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Date: Mon, 7 Oct 2013 06:12:29 -0400
From: Matt Porter <matt.porter@...aro.org>
To: Felipe Balbi <balbi@...com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Rob Herring <rob.herring@...xeda.com>,
Pawel Moll <pawel.moll@....com>,
Mark Rutland <mark.rutland@....com>,
Stephen Warren <swarren@...dia.com>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
Christian Daudt <bcm@...thebug.org>
Cc: Paul Zimmerman <paulz@...opsys.com>,
Linux USB List <linux-usb@...r.kernel.org>,
Linux ARM Kernel List <linux-arm-kernel@...ts.infradead.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Devicetree List <devicetree@...r.kernel.org>,
Linaro Patches <patches@...aro.org>
Subject: [PATCH 2/5] usb: gadget: s3c-hsotg: support configurable UTMI PHY width
Extend dwc2 binding with an optional utmi phy width property.
Enable the s3c-hsotg.c driver to use standard dwc2 binding
and enable configuration of the UTMI phy width based on the
property.
Signed-off-by: Matt Porter <matt.porter@...aro.org>
Reviewed-by: Markus Mayer <markus.mayer@...aro.org>
Reviewed-by: Tim Kryger <tim.kryger@...aro.org>
---
Documentation/devicetree/bindings/staging/dwc2.txt | 4 ++++
drivers/usb/gadget/s3c-hsotg.c | 18 +++++++++++++++++-
drivers/usb/gadget/s3c-hsotg.h | 1 +
3 files changed, 22 insertions(+), 1 deletion(-)
diff --git a/Documentation/devicetree/bindings/staging/dwc2.txt b/Documentation/devicetree/bindings/staging/dwc2.txt
index 1a1b7cf..fb6b8ee 100644
--- a/Documentation/devicetree/bindings/staging/dwc2.txt
+++ b/Documentation/devicetree/bindings/staging/dwc2.txt
@@ -6,10 +6,14 @@ Required properties:
- reg : Should contain 1 register range (address and length)
- interrupts : Should contain 1 interrupt
+Optional properties:
+- snps,phy-utmi-width: Must contain the UTMI data width (either 8 or 16)
+
Example:
usb@...c0000 {
compatible = "ralink,rt3050-usb, snps,dwc2";
reg = <0x101c0000 40000>;
interrupts = <18>;
+ snps,phy-utmi-width = <8>;
};
diff --git a/drivers/usb/gadget/s3c-hsotg.c b/drivers/usb/gadget/s3c-hsotg.c
index 34d80f3..396afb3 100644
--- a/drivers/usb/gadget/s3c-hsotg.c
+++ b/drivers/usb/gadget/s3c-hsotg.c
@@ -137,6 +137,7 @@ struct s3c_hsotg_ep {
* @regs: The memory area mapped for accessing registers.
* @irq: The IRQ number we are using
* @supplies: Definition of USB power supplies
+ * @phyif: PHY interface width
* @dedicated_fifos: Set if the hardware has dedicated IN-EP fifos.
* @num_of_eps: Number of available EPs (excluding EP0)
* @debug_root: root directrory for debugfs.
@@ -164,6 +165,7 @@ struct s3c_hsotg {
struct regulator_bulk_data supplies[ARRAY_SIZE(s3c_hsotg_supply_names)];
+ u32 phyif;
unsigned int dedicated_fifos:1;
unsigned char num_of_eps;
@@ -2212,7 +2214,7 @@ static void s3c_hsotg_core_init(struct s3c_hsotg *hsotg)
*/
/* set the PLL on, remove the HNP/SRP and set the PHY */
- writel(GUSBCFG_PHYIf16 | GUSBCFG_TOutCal(7) |
+ writel(hsotg->phyif | GUSBCFG_TOutCal(7) |
(0x5 << 10), hsotg->regs + GUSBCFG);
s3c_hsotg_init_fifo(hsotg);
@@ -3447,9 +3449,11 @@ static int s3c_hsotg_probe(struct platform_device *pdev)
struct s3c_hsotg_plat *plat = dev_get_platdata(&pdev->dev);
struct usb_phy *phy;
struct device *dev = &pdev->dev;
+ struct device_node *np = dev->of_node;
struct s3c_hsotg_ep *eps;
struct s3c_hsotg *hsotg;
struct resource *res;
+ u32 phy_utmi_width = 16;
int epnum;
int ret;
int i;
@@ -3539,6 +3543,17 @@ static int s3c_hsotg_probe(struct platform_device *pdev)
goto err_supplies;
}
+ /* Set default UTMI width */
+ hsotg->phyif = GUSBCFG_PHYIf16;
+ if (np) {
+ of_property_read_u32(np, "snps,phy-utmi-width",
+ &phy_utmi_width);
+ if (phy_utmi_width == 8)
+ hsotg->phyif = GUSBCFG_PHYIf8;
+ if ((phy_utmi_width != 8) && (phy_utmi_width != 16))
+ dev_warn(dev, "invalid snps,phy-utmi-width value\n");
+ }
+
/* usb phy enable */
s3c_hsotg_phy_enable(hsotg);
@@ -3645,6 +3660,7 @@ static int s3c_hsotg_remove(struct platform_device *pdev)
#ifdef CONFIG_OF
static const struct of_device_id s3c_hsotg_of_ids[] = {
{ .compatible = "samsung,s3c6400-hsotg", },
+ { .compatible = "snps,dwc2", },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, s3c_hsotg_of_ids);
diff --git a/drivers/usb/gadget/s3c-hsotg.h b/drivers/usb/gadget/s3c-hsotg.h
index d650b12..85f549f 100644
--- a/drivers/usb/gadget/s3c-hsotg.h
+++ b/drivers/usb/gadget/s3c-hsotg.h
@@ -55,6 +55,7 @@
#define GUSBCFG_HNPCap (1 << 9)
#define GUSBCFG_SRPCap (1 << 8)
#define GUSBCFG_PHYIf16 (1 << 3)
+#define GUSBCFG_PHYIf8 (0 << 3)
#define GUSBCFG_TOutCal_MASK (0x7 << 0)
#define GUSBCFG_TOutCal_SHIFT (0)
#define GUSBCFG_TOutCal_LIMIT (0x7)
--
1.8.4
--
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