linux-kernel - Re: [PATCH v7 02/12] mfd: omap-usb-host: Get clocks based on hardware revision

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Date:	Fri, 14 Feb 2014 10:07:01 +0000
From:	Lee Jones <lee.jones@...aro.org>
To:	Roger Quadros <rogerq@...com>
Cc:	tony@...mide.com, bcousson@...libre.com, balbi@...com, nm@...com,
	khilman@...aro.org, linux-omap@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org, linux-usb@...r.kernel.org,
	Samuel Ortiz <sameo@...ux.intel.com>
Subject: Re: [PATCH v7 02/12] mfd: omap-usb-host: Get clocks based on
 hardware revision

> Not all revisions have all the clocks so get the necessary clocks
> based on hardware revision.
> 
> This should avoid un-necessary clk_get failure messages that were
> observed earlier.
> 
> Be more strict and always fail on clk_get() error.

It might have been clearer if you'd broken these two pieces of
functionality changes into two different patches. In future it would
be preferred.

> CC: Lee Jones <lee.jones@...aro.org>
> CC: Samuel Ortiz <sameo@...ux.intel.com>
> Signed-off-by: Roger Quadros <rogerq@...com>
> ---
>  drivers/mfd/omap-usb-host.c | 92 +++++++++++++++++++++++++++++++--------------
>  1 file changed, 64 insertions(+), 28 deletions(-)
> 
> diff --git a/drivers/mfd/omap-usb-host.c b/drivers/mfd/omap-usb-host.c
> index 0c3c9a0..60a3bed 100644
> --- a/drivers/mfd/omap-usb-host.c
> +++ b/drivers/mfd/omap-usb-host.c
> @@ -665,22 +665,41 @@ static int usbhs_omap_probe(struct platform_device *pdev)
>  		goto err_mem;
>  	}
>  
> -	need_logic_fck = false;
> +	/* Set all clocks as invalid to begin with */
> +	omap->ehci_logic_fck = omap->init_60m_fclk = ERR_PTR(-ENODEV);
> +	omap->utmi_p1_gfclk = omap->utmi_p2_gfclk = ERR_PTR(-ENODEV);
> +	omap->xclk60mhsp1_ck = omap->xclk60mhsp2_ck = ERR_PTR(-ENODEV);
> +

For readability you should probably do these one per line.

>  	for (i = 0; i < omap->nports; i++) {
> -		if (is_ehci_phy_mode(i) || is_ehci_tll_mode(i) ||
> -			is_ehci_hsic_mode(i))
> -				need_logic_fck |= true;
> +		omap->utmi_clk[i] = ERR_PTR(-ENODEV);
> +		omap->hsic480m_clk[i] = ERR_PTR(-ENODEV);
> +		omap->hsic60m_clk[i] = ERR_PTR(-ENODEV);
>  	}
>  
> -	omap->ehci_logic_fck = ERR_PTR(-EINVAL);
> -	if (need_logic_fck) {
> -		omap->ehci_logic_fck = devm_clk_get(dev, "ehci_logic_fck");

Has this clock been renamed, or is it no longer required?

Perhaps you should be explicit in the commit log as to which clocks
you're removing.

> -		if (IS_ERR(omap->ehci_logic_fck)) {
> -			ret = PTR_ERR(omap->ehci_logic_fck);
> -			dev_dbg(dev, "ehci_logic_fck failed:%d\n", ret);
> +	/* for OMAP3 i.e. USBHS REV1 */
> +	if (omap->usbhs_rev == OMAP_USBHS_REV1) {
> +		need_logic_fck = false;
> +		for (i = 0; i < omap->nports; i++) {
> +			if (is_ehci_phy_mode(pdata->port_mode[i]) ||
> +			    is_ehci_tll_mode(pdata->port_mode[i]) ||
> +			    is_ehci_hsic_mode(pdata->port_mode[i]))
> +
> +				need_logic_fck |= true;
> +		}
> +
> +		if (need_logic_fck) {
> +			omap->ehci_logic_fck = clk_get(dev, "usbhost_120m_fck");

devm_clk_get()?

<snip>

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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