On Wed, 13 Sep 2017, David Wu wrote:
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...@rock-chips.com>
Reviewed-by: Philipp Tomsich <philipp.toms...@theobroma-systems.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,
Can we use GENMASK here?
+ 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;
}
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