[PATCH V4 2/6] clk: exynos-audss: allow input clocks to be specified in device tree

[Andrew Bresticker]

This allows the input clocks to the Exynos AudioSS block to be
specified via device-tree bindings.  Default names will be used
when an input clock is not given.

Signed-off-by: Andrew Bresticker <abrestic at chromium.org>
---
Changes since v1:
 - listed input clocks as required properties
---
 .../devicetree/bindings/clock/clk-exynos-audss.txt | 32 ++++++++++++++++++++--
 drivers/clk/samsung/clk-exynos-audss.c             | 25 +++++++++++++----
 2 files changed, 50 insertions(+), 7 deletions(-)

diff --git a/Documentation/devicetree/bindings/clock/clk-exynos-audss.txt b/Documentation/devicetree/bindings/clock/clk-exynos-audss.txt
index 75e2e19..85b9e28 100644
--- a/Documentation/devicetree/bindings/clock/clk-exynos-audss.txt
+++ b/Documentation/devicetree/bindings/clock/clk-exynos-audss.txt
@@ -14,6 +14,21 @@ Required Properties:
 
 - #clock-cells: should be 1.
 
+- clocks:
+  - pll_ref: Fixed rate PLL reference clock, parent of mout_audss. "fin_pll"
+    is used if not specified.
+  - pll_in: Input PLL to the AudioSS block, parent of mout_audss. "fout_epll"
+    is used if not specified.
+  - cdclk: External i2s clock, parent of mout_i2s. "cdclk0" is used if not
+    specified.
+  - sclk_audio: Audio bus clock, parent of mout_i2s. "sclk_audio0" is used if
+    not specified.
+  - sclk_pcm_in: PCM clock, parent of sclk_pcm.  "sclk_pcm0" is used if not
+    specified.
+
+- clock-names: Aliases for the above clocks. They should be "pll_ref",
+  "pll_in", "cdclk", "sclk_audio", and "sclk_pcm_in" respectively.
+
 The following is the list of clocks generated by the controller. Each clock is
 assigned an identifier and client nodes use this identifier to specify the
 clock which they consume. Some of the clocks are available only on a particular
@@ -35,15 +50,28 @@ sclk_i2s        7
 pcm_bus         8
 sclk_pcm        9
 
-Example 1: An example of a clock controller node is listed below.
+Example 1: An example of a clock controller node using the default input
+	   clock names is listed below.
+
+clock_audss: audss-clock-controller at 3810000 {
+	compatible = "samsung,exynos5250-audss-clock";
+	reg = <0x03810000 0x0C>;
+	#clock-cells = <1>;
+};
+
+Example 2: An example of a clock controller node with the input clocks
+           specified.
 
 clock_audss: audss-clock-controller at 3810000 {
 	compatible = "samsung,exynos5250-audss-clock";
 	reg = <0x03810000 0x0C>;
 	#clock-cells = <1>;
+	clocks = <&clock 1>, <&clock 7>, <&clock 138>, <&clock 160>,
+		<&ext_i2s_clk>;
+	clock-names = "pll_ref", "pll_in", "sclk_audio", "sclk_pcm_in", "cdclk";
 };
 
-Example 2: I2S controller node that consumes the clock generated by the clock
+Example 3: I2S controller node that consumes the clock generated by the clock
            controller. Refer to the standard clock bindings for information
            about 'clocks' and 'clock-names' property.
 
diff --git a/drivers/clk/samsung/clk-exynos-audss.c b/drivers/clk/samsung/clk-exynos-audss.c
index 742dabc..7cb10f2 100644
--- a/drivers/clk/samsung/clk-exynos-audss.c
+++ b/drivers/clk/samsung/clk-exynos-audss.c
@@ -34,10 +34,6 @@ static unsigned long reg_save[][2] = {
 	{ASS_CLK_GATE, 0},
 };
 
-/* list of all parent clock list */
-static const char *mout_audss_p[] = { "fin_pll", "fout_epll" };
-static const char *mout_i2s_p[] = { "mout_audss", "cdclk0", "sclk_audio0" };
-
 #ifdef CONFIG_PM_SLEEP
 static int exynos_audss_clk_suspend(void)
 {
@@ -68,6 +64,10 @@ static int exynos_audss_clk_probe(struct platform_device *pdev)
 {
 	int i, ret = 0;
 	struct resource *res;
+	const char *mout_audss_p[] = {"fin_pll", "fout_epll"};
+	const char *mout_i2s_p[] = {"mout_audss", "cdclk0", "sclk_audio0"};
+	const char *sclk_pcm_p = "sclk_pcm0";
+	struct clk *pll_ref, *pll_in, *cdclk, *sclk_audio, *sclk_pcm_in;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	reg_base = devm_ioremap_resource(&pdev->dev, res);
@@ -85,11 +85,23 @@ static int exynos_audss_clk_probe(struct platform_device *pdev)
 	clk_data.clks = clk_table;
 	clk_data.clk_num = EXYNOS_AUDSS_MAX_CLKS;
 
+	pll_ref = devm_clk_get(&pdev->dev, "pll_ref");
+	pll_in = devm_clk_get(&pdev->dev, "pll_in");
+	if (!IS_ERR(pll_ref))
+		mout_audss_p[0] = __clk_get_name(pll_ref);
+	if (!IS_ERR(pll_in))
+		mout_audss_p[1] = __clk_get_name(pll_in);
 	clk_table[EXYNOS_MOUT_AUDSS] = clk_register_mux(NULL, "mout_audss",
 				mout_audss_p, ARRAY_SIZE(mout_audss_p),
 				CLK_SET_RATE_NO_REPARENT,
 				reg_base + ASS_CLK_SRC, 0, 1, 0, &lock);
 
+	cdclk = devm_clk_get(&pdev->dev, "cdclk");
+	sclk_audio = devm_clk_get(&pdev->dev, "sclk_audio");
+	if (!IS_ERR(cdclk))
+		mout_i2s_p[1] = __clk_get_name(cdclk);
+	if (!IS_ERR(sclk_audio))
+		mout_i2s_p[2] = __clk_get_name(sclk_audio);
 	clk_table[EXYNOS_MOUT_I2S] = clk_register_mux(NULL, "mout_i2s",
 				mout_i2s_p, ARRAY_SIZE(mout_i2s_p),
 				CLK_SET_RATE_NO_REPARENT,
@@ -123,8 +135,11 @@ static int exynos_audss_clk_probe(struct platform_device *pdev)
 				 "sclk_pcm", CLK_SET_RATE_PARENT,
 				reg_base + ASS_CLK_GATE, 4, 0, &lock);
 
+	sclk_pcm_in = devm_clk_get(&pdev->dev, "sclk_pcm_in");
+	if (!IS_ERR(sclk_pcm_in))
+		sclk_pcm_p = __clk_get_name(sclk_pcm_in);
 	clk_table[EXYNOS_SCLK_PCM] = clk_register_gate(NULL, "sclk_pcm",
-				"div_pcm0", CLK_SET_RATE_PARENT,
+				sclk_pcm_p, CLK_SET_RATE_PARENT,
 				reg_base + ASS_CLK_GATE, 5, 0, &lock);
 
 	for (i = 0; i < clk_data.clk_num; i++) {
-- 
1.8.4