From owner-svn-src-all@freebsd.org  Sat Apr  1 22:29:12 2017
Return-Path: <owner-svn-src-all@freebsd.org>
Delivered-To: svn-src-all@mailman.ysv.freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 by mailman.ysv.freebsd.org (Postfix) with ESMTP id 763A0D297D3;
 Sat,  1 Apr 2017 22:29:12 +0000 (UTC)
 (envelope-from jhibbits@FreeBSD.org)
Received: from repo.freebsd.org (repo.freebsd.org
 [IPv6:2610:1c1:1:6068::e6a:0])
 (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
 (Client did not present a certificate)
 by mx1.freebsd.org (Postfix) with ESMTPS id 482BE31;
 Sat,  1 Apr 2017 22:29:12 +0000 (UTC)
 (envelope-from jhibbits@FreeBSD.org)
Received: from repo.freebsd.org ([127.0.1.37])
 by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id v31MTBLb012690;
 Sat, 1 Apr 2017 22:29:11 GMT (envelope-from jhibbits@FreeBSD.org)
Received: (from jhibbits@localhost)
 by repo.freebsd.org (8.15.2/8.15.2/Submit) id v31MTBDU012688;
 Sat, 1 Apr 2017 22:29:11 GMT (envelope-from jhibbits@FreeBSD.org)
Message-Id: <201704012229.v31MTBDU012688@repo.freebsd.org>
X-Authentication-Warning: repo.freebsd.org: jhibbits set sender to
 jhibbits@FreeBSD.org using -f
From: Justin Hibbits <jhibbits@FreeBSD.org>
Date: Sat, 1 Apr 2017 22:29:11 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
 svn-src-head@freebsd.org
Subject: svn commit: r316378 - head/sys/powerpc/mpc85xx
X-SVN-Group: head
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
X-BeenThere: svn-src-all@freebsd.org
X-Mailman-Version: 2.1.23
Precedence: list
List-Id: "SVN commit messages for the entire src tree \(except for &quot;
 user&quot; and &quot; projects&quot; \)" <svn-src-all.freebsd.org>
List-Unsubscribe: <https://lists.freebsd.org/mailman/options/svn-src-all>,
 <mailto:svn-src-all-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/svn-src-all/>
List-Post: <mailto:svn-src-all@freebsd.org>
List-Help: <mailto:svn-src-all-request@freebsd.org?subject=help>
List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/svn-src-all>,
 <mailto:svn-src-all-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sat, 01 Apr 2017 22:29:12 -0000

Author: jhibbits
Date: Sat Apr  1 22:29:11 2017
New Revision: 316378
URL: https://svnweb.freebsd.org/changeset/base/316378

Log:
  Add a helper function to get system reference clock
  
  Many devices are clocked from the SoC's platform clock / 2.  Some device nodes
  include their own clock-frequency property, while others are dependent on the
  SoC's bus-frequency property instead.  To simplify, add a helper function to get
  this clock.

Modified:
  head/sys/powerpc/mpc85xx/mpc85xx.c
  head/sys/powerpc/mpc85xx/mpc85xx.h

Modified: head/sys/powerpc/mpc85xx/mpc85xx.c
==============================================================================
--- head/sys/powerpc/mpc85xx/mpc85xx.c	Sat Apr  1 22:03:00 2017	(r316377)
+++ head/sys/powerpc/mpc85xx/mpc85xx.c	Sat Apr  1 22:29:11 2017	(r316378)
@@ -436,3 +436,18 @@ mpc85xx_fix_errata(vm_offset_t va_ccsr)
 err:
 	return;
 }
+
+uint32_t
+mpc85xx_get_system_clock(void)
+{
+	phandle_t soc;
+	uint32_t freq;
+
+	soc = OF_finddevice("/soc");
+	freq = 0;
+
+	/* freq isn't modified on error. */
+	OF_getencprop(soc, "bus-frequency", (void *)&freq, sizeof(freq));
+
+	return (freq / 2);
+}

Modified: head/sys/powerpc/mpc85xx/mpc85xx.h
==============================================================================
--- head/sys/powerpc/mpc85xx/mpc85xx.h	Sat Apr  1 22:03:00 2017	(r316377)
+++ head/sys/powerpc/mpc85xx/mpc85xx.h	Sat Apr  1 22:29:11 2017	(r316378)
@@ -171,5 +171,6 @@ void mpc85xx_enable_l3_cache(void);
 void mpc85xx_fix_errata(vm_offset_t);
 void dataloss_erratum_access(vm_offset_t, uint32_t);
 int mpc85xx_is_qoriq(void);
+uint32_t mpc85xx_get_system_clock(void);
 
 #endif /* _MPC85XX_H_ */