED_SERIAL), yes)
 LIB_OBJS += serial.o
 endif

flashrom.8

@@ -205,6 +205,8 @@ or Xilinx DLC5 compatible cable)
 .sp
 .BR "* ogp_spi" " (for SPI flash ROMs on Open Graphics Project graphics card)"
 .sp
+.BR "* linux_spi" " (for SPI flash ROMs accessible via /dev/spidevX.Y on Linux)"
+.sp
 Some programmers have optional or mandatory parameters which are described
 in detail in the
 .B PROGRAMMER SPECIFIC INFO
@@ -639,6 +641,17 @@ section above.
 .sp
 More information about the hardware is available at
 .BR http://wiki.opengraphics.org .
+.SS
+.BR "linux_spi " programmer
+You have to specify the SPI controller to use with the
+.sp
+.B "  flashrom \-p linux_spi:dev=/dev/spidevX.Y"
+.sp
+syntax where
+.B /dev/spidevX.Y
+is the Linux device node for your SPI controller.
+.sp
+Please note that the linux_spi driver only works on Linux.
 .SH EXIT STATUS
 flashrom exits with 0 on success, 1 on most failures but with 2 if /dev/mem
 (/dev/xsvc on Solaris) can not be opened and with 3 if a call to mmap() fails.

print.c

@@ -527,6 +527,11 @@ void print_supported(void)
 	       programmer_table[PROGRAMMER_SATAMV].name);
 	print_supported_pcidevs(satas_mv);
 #endif
+#if CONFIG_LINUX_SPI == 1
+	msg_ginfo("\nSupported devices for the %s programmer:\n",
+	       programmer_table[PROGRAMMER_LINUX_SPI].name);
+	msg_ginfo("Device files /dev/spidev*.*\n");
+#endif
 }
 
 #if CONFIG_INTERNAL == 1