[U-Boot] [PATCH v2] usb: add clock support for generic EHCI

[Marek Vasut <marex@denx.de>]

On Monday, January 25, 2016 at 05:59:30 AM, Masahiro Yamada wrote:
> This driver is designed in a generic manner, so clocks should be
> handled genericly as well.
> 
> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
> ---
> 
> Changes in v2:
>   - rephrase git-log
>   - rebase on commit 12f229ea
>   - do not store clk devices and IDs in the private data
> 
>  drivers/usb/host/ehci-generic.c | 15 +++++++++++++++
>  1 file changed, 15 insertions(+)
> 
> diff --git a/drivers/usb/host/ehci-generic.c
> b/drivers/usb/host/ehci-generic.c index 1292caa..98f9db7 100644
> --- a/drivers/usb/host/ehci-generic.c
> +++ b/drivers/usb/host/ehci-generic.c
> @@ -5,6 +5,7 @@
>   */
> 
>  #include <common.h>
> +#include <clk.h>
>  #include <dm.h>
>  #include "ehci.h"
> 
> @@ -21,6 +22,20 @@ static int ehci_usb_probe(struct udevice *dev)
>  {
>  	struct ehci_hccr *hccr = (struct ehci_hccr *)dev_get_addr(dev);
>  	struct ehci_hcor *hcor;
> +	int i = 0;
> +
> +	while (1) {

You can do for (i = 0; ; i++) {} here ;-)

> +		struct udevice *clk_dev;
> +		int clk_id;
> +
> +		clk_id = clk_get_by_index(dev, i, &clk_dev);
> +		if (clk_id < 0)
> +			break;
> +		if (clk_enable(clk_dev, clk_id))
> +			printf("failed to enable clock (dev=%s, id=%d)\n",
> +			       clk_dev->name, clk_id);
> +		i++;
> +	}
> 
>  	hcor = (struct ehci_hcor *)((uintptr_t)hccr +
>  				    HC_LENGTH(ehci_readl(&hccr->cr_capbase)));

What about disabling the clock? Is it doable with the current clock framework
or shall we abandon it for now ?

Best regards,
Marek Vasut