[PATCH 03/17] phy: ti-pipe3: add external clock support for PCIe PHY

[Kishon Vijay Abraham I]

APLL used by PCIE phy can either use external clock as input or the clock
from DPLL. Added support for the APLL to use external clock as input here.

Cc: Rajendra Nayak <rnayak at ti.com>
Cc: Tero Kristo <t-kristo at ti.com>
Cc: Paul Walmsley <paul at pwsan.com>
Signed-off-by: Kishon Vijay Abraham I <kishon at ti.com>
---
 Documentation/devicetree/bindings/phy/ti-phy.txt |    4 ++
 drivers/phy/phy-ti-pipe3.c                       |   75 ++++++++++++++--------
 2 files changed, 52 insertions(+), 27 deletions(-)

diff --git a/Documentation/devicetree/bindings/phy/ti-phy.txt b/Documentation/devicetree/bindings/phy/ti-phy.txt
index bc9afb5..d50f8ee 100644
--- a/Documentation/devicetree/bindings/phy/ti-phy.txt
+++ b/Documentation/devicetree/bindings/phy/ti-phy.txt
@@ -76,6 +76,10 @@ Required properties:
    * "dpll_ref_m2" - external dpll ref clk
    * "phy-div" - divider for apll
    * "div-clk" - apll clock
+   * "apll_mux" - mux for pcie apll
+   * "refclk_ext" - external reference clock for pcie apll
+ - ti,ext-clk: To specifiy if PCIE apll should use external clock. Applicable
+   only to PCIE PHY.
 
 Optional properties:
  - ctrl-module : phandle of the control module used by PHY driver to power on
diff --git a/drivers/phy/phy-ti-pipe3.c b/drivers/phy/phy-ti-pipe3.c
index d43019d..5513aa0 100644
--- a/drivers/phy/phy-ti-pipe3.c
+++ b/drivers/phy/phy-ti-pipe3.c
@@ -293,7 +293,7 @@ static int ti_pipe3_probe(struct platform_device *pdev)
 	struct device_node *control_node;
 	struct platform_device *control_pdev;
 	const struct of_device_id *match;
-	struct clk *clk;
+	struct clk *clk, *pclk;
 
 	phy = devm_kzalloc(&pdev->dev, sizeof(*phy), GFP_KERNEL);
 	if (!phy) {
@@ -302,6 +302,20 @@ static int ti_pipe3_probe(struct platform_device *pdev)
 	}
 	phy->dev		= &pdev->dev;
 
+	control_node = of_parse_phandle(node, "ctrl-module", 0);
+	if (!control_node) {
+		dev_err(&pdev->dev, "Failed to get control device phandle\n");
+		return -EINVAL;
+	}
+
+	control_pdev = of_find_device_by_node(control_node);
+	if (!control_pdev) {
+		dev_err(&pdev->dev, "Failed to get control device\n");
+		return -EINVAL;
+	}
+
+	phy->control_dev = &control_pdev->dev;
+
 	if (!of_device_is_compatible(node, "ti,phy-pipe3-pcie")) {
 		match = of_match_device(of_match_ptr(ti_pipe3_id_table),
 					&pdev->dev);
@@ -345,19 +359,40 @@ static int ti_pipe3_probe(struct platform_device *pdev)
 	}
 
 	if (of_device_is_compatible(node, "ti,phy-pipe3-pcie")) {
-		clk = devm_clk_get(phy->dev, "dpll_ref");
-		if (IS_ERR(clk)) {
-			dev_err(&pdev->dev, "unable to get dpll ref clk\n");
-			return PTR_ERR(clk);
+		if (!of_property_read_bool(node, "ti,ext-clk")) {
+			clk = devm_clk_get(phy->dev, "dpll_ref");
+			if (IS_ERR(clk)) {
+				dev_err(&pdev->dev,
+					"unable to get dpll ref clk\n");
+				return PTR_ERR(clk);
+			}
+			clk_set_rate(clk, 1500000000);
+
+			clk = devm_clk_get(phy->dev, "dpll_ref_m2");
+			if (IS_ERR(clk)) {
+				dev_err(&pdev->dev,
+					"unable to get dpll ref m2 clk\n");
+				return PTR_ERR(clk);
+			}
+			clk_set_rate(clk, 100000000);
+		} else {
+			omap_control_pcie_tx_rx_control(phy->control_dev,
+						OMAP_CTRL_PCIE_PHY_RX_ACSPCIE);
+
+			clk = clk_get(phy->dev, "apll_mux");
+			if (IS_ERR(clk)) {
+				dev_err(&pdev->dev, "unable to get apll mux clk\n");
+				return PTR_ERR(clk);
+			}
+
+			pclk = clk_get(phy->dev, "refclk_ext");
+			if (IS_ERR(pclk)) {
+				dev_err(&pdev->dev, "unable to get ext ref clk for apll\n");
+				return PTR_ERR(pclk);
+			}
+
+			clk_set_parent(clk, pclk);
 		}
-		clk_set_rate(clk, 1500000000);
-
-		clk = devm_clk_get(phy->dev, "dpll_ref_m2");
-		if (IS_ERR(clk)) {
-			dev_err(&pdev->dev, "unable to get dpll ref m2 clk\n");
-			return PTR_ERR(clk);
-		}
-		clk_set_rate(clk, 100000000);
 
 		clk = devm_clk_get(phy->dev, "phy-div");
 		if (IS_ERR(clk)) {
@@ -375,20 +410,6 @@ static int ti_pipe3_probe(struct platform_device *pdev)
 		phy->div_clk = ERR_PTR(-ENODEV);
 	}
 
-	control_node = of_parse_phandle(node, "ctrl-module", 0);
-	if (!control_node) {
-		dev_err(&pdev->dev, "Failed to get control device phandle\n");
-		return -EINVAL;
-	}
-
-	control_pdev = of_find_device_by_node(control_node);
-	if (!control_pdev) {
-		dev_err(&pdev->dev, "Failed to get control device\n");
-		return -EINVAL;
-	}
-
-	phy->control_dev = &control_pdev->dev;
-
 	omap_control_phy_power(phy->control_dev, 0);
 
 	platform_set_drvdata(pdev, phy);
-- 
1.7.9.5