bcm53xx: backport Broadcom's iProc QSPI driver

This driver has been added instead of improving spi-bcm53xx. It has some
advantages: allows SPI speed control & hopefully doesn't have bug that
was stopping us from using multiple SPI messages for writing flash data.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>

1 files changed, 63 insertions, 0 deletions

diff --git a/target/linux/bcm53xx/patches-4.4/083-0005-spi-bcm-qspi-fix-suspend-resume-ifdef.patch b/target/linux/bcm53xx/patches-4.4/083-0005-spi-bcm-qspi-fix-suspend-resume-ifdef.patch
new file mode 100644
index 0000000000..aad22d2ee8
--- /dev/null
+++ b/target/linux/bcm53xx/patches-4.4/083-0005-spi-bcm-qspi-fix-suspend-resume-ifdef.patch
@@ -0,0 +1,63 @@
+From a0319f8b12c0fb9800da61f4cba9bd6fd80e37a4 Mon Sep 17 00:00:00 2001
+From: Arnd Bergmann <arnd@arndb.de>
+Date: Thu, 15 Sep 2016 17:46:53 +0200
+Subject: [PATCH] spi: bcm-qspi: fix suspend/resume #ifdef
+
+The two power management functions are define inside of an #ifdef
+but referenced unconditionally, which is obviously broken when
+CONFIG_PM_SLEEP is not set:
+
+drivers/spi/spi-bcm-qspi.c:1300:13: error: 'bcm_qspi_suspend' undeclared here (not in a function)
+drivers/spi/spi-bcm-qspi.c:1301:13: error: 'bcm_qspi_resume' undeclared here (not in a function)
+
+This replaces the #ifdef with a __maybe_unused annotation that lets
+the compiler figure out whether to drop the functions itself,
+and uses SIMPLE_DEV_PM_OPS() to refer to the functions.
+
+This will also fill the freeze/thaw/poweroff/restore callback
+pointers in addition to suspend/resume, but as far as I can tell,
+this is what we want.
+
+Signed-off-by: Arnd Bergmann <arnd@arndb.de>
+Fixes: fa236a7ef240 ("spi: bcm-qspi: Add Broadcom MSPI driver")
+Signed-off-by: Mark Brown <broonie@kernel.org>
+---
+ drivers/spi/spi-bcm-qspi.c | 12 ++++--------
+ 1 file changed, 4 insertions(+), 8 deletions(-)
+
+--- a/drivers/spi/spi-bcm-qspi.c
++++ b/drivers/spi/spi-bcm-qspi.c
+@@ -1268,8 +1268,7 @@ int bcm_qspi_remove(struct platform_devi
+ /* function to be called by SoC specific platform driver remove() */
+ EXPORT_SYMBOL_GPL(bcm_qspi_remove);
+ 
+-#ifdef CONFIG_PM_SLEEP
+-static int bcm_qspi_suspend(struct device *dev)
++static int __maybe_unused bcm_qspi_suspend(struct device *dev)
+ {
+ 	struct bcm_qspi *qspi = dev_get_drvdata(dev);
+ 
+@@ -1280,7 +1279,7 @@ static int bcm_qspi_suspend(struct devic
+ 	return 0;
+ };
+ 
+-static int bcm_qspi_resume(struct device *dev)
++static int __maybe_unused bcm_qspi_resume(struct device *dev)
+ {
+ 	struct bcm_qspi *qspi = dev_get_drvdata(dev);
+ 	int ret = 0;
+@@ -1293,12 +1292,9 @@ static int bcm_qspi_resume(struct device
+ 
+ 	return ret;
+ }
+-#endif /* CONFIG_PM_SLEEP */
+ 
+-const struct dev_pm_ops bcm_qspi_pm_ops = {
+-	.suspend = bcm_qspi_suspend,
+-	.resume  = bcm_qspi_resume,
+-};
++SIMPLE_DEV_PM_OPS(bcm_qspi_pm_ops, bcm_qspi_suspend, bcm_qspi_resume);
++
+ /* pm_ops to be called by SoC specific platform driver */
+ EXPORT_SYMBOL_GPL(bcm_qspi_pm_ops);
+