clk: rockchip: rk3399: implement getting wdt/alive clocks

In order to correctly calculate the designware watchdog
timeouts, the watchdog clock is required. Implement required
clocks to facilitate this.

Signed-off-by: Jack Mitchell <ml@embed.me.uk>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>

diff --git a/drivers/clk/rockchip/clk_rk3399.c b/drivers/clk/rockchip/clk_rk3399.c
index 22c373a..44fb8ca 100644 (file)
--- a/drivers/clk/rockchip/clk_rk3399.c
+++ b/drivers/clk/rockchip/clk_rk3399.c
@@ -233,6 +233,10 @@ enum {
        DCLK_VOP_DIV_CON_MASK           = 0xff,
        DCLK_VOP_DIV_CON_SHIFT          = 0,
 
+       /* CLKSEL_CON57 */
+       PCLK_ALIVE_DIV_CON_SHIFT        = 0,
+       PCLK_ALIVE_DIV_CON_MASK         = 0x1f << PCLK_ALIVE_DIV_CON_SHIFT,
+
        /* CLKSEL_CON58 */
        CLK_SPI_PLL_SEL_WIDTH = 1,
        CLK_SPI_PLL_SEL_MASK = ((1 < CLK_SPI_PLL_SEL_WIDTH) - 1),
@@ -867,6 +871,17 @@ static ulong rk3399_ddr_set_clk(struct rockchip_cru *cru,
        return set_rate;
 }
 
+static ulong rk3399_alive_get_clk(struct rockchip_cru *cru)
+{
+        u32 div, val;
+
+        val = readl(&cru->clksel_con[57]);
+        div = (val & PCLK_ALIVE_DIV_CON_MASK) >>
+              PCLK_ALIVE_DIV_CON_SHIFT;
+
+        return DIV_TO_RATE(GPLL_HZ, div);
+}
+
 static ulong rk3399_saradc_get_clk(struct rockchip_cru *cru)
 {
        u32 div, val;
@@ -936,6 +951,10 @@ static ulong rk3399_clk_get_rate(struct clk *clk)
        case ACLK_GIC_PRE:
        case PCLK_DDR:
                break;
+       case PCLK_ALIVE:
+       case PCLK_WDT:
+               rate = rk3399_alive_get_clk(priv->cru);
+               break;
        default:
                log_debug("Unknown clock %lu\n", clk->id);
                return -ENOENT;
@@ -1502,6 +1521,7 @@ static ulong rk3399_pmuclk_get_rate(struct clk *clk)
        case PLL_PPLL:
                return PPLL_HZ;
        case PCLK_RKPWM_PMU:
+       case PCLK_WDT_M0_PMU:
                rate = rk3399_pwm_get_clk(priv->pmucru);
                break;
        case SCLK_I2C0_PMU: