[PATCH 2/2] clk: sunxi: add prediv table for a31 ahb1 clock

[Vishnu Patekar]

For ahb1 clock, move mshift and mwidth to parent specific width and shift.
getter differentiates parents with prediv, with non-zero prediv width.

Also, removed unused ahb1 recalc function, it's now handled in generic
factors recalc.

Signed-off-by: Vishnu Patekar <vishnupatekar0...@gmail.com>
---
 drivers/clk/sunxi/clk-sunxi.c | 31 +++++++++----------------------
 1 file changed, 9 insertions(+), 22 deletions(-)

diff --git a/drivers/clk/sunxi/clk-sunxi.c b/drivers/clk/sunxi/clk-sunxi.c
index 91de0a0..5a5f26b 100644
--- a/drivers/clk/sunxi/clk-sunxi.c
+++ b/drivers/clk/sunxi/clk-sunxi.c
@@ -282,8 +282,6 @@ static void sun5i_a13_get_ahb_factors(struct 
factors_request *req)
        req->p = div;
 }
 
-#define SUN6I_AHB1_PARENT_PLL6 3
-
 /**
  * sun6i_a31_get_ahb_factors() - calculates m, p factors for AHB
  * AHB rate is calculated as follows
@@ -307,7 +305,7 @@ static void sun6i_get_ahb1_factors(struct factors_request 
*req)
        div = DIV_ROUND_UP(req->parent_rate, req->rate);
 
        /* calculate pre-divider if parent is pll6 */
-       if (req->parent_index == SUN6I_AHB1_PARENT_PLL6) {
+       if (req->prediv_width) {
                if (div < 4)
                        calcp = 0;
                else if (div / 2 < 4)
@@ -329,22 +327,6 @@ static void sun6i_get_ahb1_factors(struct factors_request 
*req)
 }
 
 /**
- * sun6i_ahb1_recalc() - calculates AHB clock rate from m, p factors and
- *                      parent index
- */
-static void sun6i_ahb1_recalc(struct factors_request *req)
-{
-       req->rate = req->parent_rate;
-
-       /* apply pre-divider first if parent is pll6 */
-       if (req->parent_index == SUN6I_AHB1_PARENT_PLL6)
-               req->rate /= req->m + 1;
-
-       /* clk divider */
-       req->rate >>= req->p;
-}
-
-/**
  * sun4i_get_apb1_factors() - calculates m, p factors for APB1
  * APB1 rate is calculated as follows
  * rate = (parent_rate >> p) / (m + 1);
@@ -474,12 +456,17 @@ static const struct clk_factors_config 
sun5i_a13_ahb_config = {
 };
 
 static const struct clk_factors_config sun6i_ahb1_config = {
-       .mshift = 6,
-       .mwidth = 2,
        .pshift = 4,
        .pwidth = 2,
 };
 
+static const struct clk_factors_prediv sun6i_ahb1_prediv[] = {
+       {.parent_index = 0, .shift = 0, .width = 0 },   /* LOSC  */
+       {.parent_index = 1, .shift = 0, .width = 0 },   /* OSC24MHz */
+       {.parent_index = 2, .shift = 0, .width = 0 },   /* AXI */
+       {.parent_index = 3, .shift = 6, .width = 2 }    /* PLL6/Pre_div */
+};
+
 static const struct clk_factors_config sun4i_apb1_config = {
        .mshift = 0,
        .mwidth = 5,
@@ -551,8 +538,8 @@ static const struct factors_data sun6i_ahb1_data 
__initconst = {
        .mux = 12,
        .muxmask = BIT(1) | BIT(0),
        .table = &sun6i_ahb1_config,
+       .prediv_table = sun6i_ahb1_prediv,
        .getter = sun6i_get_ahb1_factors,
-       .recalc = sun6i_ahb1_recalc,
 };
 
 static const struct factors_data sun4i_apb1_data __initconst = {
-- 
1.9.1