linux-kernel - Re: [PATCH 4/5] usb: ohci-da8xx: Remove clock code that references mach

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Date:	Wed, 16 Mar 2016 10:50:11 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	David Lechner <david@...hnology.com>
cc:	Sekhar Nori <nsekhar@...com>, Kevin Hilman <khilman@...nel.org>,
	Bin Liu <b-liu@...com>, Petr Kulhavy <petr@...ix.com>,
	Russell King <linux@....linux.org.uk>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	Felipe Balbi <balbi@...nel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <linux-usb@...r.kernel.org>
Subject: Re: [PATCH 4/5] usb: ohci-da8xx: Remove clock code that references
 mach

On Tue, 15 Mar 2016, David Lechner wrote:

> Including mach/* is frowned upon in device drivers, so get rid of it.
> 
> This replaces usb20_clk with usb11_phy_clk that represents the 48MHz usb
> phy clock. The interaction with the usb20 (musb) subsystem does no belong
> here and has been implemented in da830.c/da850.c with the rest of the
> da8xx clock code.
> 
> Signed-off-by: David Lechner <david@...hnology.com>
> ---
>  drivers/usb/host/ohci-da8xx.c | 81 ++++++++++++++++++++-----------------------
>  1 file changed, 38 insertions(+), 43 deletions(-)
> 
> diff --git a/drivers/usb/host/ohci-da8xx.c b/drivers/usb/host/ohci-da8xx.c
> index e5c33bc..37fa3fb 100644
> --- a/drivers/usb/host/ohci-da8xx.c
> +++ b/drivers/usb/host/ohci-da8xx.c
> @@ -16,57 +16,43 @@
>  #include <linux/platform_device.h>
>  #include <linux/clk.h>
>  
> -#include <mach/da8xx.h>
>  #include <linux/platform_data/usb-davinci.h>
>  
>  #ifndef CONFIG_ARCH_DAVINCI_DA8XX
>  #error "This file is DA8xx bus glue.  Define CONFIG_ARCH_DAVINCI_DA8XX."
>  #endif
>  
> -#define CFGCHIP2	DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG)
> +#define USB1SUSPENDM	(1 << 7)
>  
>  static struct clk *usb11_clk;
> -static struct clk *usb20_clk;
> +static struct clk *usb11_phy_clk;
> +static __iomem u32 *cfgchip2;

Is it theoretically impossible for a da8xx platform to have more than
one OHCI controller?

If it isn't, you better not use static variables to hold per-device 
data.

Alan Stern