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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);
--
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