recipes-kernel: most: add patch set for DT support

This patch adds a set of patches to enable DT usage of the DIM2 module.
It is needed to use the MediaLB (DIM) interface with the Kingfisher.

Change-Id: Idd71bea6f2c17cb579f0b44884037e7046380034
Signed-off-by: Christian Gromm <christian.gromm@microchip.com>

1 files changed, 92 insertions, 0 deletions

diff --git a/recipes-kernel/most/files/0008-dim2-read-clock-speed-from-the-device-tree.patch b/recipes-kernel/most/files/0008-dim2-read-clock-speed-from-the-device-tree.patch
new file mode 100644
index 000000000..1b01fb156
--- /dev/null
+++ b/recipes-kernel/most/files/0008-dim2-read-clock-speed-from-the-device-tree.patch
@@ -0,0 +1,92 @@
+From 839ad403a2d8081a6c15f6fc2836b01919338f3c Mon Sep 17 00:00:00 2001
+From: Andrey Shvetsov <andrey.shvetsov@k2l.de>
+Date: Mon, 12 Feb 2018 12:24:37 +0100
+Subject: [PATCH] staging: most: dim2: read clock speed from the device tree
+
+This implements reading of the clock speed parameter from the device
+tree.
+
+Signed-off-by: Andrey Shvetsov <andrey.shvetsov@k2l.de>
+---
+ Documentation/devicetree/bindings/inic/microchip,inic-dim2.txt | 64 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+ hdm-dim2/dim2_hdm.c                       | 50 +++++++++++++++++++++++++++++++++++++++++++++++++-
+ 2 files changed, 113 insertions(+), 1 deletion(-)
+ create mode 100644 Documentation/devicetree/bindings/inic/microchip,inic-dim2.txt
+
+diff --git a/hdm-dim2/dim2_hdm.c b/hdm-dim2/dim2_hdm.c
+index 2dba917..05e1896 100644
+--- a/hdm-dim2/dim2_hdm.c
++++ b/hdm-dim2/dim2_hdm.c
+@@ -698,6 +698,42 @@ static void dma_free(struct mbo *mbo, u32 size)
+
+ static const struct of_device_id dim2_of_match[];
+
++static struct {
++	const char *clock_speed;
++	u8 clk_speed;
++} clk_mt[] = {
++	{ "256fs", CLK_256FS },
++	{ "512fs", CLK_512FS },
++	{ "1024fs", CLK_1024FS },
++	{ "2048fs", CLK_2048FS },
++	{ "3072fs", CLK_3072FS },
++	{ "4096fs", CLK_4096FS },
++	{ "6144fs", CLK_6144FS },
++	{ "8192fs", CLK_8192FS },
++};
++
++/**
++ * get_dim2_clk_speed - converts string to DIM2 clock speed value
++ *
++ * @clock_speed: string in the format "{NUMBER}fs"
++ * @val: pointer to get one of the CLK_{NUMBER}FS values
++ *
++ * By success stores one of the CLK_{NUMBER}FS in the *val and returns 0,
++ * otherwise returns -EINVAL.
++ */
++static int get_dim2_clk_speed(const char *clock_speed, u8 *val)
++{
++	int i;
++
++	for (i = 0; i < ARRAY_SIZE(clk_mt); i++) {
++		if (!strcmp(clock_speed, clk_mt[i].clock_speed)) {
++			*val = clk_mt[i].clk_speed;
++			return 0;
++		}
++	}
++	return -EINVAL;
++}
++
+ /*
+  * dim2_probe - dim2 probe handler
+  * @pdev: platform device structure
+@@ -708,6 +744,7 @@ static const struct of_device_id dim2_of_match[];
+ static int dim2_probe(struct platform_device *pdev)
+ {
+	const struct dim2_platform_data *pdata;
++	const char *clock_speed;
+	struct dim2_hdm *dev;
+	struct resource *res;
+	int ret, i;
+@@ -725,7 +762,18 @@ static int dim2_probe(struct platform_device *pdev)
+
+	platform_set_drvdata(pdev, dev);
+
+-	dev->clk_speed = CLK_4096FS;
++	ret = of_property_read_string(pdev->dev.of_node,
++				      "microchip,clock-speed", &clock_speed);
++	if (ret) {
++		dev_err(&pdev->dev, "missing dt property clock-speed\n");
++		return ret;
++	}
++
++	ret = get_dim2_clk_speed(clock_speed, &dev->clk_speed);
++	if (ret) {
++		dev_err(&pdev->dev, "bad dt property clock-speed\n");
++		return ret;
++	}
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	dev->io_base = devm_ioremap_resource(&pdev->dev, res);
+--
+libgit2 0.26.0