[PATCH 1/8] fsl_mx3_udc: Add i.MX35 support

[g.liakhovetski@gmx.de (Guennadi Liakhovetski)]

(added usb to cc)

On Thu, 4 Feb 2010, Sascha Hauer wrote:

> The i.MX35 works fine with this driver, but we do not have
> the usb_ahb clock.
> 
> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
> Cc: Guennadi Liakhovetski <g.liakhovetski@gmx.de>

Sorry for a delay...

> ---
>  drivers/usb/gadget/fsl_mx3_udc.c |   31 ++++++++++++++++++++-----------
>  1 files changed, 20 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/usb/gadget/fsl_mx3_udc.c b/drivers/usb/gadget/fsl_mx3_udc.c
> index 4bc2bf3..20a802e 100644
> --- a/drivers/usb/gadget/fsl_mx3_udc.c
> +++ b/drivers/usb/gadget/fsl_mx3_udc.c
> @@ -17,6 +17,8 @@
>  #include <linux/fsl_devices.h>
>  #include <linux/platform_device.h>
>  
> +#include <mach/hardware.h>
> +
>  static struct clk *mxc_ahb_clk;
>  static struct clk *mxc_usb_clk;
>  
> @@ -28,14 +30,16 @@ int fsl_udc_clk_init(struct platform_device *pdev)
>  
>  	pdata = pdev->dev.platform_data;
>  
> -	mxc_ahb_clk = clk_get(&pdev->dev, "usb_ahb");
> -	if (IS_ERR(mxc_ahb_clk))
> -		return PTR_ERR(mxc_ahb_clk);
> +	if (!cpu_is_mx35()) {
> +		mxc_ahb_clk = clk_get(&pdev->dev, "usb_ahb");
> +		if (IS_ERR(mxc_ahb_clk))
> +			return PTR_ERR(mxc_ahb_clk);
>  
> -	ret = clk_enable(mxc_ahb_clk);
> -	if (ret < 0) {
> -		dev_err(&pdev->dev, "clk_enable(\"usb_ahb\") failed\n");
> -		goto eenahb;
> +		ret = clk_enable(mxc_ahb_clk);
> +		if (ret < 0) {
> +			dev_err(&pdev->dev, "clk_enable(\"usb_ahb\") failed\n");
> +			goto eenahb;
> +		}
>  	}
>  
>  	/* make sure USB_CLK is running at 60 MHz +/- 1000 Hz */
> @@ -50,6 +54,7 @@ int fsl_udc_clk_init(struct platform_device *pdev)
>  	if (pdata->phy_mode != FSL_USB2_PHY_ULPI &&
>  	    (freq < 59999000 || freq > 60001000)) {
>  		dev_err(&pdev->dev, "USB_CLK=%lu, should be 60MHz\n", freq);
> +		ret = -EINVAL;
>  		goto eclkrate;
>  	}
>  
> @@ -66,9 +71,11 @@ eclkrate:
>  	clk_put(mxc_usb_clk);
>  	mxc_usb_clk = NULL;
>  egusb:
> -	clk_disable(mxc_ahb_clk);
> +	if (!cpu_is_mx35())
> +		clk_disable(mxc_ahb_clk);
>  eenahb:
> -	clk_put(mxc_ahb_clk);
> +	if (!cpu_is_mx35())
> +		clk_put(mxc_ahb_clk);
>  	return ret;
>  }
>  

You could do

egusb:
	if (!cpu_is_mx35()) {
		clk_disable(mxc_ahb_clk);
eenahb:
		clk_put(mxc_ahb_clk);
	}

here, which (arguably) looks a bit better, but that's not anything 
critical, I think. Otherwise

Acked-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>

> @@ -90,6 +97,8 @@ void fsl_udc_clk_release(void)
>  		clk_disable(mxc_usb_clk);
>  		clk_put(mxc_usb_clk);
>  	}
> -	clk_disable(mxc_ahb_clk);
> -	clk_put(mxc_ahb_clk);
> +	if (!cpu_is_mx35()) {
> +		clk_disable(mxc_ahb_clk);
> +		clk_put(mxc_ahb_clk);
> +	}
>  }
> -- 
> 1.6.6
> 

Thanks
Guennadi
---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/