CVS commit: src/sys/dev/clk

[Manuel Bouyer]

Module Name:    src
Committed By:   bouyer
Date:           Sun Apr  1 21:11:01 UTC 2018

Modified Files:
        src/sys/dev/clk: clk.c clk.h clk_backend.h

Log Message:
As discussed on tech-kern@ 10 days ago, add a clk_round_rate() method,
which returns the rate that would be used by this clock if clk_set_rate()
was called. Used by drivers (or other clocks) which have their own divider
and need to know the parent's clock capabilities to compute the best
parameters.


To generate a diff of this commit:
cvs rdiff -u -r1.2 -r1.3 src/sys/dev/clk/clk.c src/sys/dev/clk/clk.h \
    src/sys/dev/clk/clk_backend.h

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.


Modified files:

Index: src/sys/dev/clk/clk.c
diff -u src/sys/dev/clk/clk.c:1.2 src/sys/dev/clk/clk.c:1.3
--- src/sys/dev/clk/clk.c:1.2	Sun Apr 16 12:28:21 2017
+++ src/sys/dev/clk/clk.c	Sun Apr  1 21:11:01 2018
@@ -1,4 +1,4 @@
-/* $NetBSD: clk.c,v 1.2 2017/04/16 12:28:21 jmcneill Exp $ */
+/* $NetBSD: clk.c,v 1.3 2018/04/01 21:11:01 bouyer Exp $ */
 
 /*-
  * Copyright (c) 2015 Jared D. McNeill <jmcne...@invisible.ca>
@@ -27,7 +27,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: clk.c,v 1.2 2017/04/16 12:28:21 jmcneill Exp $");
+__KERNEL_RCSID(0, "$NetBSD: clk.c,v 1.3 2018/04/01 21:11:01 bouyer Exp $");
 
 #include <sys/param.h>
 
@@ -65,6 +65,16 @@ clk_set_rate(struct clk *clk, u_int rate
 	}
 }
 
+u_int
+clk_round_rate(struct clk *clk, u_int rate)
+{
+	if (clk->domain->funcs->round_rate) {
+		return clk->domain->funcs->round_rate(clk->domain->priv,
+		    clk, rate);
+	}
+	return 0;
+}
+
 int
 clk_enable(struct clk *clk)
 {
Index: src/sys/dev/clk/clk.h
diff -u src/sys/dev/clk/clk.h:1.2 src/sys/dev/clk/clk.h:1.3
--- src/sys/dev/clk/clk.h:1.2	Sun Apr 16 12:28:21 2017
+++ src/sys/dev/clk/clk.h	Sun Apr  1 21:11:01 2018
@@ -1,4 +1,4 @@
-/* $NetBSD: clk.h,v 1.2 2017/04/16 12:28:21 jmcneill Exp $ */
+/* $NetBSD: clk.h,v 1.3 2018/04/01 21:11:01 bouyer Exp $ */
 
 /*-
  * Copyright (c) 2015 Jared D. McNeill <jmcne...@invisible.ca>
@@ -36,6 +36,7 @@ struct clk *	clk_get(struct clk_domain *
 void		clk_put(struct clk *);
 u_int		clk_get_rate(struct clk *);
 int		clk_set_rate(struct clk *, u_int);
+u_int		clk_round_rate(struct clk *, u_int);
 int		clk_enable(struct clk *);
 int		clk_disable(struct clk *);
 int		clk_set_parent(struct clk *, struct clk *);
Index: src/sys/dev/clk/clk_backend.h
diff -u src/sys/dev/clk/clk_backend.h:1.2 src/sys/dev/clk/clk_backend.h:1.3
--- src/sys/dev/clk/clk_backend.h:1.2	Sun Apr 16 12:28:21 2017
+++ src/sys/dev/clk/clk_backend.h	Sun Apr  1 21:11:01 2018
@@ -1,4 +1,4 @@
-/* $NetBSD: clk_backend.h,v 1.2 2017/04/16 12:28:21 jmcneill Exp $ */
+/* $NetBSD: clk_backend.h,v 1.3 2018/04/01 21:11:01 bouyer Exp $ */
 
 /*-
  * Copyright (c) 2015 Jared D. McNeill <jmcne...@invisible.ca>
@@ -49,6 +49,7 @@ struct clk_funcs {
 
 	u_int (*get_rate)(void *, struct clk *);
 	int (*set_rate)(void *, struct clk *, u_int);
+	u_int (*round_rate)(void *, struct clk *, u_int);
 	int (*enable)(void *, struct clk *);
 	int (*disable)(void *, struct clk *);
 	int (*set_parent)(void *, struct clk *, struct clk *);