[U-Boot] [PATCH v7 08/10] usb: host: ohci-generic: add CLOCK support

["Lothar Waßmann" <LW@KARO-electronics.de>]

Hi,

On Tue, 20 Jun 2017 11:59:09 +0200 patrice.chotard at st.com wrote:
> From: Patrice Chotard <patrice.chotard@st.com>
> 
> use array to save enabled clocks reference in order to
> disabled them in case of error during probe() or during
> driver removal.
> 
> Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
> ---
> v7:	_ replace clk_count() by ofnode_count_phandle_with_args()
> 
> v6:	_ none
> 
> v5:	_ none
> 
> v4:	_ use generic_phy_valid() before generic_phy_exit() call
> 
> v3:	_ extract in this patch the CLOCK support add-on from previous patch 5
> 	_ keep enabled clocks reference in list in order to
> 	  disable clocks in error path or in .remove callback
> 
> v2:	_ add error path management
> 	_ add .remove callback
> 
>  drivers/usb/host/ohci-generic.c | 59 +++++++++++++++++++++++++++++++++++++++--
>  1 file changed, 57 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/usb/host/ohci-generic.c b/drivers/usb/host/ohci-generic.c
> index f85738f..f76a1c2 100644
> --- a/drivers/usb/host/ohci-generic.c
> +++ b/drivers/usb/host/ohci-generic.c
> @@ -5,27 +5,83 @@
>   */
>  
>  #include <common.h>
> +#include <clk.h>
>  #include <dm.h>
>  #include "ohci.h"
>  
> +#include <dm/ofnode.h>
> +
>  #if !defined(CONFIG_USB_OHCI_NEW)
>  # error "Generic OHCI driver requires CONFIG_USB_OHCI_NEW"
>  #endif
>  
>  struct generic_ohci {
>  	ohci_t ohci;
> +	struct clk *clocks;
> +	int clock_count;
>  };
>  
>  static int ohci_usb_probe(struct udevice *dev)
>  {
>  	struct ohci_regs *regs = (struct ohci_regs *)devfdt_get_addr(dev);
> +	struct generic_ohci *priv = dev_get_priv(dev);
> +	int i, err, ret, clock_nb;
> +
> +	err = 0;
> +	priv->clock_count = 0;
> +	clock_nb = ofnode_count_phandle_with_args(dev_ofnode(dev), "clocks",
> +						  "#clock-cells");
> +	if (clock_nb > 0) {
> +		priv->clocks = devm_kmalloc(dev, sizeof(struct clk) * clock_nb,
> +					    GFP_KERNEL);
> +		if (!priv->clocks) {
> +			error("Can't allocate resource\n");
> +			return -ENOMEM;
> +		}
> +
> +		for (i = 0; i < clock_nb; i++) {
> +			err = clk_get_by_index(dev, i, &priv->clocks[i]);
> +			if (err < 0)
> +				break;
> +
> +			priv->clock_count++;
> +
> +			if (clk_enable(&priv->clocks[i])) {
> +				error("failed to enable clock %d\n", i);
> +				clk_free(&priv->clocks[i]);
> +				goto clk_err;
> +			}
> +			clk_free(&priv->clocks[i]);
>
You free the freshly allocated clock right away and use it lateron?

> +	} else {
> +		if (clock_nb != -ENOENT) {
> +			error("failed to get clock phandle(%d)\n", clock_nb);
> +			return clock_nb;
> +		}
> +	}
>  
> -	return ohci_register(dev, regs);
> +	err = ohci_register(dev, regs);
> +	if (!err)
> +		return err;
> +
	if (err)
		goto clk_err;
	return 0;
would be more easy to follow.

> +clk_err:
> +	ret = clk_disable_all(priv->clocks, priv->clock_count);
> +	if (ret)
> +		return ret;
> +
> +	return err;
>  }
>  
>  static int ohci_usb_remove(struct udevice *dev)
>  {
> -	return ohci_deregister(dev);
> +	struct generic_ohci *priv = dev_get_priv(dev);
> +	int ret;
> +
> +	ret = ohci_deregister(dev);
> +	if (ret)
> +		return ret;
> +
> +	return clk_disable_all(priv->clocks, priv->clock_count);
>  }
>  
>  static const struct udevice_id ohci_usb_ids[] = {


Lothar Waßmann