On Sun, Jun 22, 2014 at 10:04:57AM +0100, Robert Jarzmik wrote:
> Add support for device-tree device discovery. If devicetree is not
> provided, fallback to legacy platform data "discovery".
>
> Signed-off-by: Robert Jarzmik <robert.jarz...@free.fr>
> Cc: devicet...@vger.kernel.org
>
> ---
> Since V1: change OF id mrvl,pxa27x_udc -> marvell,pxa27x-udc
> This is a consequence of other DT reviews on the marvell
> namings.
> ---
> drivers/usb/gadget/pxa27x_udc.c | 105
> ++++++++++++++++++++++++++++++++--------
> drivers/usb/gadget/pxa27x_udc.h | 4 ++
> 2 files changed, 90 insertions(+), 19 deletions(-)
[...]
> +/**
> + * pxa_udc_probe_dt - device tree specific probe
> + * @pdev: platform data
> + * @udc: pxa_udc structure to fill
> + *
> + * Fills udc from platform data out of device tree.
> + *
> + * Returns 0 if DT found, 1 if DT not found, and <0 on error
That's impossible as this function is marked as returning bool.
Make this an int and return negative error codes.
> + */
> +bool pxa_udc_probe_dt(struct platform_device *pdev, struct pxa_udc *udc)
> +{
> + struct device_node *np = pdev->dev.of_node;
> + const struct of_device_id *of_id =
> + of_match_device(udc_pxa_dt_ids, &pdev->dev);
> + int ret;
> + u32 gpio_pullup;
> +
> + if (!np || !of_id)
> + return 1;
> + ret = of_alias_get_id(np, "udc");
> + pdev->id = (ret >= 0) ? ret : -1;
The alias name wasn't mentioned in the binding...
> +
> + if (!of_property_read_u32(np, "udc-pullup-gpio", &gpio_pullup))
> + udc->gpio_pullup = gpio_pullup;
This number is a Linux internal detail. Use the GPIO bindings.
> + udc->gpio_pullup_inverted =
> + of_property_read_bool(np, "udc-pullup-gpio-inverted");
The GPIO bindings can describe this.
> @@ -2415,7 +2469,13 @@ static int pxa_udc_probe(struct platform_device *pdev)
> {
> struct resource *regs;
> struct pxa_udc *udc = &memory;
> - int retval = 0, gpio;
> + int retval = 0;
> +
> + retval = pxa_udc_probe_dt(pdev, udc);
> + if (retval < 0)
> + return retval;
This case can never happen given the prototype of pxa_udc_probe_dt.
> @@ -2446,6 +2504,9 @@ static int pxa_udc_probe(struct platform_device *pdev)
> retval = PTR_ERR(udc->clk);
> goto err_clk;
> }
> + retval = clk_prepare(udc->clk);
> + if (retval)
> + goto err_clk_prepare;
>
> retval = -ENOMEM;
> udc->regs = ioremap(regs->start, resource_size(regs));
> @@ -2483,9 +2544,13 @@ err_add_udc:
> err_irq:
> iounmap(udc->regs);
> err_map:
> + clk_unprepare(udc->clk);
> +err_clk_prepare:
> clk_put(udc->clk);
> udc->clk = NULL;
> err_clk:
> + if (gpio_is_valid(udc->gpio_pullup))
> + gpio_free(udc->gpio_pullup);
> return retval;
> }
>
> @@ -2509,6 +2574,7 @@ static int pxa_udc_remove(struct platform_device *_dev)
>
> udc->transceiver = NULL;
> the_controller = NULL;
> + clk_unprepare(udc->clk);
> clk_put(udc->clk);
I don't see why these clock changes should be in the same patch as the
DT support. They might be a prerequisite, but as far as I can tell they
are required even without DT probing.
Mark.
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