brcm2708: rename all patches from raspberrypi git tree to use 950 prefix

Right now all brcm2708 patches are extracted from the non-mainline
raspberrypi/linux git tree. Many of them are hacks and/or are unneeded
in LEDE. Raspberry Pi is getting better and better mainline support so
it would be nice to finally start maintaining patches in a cleaner way:
1) Backport patches accepted in upstream tree
2) Start using upstream drivers
3) Pick only these patches that are needed for more complete support

Handling above tasks requires grouping patches - ideally using the same
prefixes as generic ones. It means we should rename existing patches to
use some high prefix. This will allow e.g. use 0xx for backported code.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Acked-by: Stijn Tintel <stijn@linux-ipv6.be>

1 files changed, 117 insertions, 0 deletions

diff --git a/target/linux/brcm2708/patches-4.9/950-0112-i2c-bcm2835-Add-support-for-dynamic-clock.patch b/target/linux/brcm2708/patches-4.9/950-0112-i2c-bcm2835-Add-support-for-dynamic-clock.patch
new file mode 100644
index 0000000000..afe2b2297c
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.9/950-0112-i2c-bcm2835-Add-support-for-dynamic-clock.patch
@@ -0,0 +1,117 @@
+From ce8663f1f101f8c7b9037c31269b0b31373737ad Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Noralf=20Tr=C3=B8nnes?= <noralf@tronnes.org>
+Date: Tue, 27 Sep 2016 01:00:08 +0200
+Subject: [PATCH] i2c: bcm2835: Add support for dynamic clock
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Support a dynamic clock by reading the frequency and setting the
+divisor in the transfer function instead of during probe.
+
+Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
+Reviewed-by: Martin Sperl <kernel@martin.sperl.org>
+---
+ drivers/i2c/busses/i2c-bcm2835.c | 51 +++++++++++++++++++++++++---------------
+ 1 file changed, 32 insertions(+), 19 deletions(-)
+
+--- a/drivers/i2c/busses/i2c-bcm2835.c
++++ b/drivers/i2c/busses/i2c-bcm2835.c
+@@ -58,6 +58,7 @@ struct bcm2835_i2c_dev {
+ 	void __iomem *regs;
+ 	struct clk *clk;
+ 	int irq;
++	u32 bus_clk_rate;
+ 	struct i2c_adapter adapter;
+ 	struct completion completion;
+ 	struct i2c_msg *curr_msg;
+@@ -78,6 +79,30 @@ static inline u32 bcm2835_i2c_readl(stru
+ 	return readl(i2c_dev->regs + reg);
+ }
+ 
++static int bcm2835_i2c_set_divider(struct bcm2835_i2c_dev *i2c_dev)
++{
++	u32 divider;
++
++	divider = DIV_ROUND_UP(clk_get_rate(i2c_dev->clk),
++			       i2c_dev->bus_clk_rate);
++	/*
++	 * Per the datasheet, the register is always interpreted as an even
++	 * number, by rounding down. In other words, the LSB is ignored. So,
++	 * if the LSB is set, increment the divider to avoid any issue.
++	 */
++	if (divider & 1)
++		divider++;
++	if ((divider < BCM2835_I2C_CDIV_MIN) ||
++	    (divider > BCM2835_I2C_CDIV_MAX)) {
++		dev_err_ratelimited(i2c_dev->dev, "Invalid clock-frequency\n");
++		return -EINVAL;
++	}
++
++	bcm2835_i2c_writel(i2c_dev, BCM2835_I2C_DIV, divider);
++
++	return 0;
++}
++
+ static void bcm2835_fill_txfifo(struct bcm2835_i2c_dev *i2c_dev)
+ {
+ 	u32 val;
+@@ -224,7 +249,7 @@ static int bcm2835_i2c_xfer(struct i2c_a
+ {
+ 	struct bcm2835_i2c_dev *i2c_dev = i2c_get_adapdata(adap);
+ 	unsigned long time_left;
+-	int i;
++	int i, ret;
+ 
+ 	for (i = 0; i < (num - 1); i++)
+ 		if (msgs[i].flags & I2C_M_RD) {
+@@ -233,6 +258,10 @@ static int bcm2835_i2c_xfer(struct i2c_a
+ 			return -EOPNOTSUPP;
+ 		}
+ 
++	ret = bcm2835_i2c_set_divider(i2c_dev);
++	if (ret)
++		return ret;
++
+ 	i2c_dev->curr_msg = msgs;
+ 	i2c_dev->num_msgs = num;
+ 	reinit_completion(&i2c_dev->completion);
+@@ -282,7 +311,6 @@ static int bcm2835_i2c_probe(struct plat
+ {
+ 	struct bcm2835_i2c_dev *i2c_dev;
+ 	struct resource *mem, *irq;
+-	u32 bus_clk_rate, divider;
+ 	int ret;
+ 	struct i2c_adapter *adap;
+ 
+@@ -306,28 +334,13 @@ static int bcm2835_i2c_probe(struct plat
+ 	}
+ 
+ 	ret = of_property_read_u32(pdev->dev.of_node, "clock-frequency",
+-				   &bus_clk_rate);
++				   &i2c_dev->bus_clk_rate);
+ 	if (ret < 0) {
+ 		dev_warn(&pdev->dev,
+ 			 "Could not read clock-frequency property\n");
+-		bus_clk_rate = 100000;
++		i2c_dev->bus_clk_rate = 100000;
+ 	}
+ 
+-	divider = DIV_ROUND_UP(clk_get_rate(i2c_dev->clk), bus_clk_rate);
+-	/*
+-	 * Per the datasheet, the register is always interpreted as an even
+-	 * number, by rounding down. In other words, the LSB is ignored. So,
+-	 * if the LSB is set, increment the divider to avoid any issue.
+-	 */
+-	if (divider & 1)
+-		divider++;
+-	if ((divider < BCM2835_I2C_CDIV_MIN) ||
+-	    (divider > BCM2835_I2C_CDIV_MAX)) {
+-		dev_err(&pdev->dev, "Invalid clock-frequency\n");
+-		return -ENODEV;
+-	}
+-	bcm2835_i2c_writel(i2c_dev, BCM2835_I2C_DIV, divider);
+-
+ 	irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+ 	if (!irq) {
+ 		dev_err(&pdev->dev, "No IRQ resource\n");