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clk: rockchip: add a dummy clock for the watchdog pclk on rk3399 

Like rk3288, the pclk supplying the watchdog is controlled via the
SGRF register area. Additionally the SGRF isn't even writable in
every boot mode.

But still the clock control is available and in the future someone
might want to use it. Therefore define a simple clock for the time
being so that the watchdog driver can read its rate.

Signed-off-by: Xing Zheng <zhengxing@rock-chips.com>
Reviewed-by: Stephen Barber <smbarber@chromium.org>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
This commit is contained in:
Xing Zheng 2016-05-25 16:51:56 +08:00 committed by Heiko Stuebner
parent 1a695a905c
commit 26e0ee1c62
1 changed files with 9 additions and 0 deletions
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9
drivers/clk/rockchip/clk-rk3399.c
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@ -1498,6 +1498,7 @@ static void __init rk3399_clk_init(struct device_node *np)
{
struct rockchip_clk_provider *ctx;
void __iomem *reg_base;
struct clk *clk;
reg_base = of_iomap(np, 0);
if (!reg_base) {
@ -1511,6 +1512,14 @@ static void __init rk3399_clk_init(struct device_node *np)
return;
}
/* Watchdog pclk is controlled by RK3399 SECURE_GRF_SOC_CON3[8]. */
clk = clk_register_fixed_factor(NULL, "pclk_wdt", "pclk_alive", 0, 1, 1);
if (IS_ERR(clk))
pr_warn("%s: could not register clock pclk_wdt: %ld\n",
__func__, PTR_ERR(clk));
else
rockchip_clk_add_lookup(ctx, clk, PCLK_WDT);
rockchip_clk_register_plls(ctx, rk3399_pll_clks,
ARRAY_SIZE(rk3399_pll_clks), -1);