[PATCH] drivers/ptp/Kconfig: add "depends on HAS_IOMEM" for 'PTP_1588_CLOCK_PCH'

[Chen Gang <gang.chen@asianux.com>]

The related driver need depend on HAS_IOMEM, or may be built under UML
architecture.

The related error (with allmodconfig, without pcap):

    CC [M]  drivers/ptp/ptp_pch.o
  drivers/ptp/ptp_pch.c: In function ‘pch_remove’:
  drivers/ptp/ptp_pch.c:571:3: error: implicit declaration of function ‘iounmap’ [-Werror=implicit-function-declaration]
  drivers/ptp/ptp_pch.c: In function ‘pch_probe’:
  drivers/ptp/ptp_pch.c:621:2: error: implicit declaration of function ‘ioremap’ [-Werror=implicit-function-declaration]
  drivers/ptp/ptp_pch.c:621:13: warning: assignment makes pointer from integer without a cast [enabled by default]
  cc1: some warnings being treated as errors

Signed-off-by: Chen Gang <gang.chen@asianux.com>
---
 drivers/ptp/Kconfig |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/drivers/ptp/Kconfig b/drivers/ptp/Kconfig
index 5be73ba..5a7910e 100644
--- a/drivers/ptp/Kconfig
+++ b/drivers/ptp/Kconfig
@@ -73,6 +73,7 @@ config DP83640_PHY
 config PTP_1588_CLOCK_PCH
 	tristate "Intel PCH EG20T as PTP clock"
 	depends on X86 || COMPILE_TEST
+	depends on HAS_IOMEM
 	select PTP_1588_CLOCK
 	help
 	  This driver adds support for using the PCH EG20T as a PTP
-- 
1.7.7.6