Sergey Alirzaev has uploaded this change for review.

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ft2232_spi: add an ability to use GPIO for chip selection

Change-Id: I6db05619e0d69ad18549c8556ef69225337b1532
Signed-off-by: Sergey Alirzaev <zl29ah@gmail.com>
---
M flashrom.8.tmpl
M ft2232_spi.c
2 files changed, 27 insertions(+), 6 deletions(-)

git pull ssh://review.coreboot.org:29418/flashrom refs/changes/11/28911/1

diff --git a/flashrom.8.tmpl b/flashrom.8.tmpl
index 70af395..cbb3378 100644
--- a/flashrom.8.tmpl
+++ b/flashrom.8.tmpl
@@ -722,9 +722,9 @@
 Multi-Protocol Adapter (TUMPA), TUMPA Lite, GOEPEL PicoTAP and Google Servo v1/v2.
 .sp
 An optional parameter specifies the controller
-type and channel/interface/port it should support. For that you have to use the
+type and channel/interface/port/GPIO-based chip select it should support. For that you have to use the
 .sp
-.B "  flashrom \-p ft2232_spi:type=model,port=interface"
+.B "  flashrom \-p ft2232_spi:type=model,port=interface,csgpiol=gpio"
 .sp
 syntax where
 .B model
@@ -733,14 +733,17 @@
 arm-usb-tiny ", " arm-usb-tiny-h ", " arm-usb-ocd ", " arm-usb-ocd-h \
 ", " tumpa ", " tumpalite ", " picotap ", " google-servo ", " google-servo-v2 \
 " or " google-servo-v2-legacy
-and
 .B interface
 can be
-.BR A ", " B ", " C ", or " D .
+.BR A ", " B ", " C ", or " D
+and
+.B csgpiol
+can be a number between 0 and 3, denoting GPIOL0-GPIOL3 correspondingly.
 The default model is
 .B 4232H
-and the default interface is
-.BR A .
+the default interface is
+.BR A
+and GPIO is not used by default.
 .sp
 If there is more than one ft2232_spi-compatible device connected, you can select which one should be used by
 specifying its serial number with the
diff --git a/ft2232_spi.c b/ft2232_spi.c
index 819744c..79d9d82 100644
--- a/ft2232_spi.c
+++ b/ft2232_spi.c
@@ -327,6 +327,24 @@
 	}
 	free(arg);
 
+	arg = extract_programmer_param("csgpiol");
+	if (arg && strlen(arg)) {
+		unsigned int temp = 0;
+		char *endptr;
+		temp = strtoul(arg, &endptr, 10);
+		if (*endptr || temp > 3) {
+			msg_perr("Error: Invalid GPIOL specified: \"%s\".\n"
+				 "Valid values are between 0 and 3.\n", arg);
+			free(arg);
+			return -2;
+		} else {
+			unsigned pin = temp + 4;
+			cs_bits |= 1 << pin;
+			pindir |= 1 << pin;
+		}
+	}
+	free(arg);
+
 	msg_pdbg("Using device type %s %s ",
 		 get_ft2232_vendorname(ft2232_vid, ft2232_type),
 		 get_ft2232_devicename(ft2232_vid, ft2232_type));

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