ARM: shmobile: sh73a0: add a TWD clock

Add a TWD clock on sh73a0 for the smp_twd driver to properly update the
clock's frequency upon cpufreq events.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

1 files changed, 16 insertions, 0 deletions

diff --git a/arch/arm/mach-shmobile/clock-sh73a0.c b/arch/arm/mach-shmobile/clock-sh73a0.c
index 34b5c5ae4cbd..a57ec151674e 100644
--- a/arch/arm/mach-shmobile/clock-sh73a0.c
+++ b/arch/arm/mach-shmobile/clock-sh73a0.c
@@ -288,6 +288,20 @@ static struct clk div4_clks[DIV4_NR] = {
         [DIV4_HP] = DIV4(FRQCRB, 4, 0xdff, 0),
 };
 
+static unsigned long twd_recalc(struct clk *clk)
+{
+        return clk_get_rate(clk->parent) / 4;
+}
+
+static struct sh_clk_ops twd_clk_ops = {
+        .recalc = twd_recalc,
+};
+
+static struct clk twd_clk = {
+        .parent = &div4_clks[DIV4_Z],
+        .ops = &twd_clk_ops,
+};
+
 enum { DIV6_VCK1, DIV6_VCK2, DIV6_VCK3, DIV6_ZB1,
         DIV6_FLCTL, DIV6_SDHI0, DIV6_SDHI1, DIV6_SDHI2,
         DIV6_FSIA, DIV6_FSIB, DIV6_SUB,
@@ -482,6 +496,7 @@ static struct clk dsi1phy_clk = {
 static struct clk *late_main_clks[] = {
         &dsi0phy_clk,
         &dsi1phy_clk,
+        &twd_clk,
 };
 
 enum { MSTP001,
@@ -546,6 +561,7 @@ static struct clk mstp_clks[MSTP_NR] = {
 static struct clk_lookup lookups[] = {
         /* main clocks */
         CLKDEV_CON_ID("r_clk", &r_clk),
+        CLKDEV_DEV_ID("smp_twd", &twd_clk), /* smp_twd */
 
         /* DIV6 clocks */
         CLKDEV_CON_ID("vck1_clk", &div6_clks[DIV6_VCK1]),