linux-kernel - [PATCH v8 01/14] mfd: omap-usb-host: Get clocks based on hardware revision

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Date:	Thu, 20 Feb 2014 13:39:56 +0200
From:	Roger Quadros <rogerq@...com>
To:	<tony@...mide.com>, <bcousson@...libre.com>, <lee.jones@...aro.org>
CC:	<balbi@...com>, <nm@...com>, <khilman@...aro.org>,
	<linux-omap@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux-usb@...r.kernel.org>, Roger Quadros <rogerq@...com>,
	Samuel Ortiz <sameo@...ux.intel.com>
Subject: [PATCH v8 01/14] mfd: omap-usb-host: Get clocks based on hardware revision

Not all revisions have all the clocks so get the necessary clocks
based on hardware revision.

This should avoid un-necessary clk_get failure messages that were
observed earlier.

CC: Lee Jones <lee.jones@...aro.org>
CC: Samuel Ortiz <sameo@...ux.intel.com>
Signed-off-by: Roger Quadros <rogerq@...com>
---
 drivers/mfd/omap-usb-host.c | 43 ++++++++++++++++++++++++++++++++-----------
 1 file changed, 32 insertions(+), 11 deletions(-)

diff --git a/drivers/mfd/omap-usb-host.c b/drivers/mfd/omap-usb-host.c
index 0c3c9a0..c63bfdf 100644
--- a/drivers/mfd/omap-usb-host.c
+++ b/drivers/mfd/omap-usb-host.c
@@ -665,22 +665,43 @@ static int usbhs_omap_probe(struct platform_device *pdev)
 		goto err_mem;
 	}
 
-	need_logic_fck = false;
+	/* Set all clocks as invalid to begin with */
+	omap->ehci_logic_fck = ERR_PTR(-ENODEV);
+	omap->init_60m_fclk = ERR_PTR(-ENODEV);
+	omap->utmi_p1_gfclk = ERR_PTR(-ENODEV);
+	omap->utmi_p2_gfclk = ERR_PTR(-ENODEV);
+	omap->xclk60mhsp1_ck = ERR_PTR(-ENODEV);
+	omap->xclk60mhsp2_ck = ERR_PTR(-ENODEV);
+
 	for (i = 0; i < omap->nports; i++) {
-		if (is_ehci_phy_mode(i) || is_ehci_tll_mode(i) ||
-			is_ehci_hsic_mode(i))
-				need_logic_fck |= true;
+		omap->utmi_clk[i] = ERR_PTR(-ENODEV);
+		omap->hsic480m_clk[i] = ERR_PTR(-ENODEV);
+		omap->hsic60m_clk[i] = ERR_PTR(-ENODEV);
 	}
 
-	omap->ehci_logic_fck = ERR_PTR(-EINVAL);
-	if (need_logic_fck) {
-		omap->ehci_logic_fck = devm_clk_get(dev, "ehci_logic_fck");
-		if (IS_ERR(omap->ehci_logic_fck)) {
-			ret = PTR_ERR(omap->ehci_logic_fck);
-			dev_dbg(dev, "ehci_logic_fck failed:%d\n", ret);
+	/* for OMAP3 i.e. USBHS REV1 */
+	if (omap->usbhs_rev == OMAP_USBHS_REV1) {
+		need_logic_fck = false;
+		for (i = 0; i < omap->nports; i++) {
+			if (is_ehci_phy_mode(pdata->port_mode[i]) ||
+			    is_ehci_tll_mode(pdata->port_mode[i]) ||
+			    is_ehci_hsic_mode(pdata->port_mode[i]))
+
+				need_logic_fck |= true;
+		}
+
+		if (need_logic_fck) {
+			omap->ehci_logic_fck = devm_clk_get(dev,
+							    "ehci_logic_fck");
+			if (IS_ERR(omap->ehci_logic_fck)) {
+				ret = PTR_ERR(omap->ehci_logic_fck);
+				dev_dbg(dev, "ehci_logic_fck failed:%d\n", ret);
+			}
 		}
+		goto initialize;
 	}
 
+	/* for OMAP4+ i.e. USBHS REV2+ */
 	omap->utmi_p1_gfclk = devm_clk_get(dev, "utmi_p1_gfclk");
 	if (IS_ERR(omap->utmi_p1_gfclk)) {
 		ret = PTR_ERR(omap->utmi_p1_gfclk);
@@ -748,7 +769,6 @@ static int usbhs_omap_probe(struct platform_device *pdev)
 	}
 
 	if (is_ehci_phy_mode(pdata->port_mode[0])) {
-		/* for OMAP3, clk_set_parent fails */
 		ret = clk_set_parent(omap->utmi_p1_gfclk,
 					omap->xclk60mhsp1_ck);
 		if (ret != 0)
@@ -776,6 +796,7 @@ static int usbhs_omap_probe(struct platform_device *pdev)
 					ret);
 	}
 
+initialize:
 	omap_usbhs_init(dev);
 
 	if (dev->of_node) {
-- 
1.8.3.2

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