[PATCH] ARM: OMAP4: clock: Add CPU local timer clock node

Paul Walmsley paul at pwsan.com
Fri Dec 16 07:03:31 EST 2011

From: Santosh Shilimkar <santosh.shilimkar at ti.com>

Local timer clock is sourced from the CPU clock and hence changes
along with CPU clock. These per CPU local timers are used as
clock-events, so they need to be reconfigured on CPU frequency
change as part of CPUfreq governor.

Newly introduced clockevents_reconfigure() needs to know the
twd clock-rate. Provide a clock-node to make clk_get_rate() work
for TWD.

Signed-off-by: Santosh Shilimkar <santosh.shilimkar at ti.com>
Cc: Paul Walmsley <paul at pwsan.com>
Cc: Kevin Hilman <khilman at ti.com>
[paul at pwsan.com: renamed clock node to 'mpu_periphclk' to indicate that this
 is the Cortex-A9 MPCore subsystem clock PERIPHCLK (DDI 0407G); moved
 clock and clkdev entries to match the autogenerated script output]
Signed-off-by: Paul Walmsley <paul at pwsan.com>

This version 3 has been updated by Santosh to use "smp_twd" as the dev_id 
and a NULL con_id, to match Linus Walleij's code.

 arch/arm/mach-omap2/clock44xx_data.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/arch/arm/mach-omap2/clock44xx_data.c b/arch/arm/mach-omap2/clock44xx_data.c
index 0798a80..730097e 100644
--- a/arch/arm/mach-omap2/clock44xx_data.c
+++ b/arch/arm/mach-omap2/clock44xx_data.c
@@ -1206,6 +1206,14 @@ static struct clk l4_wkup_clk_mux_ck = {
 	.recalc		= &omap2_clksel_recalc,
+static struct clk mpu_periphclk = {
+	.name		= "mpu_periphclk",
+	.parent		= &dpll_mpu_ck,
+	.ops		= &clkops_null,
+	.fixed_div	= 2,
+	.recalc		= &omap_fixed_divisor_recalc,
 static struct clk ocp_abe_iclk = {
 	.name		= "ocp_abe_iclk",
 	.parent		= &aess_fclk,
@@ -3189,6 +3197,7 @@ static struct omap_clk omap44xx_clks[] = {
 	CLK(NULL,	"l4_div_ck",			&l4_div_ck,	CK_443X),
 	CLK(NULL,	"lp_clk_div_ck",		&lp_clk_div_ck,	CK_443X),
 	CLK(NULL,	"l4_wkup_clk_mux_ck",		&l4_wkup_clk_mux_ck,	CK_443X),
+	CLK("smp_twd",	NULL,				&mpu_periphclk,	CK_443X),
 	CLK(NULL,	"ocp_abe_iclk",			&ocp_abe_iclk,	CK_443X),
 	CLK(NULL,	"per_abe_24m_fclk",		&per_abe_24m_fclk,	CK_443X),
 	CLK(NULL,	"per_abe_nc_fclk",		&per_abe_nc_fclk,	CK_443X),

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