brcm2708: update to latest version

As usual these patches were extracted from the raspberry pi repo:
https://github.com/raspberrypi/linux/commits/rpi-4.4.y

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

1 files changed, 108 insertions, 0 deletions

diff --git a/target/linux/brcm2708/patches-4.4/0121-Extend-clock-timeout-fix-modprobe-baudrate-parameter.patch b/target/linux/brcm2708/patches-4.4/0121-Extend-clock-timeout-fix-modprobe-baudrate-parameter.patch
new file mode 100644
index 0000000000..18d02f2587
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.4/0121-Extend-clock-timeout-fix-modprobe-baudrate-parameter.patch
@@ -0,0 +1,108 @@
+From 127a32cdd6005a42f6b5b63de9d7db573d9de184 Mon Sep 17 00:00:00 2001
+From: Devon Fyson <devonfyson@gmail.com>
+Date: Wed, 30 Dec 2015 16:40:47 -0500
+Subject: [PATCH 121/232] Extend clock timeout, fix modprobe baudrate
+ parameter.
+
+Set the BSC_CLKT clock streching timeout to 35ms as per SMBus specs.\n- Increase priority of baudrate parameter passed to modprobe (in /etc/modprobe.d/*.conf or command line). Currently custom baudrates don't work because they are overridden by clock-frequency in the platform_device passed to the function.
+---
+ drivers/i2c/busses/i2c-bcm2708.c | 45 ++++++++++++++++++++++++++--------------
+ 1 file changed, 29 insertions(+), 16 deletions(-)
+
+--- a/drivers/i2c/busses/i2c-bcm2708.c
++++ b/drivers/i2c/busses/i2c-bcm2708.c
+@@ -71,7 +71,8 @@
+ 
+ #define DRV_NAME		"bcm2708_i2c"
+ 
+-static unsigned int baudrate = CONFIG_I2C_BCM2708_BAUDRATE;
++static unsigned int baudrate_default = CONFIG_I2C_BCM2708_BAUDRATE;
++static unsigned int baudrate;
+ module_param(baudrate, uint, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
+ MODULE_PARM_DESC(baudrate, "The I2C baudrate");
+ 
+@@ -87,6 +88,7 @@ struct bcm2708_i2c {
+ 	int irq;
+ 	struct clk *clk;
+ 	u32 cdiv;
++	u32 clk_tout;
+ 
+ 	struct completion done;
+ 
+@@ -126,7 +128,7 @@ static inline void bcm2708_bsc_fifo_fill
+ 
+ static inline int bcm2708_bsc_setup(struct bcm2708_i2c *bi)
+ {
+-	u32 cdiv, s;
++	u32 cdiv, s, clk_tout;
+ 	u32 c = BSC_C_I2CEN | BSC_C_INTD | BSC_C_ST | BSC_C_CLEAR_1;
+ 	int wait_loops = I2C_WAIT_LOOP_COUNT;
+ 
+@@ -134,12 +136,14 @@ static inline int bcm2708_bsc_setup(stru
+ 	 * Use the value that we cached in the probe.
+ 	 */
+ 	cdiv = bi->cdiv;
++	clk_tout = bi->clk_tout;
+ 
+ 	if (bi->msg->flags & I2C_M_RD)
+ 		c |= BSC_C_INTR | BSC_C_READ;
+ 	else
+ 		c |= BSC_C_INTT;
+ 
++	bcm2708_wr(bi, BSC_CLKT, clk_tout);
+ 	bcm2708_wr(bi, BSC_DIV, cdiv);
+ 	bcm2708_wr(bi, BSC_A, bi->msg->addr);
+ 	bcm2708_wr(bi, BSC_DLEN, bi->msg->len);
+@@ -312,21 +316,24 @@ static int bcm2708_i2c_probe(struct plat
+ 	struct bcm2708_i2c *bi;
+ 	struct i2c_adapter *adap;
+ 	unsigned long bus_hz;
+-	u32 cdiv;
+-
+-	if (pdev->dev.of_node) {
+-		u32 bus_clk_rate;
+-		pdev->id = of_alias_get_id(pdev->dev.of_node, "i2c");
+-		if (pdev->id < 0) {
+-			dev_err(&pdev->dev, "alias is missing\n");
+-			return -EINVAL;
++	u32 cdiv, clk_tout;
++	
++	if (!baudrate) {
++		baudrate = baudrate_default;
++		if (pdev->dev.of_node) {
++			u32 bus_clk_rate;
++			pdev->id = of_alias_get_id(pdev->dev.of_node, "i2c");
++			if (pdev->id < 0) {
++				dev_err(&pdev->dev, "alias is missing\n");
++				return -EINVAL;
++			}
++			if (!of_property_read_u32(pdev->dev.of_node,
++						"clock-frequency", &bus_clk_rate))
++				baudrate = bus_clk_rate;
++			else
++				dev_warn(&pdev->dev,
++					"Could not read clock-frequency property\n");
+ 		}
+-		if (!of_property_read_u32(pdev->dev.of_node,
+-					"clock-frequency", &bus_clk_rate))
+-			baudrate = bus_clk_rate;
+-		else
+-			dev_warn(&pdev->dev,
+-				"Could not read clock-frequency property\n");
+ 	}
+ 
+ 	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+@@ -417,7 +424,13 @@ static int bcm2708_i2c_probe(struct plat
+ 		cdiv = 0xffff;
+ 		baudrate = bus_hz / cdiv;
+ 	}
++	
++ 	clk_tout = 35/1000*baudrate; //35ms timeout as per SMBus specs.
++ 	if (clk_tout > 0xffff)
++		clk_tout = 0xffff;
++	
+ 	bi->cdiv = cdiv;
++	bi->clk_tout = clk_tout;
+ 
+ 	dev_info(&pdev->dev, "BSC%d Controller at 0x%08lx (irq %d) (baudrate %d)\n",
+ 		pdev->id, (unsigned long)regs->start, irq, baudrate);