pistachio: add 4.9 kernel support

This adds kernel support for the Pistachio SoC and the Marduk (Ci40)
board which uses it.

Much of the code for Pistachio has been upstreamed however some
patches are still required to boot from the Marduk board:
 * spi bug fixes
 * dma bug fixes
 * pistachio internal clock tree bug fixes
 * spi-nand implementation
 * dts based mtd device naming scheme
 * dts backports and bug fixes

Signed-off-by: Abhijit Mahajani <Abhijit.Mahajani@imgtec.com>
Signed-off-by: Francois Berder <francois.berder@imgtec.com>
Signed-off-by: Ian Pozella <Ian.Pozella@imgtec.com>

1 files changed, 56 insertions, 0 deletions

diff --git a/target/linux/pistachio/patches-4.9/108-clk-pistachio-Fix-wrong-SDHost-card-speed.patch b/target/linux/pistachio/patches-4.9/108-clk-pistachio-Fix-wrong-SDHost-card-speed.patch
new file mode 100644
index 0000000000..da2a873e61
--- /dev/null
+++ b/target/linux/pistachio/patches-4.9/108-clk-pistachio-Fix-wrong-SDHost-card-speed.patch
@@ -0,0 +1,56 @@
+From 3642843a06025ec333d7e92580cf52cb8db2a652 Mon Sep 17 00:00:00 2001
+From: Govindraj Raja <Govindraj.Raja@imgtec.com>
+Date: Fri, 8 Jan 2016 16:36:07 +0000
+Subject: clk: pistachio: Fix wrong SDHost card speed
+
+The SDHost currently clocks the card 4x slower than it
+should do, because there is fixed divide by 4 in the
+sdhost wrapper that is not present in the clock tree.
+To model this add a fixed divide by 4 clock node in
+the SDHost clock path.
+
+This will ensure the right clock frequency is selected when
+the mmc driver tries to configure frequency on card insert.
+
+Signed-off-by: Govindraj Raja <Govindraj.Raja@imgtec.com>
+---
+ drivers/clk/pistachio/clk-pistachio.c     | 3 ++-
+ include/dt-bindings/clock/pistachio-clk.h | 1 +
+ 2 files changed, 3 insertions(+), 1 deletion(-)
+
+diff --git a/drivers/clk/pistachio/clk-pistachio.c b/drivers/clk/pistachio/clk-pistachio.c
+index c4ceb5e..1c968d9 100644
+--- a/drivers/clk/pistachio/clk-pistachio.c
++++ b/drivers/clk/pistachio/clk-pistachio.c
+@@ -44,7 +44,7 @@ static struct pistachio_gate pistachio_gates[] __initdata = {
+ 	GATE(CLK_AUX_ADC_INTERNAL, "aux_adc_internal", "sys_internal_div",
+ 	     0x104, 22),
+ 	GATE(CLK_AUX_ADC, "aux_adc", "aux_adc_div", 0x104, 23),
+-	GATE(CLK_SD_HOST, "sd_host", "sd_host_div", 0x104, 24),
++	GATE(CLK_SD_HOST, "sd_host", "sd_host_div4", 0x104, 24),
+ 	GATE(CLK_BT, "bt", "bt_div", 0x104, 25),
+ 	GATE(CLK_BT_DIV4, "bt_div4", "bt_div4_div", 0x104, 26),
+ 	GATE(CLK_BT_DIV8, "bt_div8", "bt_div8_div", 0x104, 27),
+@@ -54,6 +54,7 @@ static struct pistachio_gate pistachio_gates[] __initdata = {
+ static struct pistachio_fixed_factor pistachio_ffs[] __initdata = {
+ 	FIXED_FACTOR(CLK_WIFI_DIV4, "wifi_div4", "wifi_pll", 4),
+ 	FIXED_FACTOR(CLK_WIFI_DIV8, "wifi_div8", "wifi_pll", 8),
++	FIXED_FACTOR(CLK_SDHOST_DIV4, "sd_host_div4", "sd_host_div", 4),
+ };
+ 
+ static struct pistachio_div pistachio_divs[] __initdata = {
+diff --git a/include/dt-bindings/clock/pistachio-clk.h b/include/dt-bindings/clock/pistachio-clk.h
+index 039f83f..77b92ae 100644
+--- a/include/dt-bindings/clock/pistachio-clk.h
++++ b/include/dt-bindings/clock/pistachio-clk.h
+@@ -21,6 +21,7 @@
+ /* Fixed-factor clocks */
+ #define CLK_WIFI_DIV4			16
+ #define CLK_WIFI_DIV8			17
++#define CLK_SDHOST_DIV4			18
+ 
+ /* Gate clocks */
+ #define CLK_MIPS			32
+-- 
+2.7.4
+