rockchip: clk: Add SARADC clock support for rk3288

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>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Acked-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>

diff --git a/drivers/clk/rockchip/clk_rk3288.c b/drivers/clk/rockchip/clk_rk3288.c
index 478195b10b0eb6175b86a8a0b599c1011af3671e..a133810bf6074416aae264302bab2bb16895c44f 100644 (file)
--- a/drivers/clk/rockchip/clk_rk3288.c
+++ b/drivers/clk/rockchip/clk_rk3288.c
@@ -5,6 +5,7 @@
  */
 
 #include <common.h>
+#include <bitfield.h>
 #include <clk-uclass.h>
 #include <dm.h>
 #include <dt-structs.h>
@@ -111,6 +112,15 @@ enum {
        PERI_ACLK_DIV_SHIFT     = 0,
        PERI_ACLK_DIV_MASK      = 0x1f << PERI_ACLK_DIV_SHIFT,
 
+       /*
+        * CLKSEL24
+        * saradc_div_con:
+        * clk_saradc=24MHz/(saradc_div_con+1)
+        */
+       CLK_SARADC_DIV_CON_SHIFT        = 8,
+       CLK_SARADC_DIV_CON_MASK         = GENMASK(15, 8),
+       CLK_SARADC_DIV_CON_WIDTH        = 8,
+
        SOCSTS_DPLL_LOCK        = 1 << 5,
        SOCSTS_APLL_LOCK        = 1 << 6,
        SOCSTS_CPLL_LOCK        = 1 << 7,
@@ -634,6 +644,31 @@ static ulong rockchip_spi_set_clk(struct rk3288_cru *cru, uint gclk_rate,
        return rockchip_spi_get_clk(cru, gclk_rate, periph);
 }
 
+static ulong rockchip_saradc_get_clk(struct rk3288_cru *cru)
+{
+       u32 div, val;
+
+       val = readl(&cru->cru_clksel_con[24]);
+       div = bitfield_extract(val, CLK_SARADC_DIV_CON_SHIFT,
+                              CLK_SARADC_DIV_CON_WIDTH);
+
+       return DIV_TO_RATE(OSC_HZ, div);
+}
+
+static ulong rockchip_saradc_set_clk(struct rk3288_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->cru_clksel_con[24],
+                    CLK_SARADC_DIV_CON_MASK,
+                    src_clk_div << CLK_SARADC_DIV_CON_SHIFT);
+
+       return rockchip_saradc_get_clk(cru);
+}
+
 static ulong rk3288_clk_get_rate(struct clk *clk)
 {
        struct rk3288_clk_priv *priv = dev_get_priv(clk->dev);
@@ -666,6 +701,9 @@ static ulong rk3288_clk_get_rate(struct clk *clk)
                return gclk_rate;
        case PCLK_PWM:
                return PD_BUS_PCLK_HZ;
+       case SCLK_SARADC:
+               new_rate = rockchip_saradc_get_clk(priv->cru);
+               break;
        default:
                return -ENOENT;
        }
@@ -756,6 +794,9 @@ static ulong rk3288_clk_set_rate(struct clk *clk, ulong rate)
                new_rate = rate;
                break;
 #endif
+       case SCLK_SARADC:
+               new_rate = rockchip_saradc_set_clk(priv->cru, rate);
+               break;
        default:
                return -ENOENT;
        }