On 09/19/2012 01:56 PM, Felipe Balbi wrote:
> On Wed, Sep 19, 2012 at 05:00:29PM +0530, Kishon Vijay Abraham I wrote:
>> "usb_otg_ss_refclk960m" is needed by usb2 phy present in omap5. For
>> omap4, the clk_get of this clock will fail since it does not have this
>> clock.
>>
>> Signed-off-by: Kishon Vijay Abraham I <kishon@xxxxxx>
>> ---
>> Documentation/devicetree/bindings/usb/usb-phy.txt | 3 +++
>> drivers/usb/phy/omap-usb2.c | 28 ++++++++++++++++++++-
>> 2 files changed, 30 insertions(+), 1 deletion(-)
>>
>> diff --git a/Documentation/devicetree/bindings/usb/usb-phy.txt b/Documentation/devicetree/bindings/usb/usb-phy.txt
>> index 7c5fd89..d5626de 100644
>> --- a/Documentation/devicetree/bindings/usb/usb-phy.txt
>> +++ b/Documentation/devicetree/bindings/usb/usb-phy.txt
>> @@ -24,6 +24,9 @@ Required properties:
>> add the address of control module phy power register until a driver for
>> control module is added
>>
>> +Optional properties:
>> + - has960mhzclk: should be added if the phy needs 960mhz clock
>> +
>> This is usually a subnode of ocp2scp to which it is connected.
>>
>> usb3phy@4a084400 {
>> diff --git a/drivers/usb/phy/omap-usb2.c b/drivers/usb/phy/omap-usb2.c
>> index d36c282..d6612ba 100644
>> --- a/drivers/usb/phy/omap-usb2.c
>> +++ b/drivers/usb/phy/omap-usb2.c
>> @@ -146,6 +146,7 @@ static int __devinit omap_usb2_probe(struct platform_device *pdev)
>> struct omap_usb *phy;
>> struct usb_otg *otg;
>> struct resource *res;
>> + struct device_node *np = pdev->dev.of_node;
>>
>> phy = devm_kzalloc(&pdev->dev, sizeof(*phy), GFP_KERNEL);
>> if (!phy) {
>> @@ -190,6 +191,15 @@ static int __devinit omap_usb2_probe(struct platform_device *pdev)
>> }
>> clk_prepare(phy->wkupclk);
>>
>> + if (of_property_read_bool(np, "has960mhzclk")) {
>> + phy->optclk = devm_clk_get(phy->dev, "usb_otg_ss_refclk960m");
>> + if (IS_ERR(phy->optclk)) {
>> + dev_err(&pdev->dev, "unable to get refclk960m\n");
>> + return PTR_ERR(phy->optclk);
>> + }
>> + clk_prepare(phy->optclk);
>> + }
>
> instead, can't you just always try to get the clock but ignore the error
> if it fails ?
On imx we add no-op dummy clocks, so that the drivers will always find
all needed clocks. If a clk_get fails it's an error.
> If it works you can set a flag to let you know that you can use that
> optional clock.
Marc
--
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