The clk_saradc is dividing from the 24M, clk_saradc=24MHz/(saradc_div_con+1). Saradc integer divider control register is 8-bits width.
Signed-off-by: David Wu david.wu@rock-chips.com --- drivers/clk/rockchip/clk_rk3399.c | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+)
diff --git a/drivers/clk/rockchip/clk_rk3399.c b/drivers/clk/rockchip/clk_rk3399.c index 3edafea..5efe2c2 100644 --- a/drivers/clk/rockchip/clk_rk3399.c +++ b/drivers/clk/rockchip/clk_rk3399.c @@ -12,6 +12,7 @@ #include <errno.h> #include <mapmem.h> #include <syscon.h> +#include <bitfield.h> #include <asm/io.h> #include <asm/arch/clock.h> #include <asm/arch/cru_rk3399.h> @@ -182,6 +183,7 @@ enum { /* CLKSEL_CON26 */ CLK_SARADC_DIV_CON_SHIFT = 8, CLK_SARADC_DIV_CON_MASK = 0xff << CLK_SARADC_DIV_CON_SHIFT, + CLK_SARADC_DIV_CON_WIDTH = 8,
/* CLKSEL_CON27 */ CLK_TSADC_SEL_X24M = 0x0, @@ -860,6 +862,32 @@ static ulong rk3399_ddr_set_clk(struct rk3399_cru *cru,
return set_rate; } + +static ulong rk3399_saradc_get_clk(struct rk3399_cru *cru) +{ + u32 div, val; + + val = readl(&cru->clksel_con[26]); + div = bitfield_extract(val, CLK_SARADC_DIV_CON_SHIFT, + CLK_SARADC_DIV_CON_WIDTH); + + return DIV_TO_RATE(OSC_HZ, div); +} + +static ulong rk3399_saradc_set_clk(struct rk3399_cru *cru, uint hz) +{ + int src_clk_div; + + src_clk_div = DIV_ROUND_UP(OSC_HZ, hz) - 1; + assert(src_clk_div < 128); + + rk_clrsetreg(&cru->clksel_con[26], + CLK_SARADC_DIV_CON_MASK, + src_clk_div << CLK_SARADC_DIV_CON_SHIFT); + + return rk3399_saradc_get_clk(cru); +} + static ulong rk3399_clk_get_rate(struct clk *clk) { struct rk3399_clk_priv *priv = dev_get_priv(clk->dev); @@ -895,6 +923,9 @@ static ulong rk3399_clk_get_rate(struct clk *clk) break; case PCLK_EFUSE1024NS: break; + case SCLK_SARADC: + rate = rk3399_saradc_get_clk(priv->cru); + break; default: return -ENOENT; } @@ -943,6 +974,9 @@ static ulong rk3399_clk_set_rate(struct clk *clk, ulong rate) break; case PCLK_EFUSE1024NS: break; + case SCLK_SARADC: + ret = rk3399_saradc_set_clk(priv->cru, rate); + break; default: return -ENOENT; }