linux-kernel - HAVE_CLK (for <linux/clk.h> support)

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Date:	Tue, 27 May 2008 16:14:55 -0700
From:	David Brownell <david-b@...bell.net>
To:	Felipe Balbi <felipe.balbi@...ia.com>
Cc:	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: HAVE_CLK (for <linux/clk.h> support)

On Tuesday 27 May 2008, Felipe Balbi wrote:
> This patch adds support for MUSB and TUSB controllers
> integrated into omap2430 and davinci. It also adds support
> for external tusb6010 controller.

The most significant issue I know of with this patch [0] is actually
an arch issue.  On ones like x86, with no support for the clock API,
this driver will build but not link:

ERROR: "clk_enable" [drivers/usb/musb/musb_hdrc.ko] undefined!
ERROR: "clk_disable" [drivers/usb/musb/musb_hdrc.ko] undefined!
ERROR: "clk_put" [drivers/usb/musb/musb_hdrc.ko] undefined!
ERROR: "clk_get" [drivers/usb/musb/musb_hdrc.ko] undefined!

I don't know of any other drivers with this particular issue,
but nonetheless ... I think the following is an appropriate
resolution.

Comments from anyone else?

- Dave

[0] Posted this AM on linux-usb but evidently too big for any
    of the archives I know about ... 450 KB, which includes
    host, gadget, and OTG functionality.  Previous versions
    are archived, in the one-file-added-per-patch style.


--- g26.orig/drivers/usb/musb/Kconfig	2008-05-27 16:02:41.000000000 -0700
+++ g26/drivers/usb/musb/Kconfig	2008-05-27 16:01:09.000000000 -0700
@@ -8,7 +8,7 @@ comment "Enable Host or Gadget support t
 
 # (M)HDRC = (Multipoint) Highspeed Dual-Role Controller
 config USB_MUSB_HDRC
-	depends on USB || USB_GADGET
+	depends on HAVE_CLK && (USB || USB_GADGET)
 	select TWL4030_USB if MACH_OMAP_3430SDP
 	tristate 'Inventra Highspeed Dual Role Controller (TI, ...)'
 	help
--- g26.orig/arch/Kconfig	2008-05-27 16:00:14.000000000 -0700
+++ g26/arch/Kconfig	2008-05-27 16:00:41.000000000 -0700
@@ -39,3 +39,6 @@ config HAVE_KRETPROBES
 
 config HAVE_DMA_ATTRS
 	def_bool n
+
+config HAVE_CLK
+	def_bool n
--- g26.orig/arch/arm/Kconfig	2008-05-27 16:01:15.000000000 -0700
+++ g26/arch/arm/Kconfig	2008-05-27 16:02:33.000000000 -0700
@@ -458,12 +458,14 @@ config ARCH_DAVINCI
 	select GENERIC_TIME
 	select GENERIC_CLOCKEVENTS
 	select GENERIC_GPIO
+	select HAVE_CLK
 	help
 	  Support for TI's DaVinci platform.
 
 config ARCH_OMAP
 	bool "TI OMAP"
 	select GENERIC_GPIO
+	select HAVE_CLK
 	select HAVE_GPIO_LIB
 	select GENERIC_TIME
 	select GENERIC_CLOCKEVENTS
--
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