Thread (42 messages) 42 messages, 5 authors, 2012-05-03
STALE5156d
Revisions (5)
  1. v1 [diff vs current]
  2. v3 [diff vs current]
  3. v3 [diff vs current]
  4. v3 [diff vs current]
  5. v3 current

[PATCH V3 3/8] SPEAr: clk: Add VCO-PLL Synthesizer clock

From: Viresh Kumar <hidden>
Date: 2012-05-03 09:49:47
Subsystem: common clk framework, spear platform/clock/pinctrl support, the rest · Maintainers: Michael Turquette, Stephen Boyd, Viresh Kumar, Linus Torvalds

On 4/24/2012 12:20 PM, Viresh KUMAR wrote:
All SPEAr SoC's contain PLLs. Their Fout is derived based on following equations

- In normal mode
  vco = (2 * M[15:8] * Fin)/N

- In Dithered mode
  vco = (2 * M[15:0] * Fin)/(256 * N)

pll_rate = vco/2^p

vco and pll are very closely bound to each other,
"vco needs to program: mode, m & n" and "pll needs to program p",
both share common enable/disable logic and registers.

This patch adds in support for this type of clock.

Signed-off-by: Viresh Kumar <redacted>
---
Sorry for another fixup. Required due to Saravana's patch:

---
 drivers/clk/spear/clk-vco-pll.c |   22 ++++++++++++++++++----
 1 files changed, 18 insertions(+), 4 deletions(-)
diff --git a/drivers/clk/spear/clk-vco-pll.c b/drivers/clk/spear/clk-vco-pll.c
index 318b04e..dcd4bdf 100644
--- a/drivers/clk/spear/clk-vco-pll.c
+++ b/drivers/clk/spear/clk-vco-pll.c
@@ -282,6 +282,7 @@ struct clk *clk_register_vco_pll(const char *vco_name, const char *pll_name,
        struct clk_vco *vco;
        struct clk_pll *pll;
        struct clk *vco_clk, *tpll_clk, *tvco_gate_clk;
+       struct clk_init_data vco_init, pll_init;
        const char **vco_parent_name;
 
        if (!vco_name || !pll_name || !parent_name || !mode_reg || !cfg_reg ||
@@ -308,7 +309,10 @@ struct clk *clk_register_vco_pll(const char *vco_name, const char *pll_name,
        vco->rtbl = rtbl;
        vco->rtbl_cnt = rtbl_cnt;
        vco->lock = lock;
+       vco->hw.init = &vco_init;
+
        pll->vco = vco;
+       pll->hw.init = &pll_init;
 
        if (vco_gate_name) {
                tvco_gate_clk = clk_register_gate(NULL, vco_gate_name,
@@ -323,13 +327,23 @@ struct clk *clk_register_vco_pll(const char *vco_name, const char *pll_name,
                vco_parent_name = &parent_name;
        }
 
-       vco_clk = clk_register(NULL, vco_name, &clk_vco_ops, &vco->hw,
-                       vco_parent_name, 1, flags);
+       vco_init.name = vco_name;
+       vco_init.ops = &clk_vco_ops;
+       vco_init.flags = flags;
+       vco_init.parent_names = vco_parent_name;
+       vco_init.num_parents = 1;
+
+       pll_init.name = pll_name;
+       pll_init.ops = &clk_pll_ops;
+       pll_init.flags = CLK_SET_RATE_PARENT;
+       pll_init.parent_names = &vco_name;
+       pll_init.num_parents = 1;
-- 
viresh
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