Subject: [linux-sunxi] [PATCH v3 1/4] ARM: sunxi: Add driver for sunxi usb phy

From: [email-masked] (Hans de Goede)
Date: Sat, 01 Mar 2014 14:17:34 +0100

Hi,

On 02/26/2014 04:12 PM, Chen-Yu Tsai wrote:
> Hi,
> 
> On Sun, Feb 23, 2014 at 8:09 PM, Hans de Goede <[email-masked]> wrote:
>> The Allwinner A1x / A2x SoCs have 2 or 3 usb phys which are all accessed
>> through a single set of registers. Besides this there are also some other
>> phy related bits which need poking, which are per phy, but shared between the
>> ohci and ehci controllers, so these are also controlled from this new phy
>> driver.
>>
>> Signed-off-by: Hans de Goede <[email-masked]>
>> ---
>>  .../devicetree/bindings/phy/sun4i-usb-phy.txt      |  26 ++
>>  drivers/phy/Kconfig                                |  11 +
>>  drivers/phy/Makefile                               |   1 +
>>  drivers/phy/phy-sun4i-usb.c                        | 329 +++++++++++++++++++++
>>  4 files changed, 367 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/phy/sun4i-usb-phy.txt
>>  create mode 100644 drivers/phy/phy-sun4i-usb.c
>>
> [..]
>> diff --git a/drivers/phy/phy-sun4i-usb.c b/drivers/phy/phy-sun4i-usb.c
>> new file mode 100644
>> index 0000000..31c4611
>> --- /dev/null
>> +++ b/drivers/phy/phy-sun4i-usb.c
> [..]
>> +static int sun4i_usb_phy_probe(struct platform_device *pdev)
>> +{
>> +       struct sun4i_usb_phy_data *data;
>> +       struct device *dev = &pdev->dev;
>> +       struct device_node *np = dev->of_node;
>> +       void __iomem *pmu = NULL;
>> +       struct phy_provider *phy_provider;
>> +       struct reset_control *reset;
>> +       struct regulator *vbus;
>> +       struct resource *res;
>> +       struct phy *phy;
>> +       char name[16];
>> +       int i;
>> +
>> +       data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
>> +       if (!data)
>> +               return -ENOMEM;
>> +
>> +       mutex_init(&data->mutex);
>> +
>> +       if (of_device_is_compatible(np, "allwinner,sun5i-a13-usb-phy"))
>> +               data->num_phys = 2;
>> +       else
>> +               data->num_phys = 3;
>> +
>> +       if (of_device_is_compatible(np, "allwinner,sun4i-a10-usb-phy"))
>> +               data->disc_thresh = 3;
>> +       else
>> +               data->disc_thresh = 2;
>> +
>> +       res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "phy_ctrl");
>> +       data->base = devm_ioremap_resource(dev, res);
>> +       if (IS_ERR(data->base))
>> +               return PTR_ERR(data->base);
>> +
>> +       data->clk = devm_clk_get(dev, "usb_phy");
>> +       if (IS_ERR(data->clk)) {
>> +               dev_err(dev, "could not get usb_phy clock\n");
>> +               return PTR_ERR(data->clk);
>> +       }
>> +
>> +       /* Skip 0, 0 is the phy for otg which is not yet supported. */
>> +       for (i = 1; i < data->num_phys; i++) {
>> +               snprintf(name, sizeof(name), "usb%d_vbus", i);
>> +               vbus = devm_regulator_get_optional(dev, name);
>> +               if (IS_ERR(vbus)) {
>> +                       if (PTR_ERR(vbus) == -EPROBE_DEFER)
>> +                               return -EPROBE_DEFER;
>> +                       vbus = NULL;
>> +               }
>> +
>> +               snprintf(name, sizeof(name), "usb%d_reset", i);
>> +               reset = devm_reset_control_get(dev, name);
>> +               if (IS_ERR(reset)) {
> 
> I got around to rebasing my musb tree. I see you fixed the reset
> control error path. You got one.
> 
>> +                       dev_err(dev, "failed to get reset %s\n", name);
>> +                       return PTR_ERR(phy);
> 
> But you missed one here. And phy is uninitialized until later,
> so this will break big time.

Ah, my bad, this is fixed now for v4 of the patch.

Regards,

Hans