On Thu, Jul 12, 2012 at 03:01:52PM +0800, Richard Zhao wrote:
> i.MX usb controllers shares non-core registers, which may include
> SoC specific controls. We take it as a usbmisc device and usbmisc
> driver export functions needed by ci13xxx_imx driver.
>
> For example, Sabrelite board has bad over-current design, we can
> usbmisc to disable over-current detect.
>
> Signed-off-by: Richard Zhao <richard.z...@freescale.com>
> ---
> .../devicetree/bindings/usb/imx-usbmisc.txt | 15 ++
> drivers/usb/chipidea/Makefile | 2 +-
> drivers/usb/chipidea/ci13xxx_imx.c | 4 +
> drivers/usb/chipidea/imx_usbmisc.c | 144
> ++++++++++++++++++++
> 4 files changed, 164 insertions(+), 1 deletion(-)
> create mode 100644 Documentation/devicetree/bindings/usb/imx-usbmisc.txt
> create mode 100644 drivers/usb/chipidea/imx_usbmisc.c
>
> diff --git a/Documentation/devicetree/bindings/usb/imx-usbmisc.txt
> b/Documentation/devicetree/bindings/usb/imx-usbmisc.txt
> new file mode 100644
> index 0000000..09f01ca
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/usb/imx-usbmisc.txt
> @@ -0,0 +1,15 @@
> +* Freescale i.MX non-core registers
> +
> +Required properties:
> +- compatible: Should be "fsl,imx6q-usbmisc"
> +- reg: Should contain registers location and length
> +
> +Optional properties:
> +- fsl,disable-over-current: disable over current detect
> +
> +Examples:
> +usbmisc@02184800 {
> + compatible = "fsl,imx6q-usbmisc";
> + reg = <0x02184800 0x200>;
> + fsl,disable-over-current;
> +};
> diff --git a/drivers/usb/chipidea/Makefile b/drivers/usb/chipidea/Makefile
> index 3f56b76..46fc31c 100644
> --- a/drivers/usb/chipidea/Makefile
> +++ b/drivers/usb/chipidea/Makefile
> @@ -17,5 +17,5 @@ ifneq ($(CONFIG_PCI),)
> endif
>
> ifneq ($(CONFIG_OF_DEVICE),)
> - obj-$(CONFIG_USB_CHIPIDEA) += ci13xxx_imx.o
> + obj-$(CONFIG_USB_CHIPIDEA) += ci13xxx_imx.o imx_usbmisc.o
> endif
> diff --git a/drivers/usb/chipidea/ci13xxx_imx.c
> b/drivers/usb/chipidea/ci13xxx_imx.c
> index b3173d8..dd7f3a3 100644
> --- a/drivers/usb/chipidea/ci13xxx_imx.c
> +++ b/drivers/usb/chipidea/ci13xxx_imx.c
> @@ -24,6 +24,8 @@
>
> #include "ci.h"
>
> +int imx_usbmisc_init(struct device *usbdev);
> +
> #define pdev_to_phy(pdev) \
> ((struct usb_phy *)platform_get_drvdata(pdev))
> #define ci_to_imx_data(ci) \
> @@ -142,6 +144,8 @@ static int __devinit ci13xxx_imx_probe(struct
> platform_device *pdev)
> dma_set_coherent_mask(&pdev->dev, *pdev->dev.dma_mask);
> }
>
> + imx_usbmisc_init(&pdev->dev);
> +
> platform_set_drvdata(pdev, data);
>
> plat_ci = ci13xxx_add_device(&pdev->dev,
> diff --git a/drivers/usb/chipidea/imx_usbmisc.c
> b/drivers/usb/chipidea/imx_usbmisc.c
> new file mode 100644
> index 0000000..33a8ec0
> --- /dev/null
> +++ b/drivers/usb/chipidea/imx_usbmisc.c
> @@ -0,0 +1,144 @@
> +/*
> + * Copyright 2012 Freescale Semiconductor, Inc.
> + *
> + * The code contained herein is licensed under the GNU General Public
> + * License. You may obtain a copy of the GNU General Public License
> + * Version 2 or later at the following locations:
> + *
> + * http://www.opensource.org/licenses/gpl-license.html
> + * http://www.gnu.org/copyleft/gpl.html
> + */
> +
> +#include <linux/module.h>
> +#include <linux/of_platform.h>
> +#include <linux/clk.h>
> +#include <linux/err.h>
> +#include <asm/io.h>
linux/io.h
> +
> +struct usbmisc;
> +
> +struct soc_data {
> + int (*init) (struct usbmisc *usbmisc, int id);
> + void (*exit) (struct usbmisc *usbmisc, int id);
> +};
> +
> +struct usbmisc {
> + struct soc_data *soc_data;
> + void __iomem *base;
> + struct clk *clk;
> +
> + int dis_oc:1;
> +};
> +
> +/* Since we only have one usbmisc device at runtime, we global variables */
> +static struct usbmisc *usbmisc;
NACK
What you've done here exactly matches your current usecase but is not
enough for any of the other usecases I can think of. Even the i.MX6 has
three USB ports, each of them has a overcurrent disable bit. Also, there
are more flags, like:
- use internal phy
- power pin polarity
- ttl enabled
I think the best you can do here is to add the flags to the
fsl,imx6q-usb device nodes:
usb@02184000 { /* USB OTG */
compatible = "fsl,imx6q-usb", "fsl,imx27-usb";
reg = <0x02184000 0x200>;
interrupts = <0 43 0x04>;
fsl,usbphy = <&usbphy1>;
status = "disabled";
fsl,disable-over-current;
<other flags>;
};
Then add a usbmisc device which does not contain any flags. During
initialization of the fsl,imx6q-usb device you can then pass a pointer
to its device node to imx_usbmisc_init.
Sascha
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