[PATCH v2 09/20] clk: samsung: clk-pll: Add support for pll_{0516,0517,518}

Peter Griffin
2023-10-10T22:50:25Z

These plls are found in the Tensor gs101 SoC found in the Pixel 6.

pll0516x: Integer PLL with high frequency
pll0517x: Integer PLL with middle frequency
pll0518x: Integer PLL with low frequency

PLL0516x
FOUT = (MDIV * 2 * FIN)/PDIV * 2^SDIV)

PLL0517x and PLL0518x
FOUT = (MDIV * FIN)/PDIV*2^SDIV)

The PLLs are similar enough to pll_0822x that the same code can handle
both. The main difference is the change in the fout formula for the
high frequency 0516 pll.

Locktime for 516,517 & 518 is 150 the same as the pll_0822x lock factor.
MDIV, SDIV PDIV masks and bit shifts are also the same as 0822x.

When defining the PLL the "con" parameter should be set to CON3
register, like this

PLL(pll_0517x, CLK_FOUT_SHARED0_PLL, "fout_shared0_pll", "oscclk",
PLL_LOCKTIME_PLL_SHARED0, PLL_CON3_PLL_SHARED0,
NULL),

Signed-off-by: Peter Griffin <peter.griffin@linaro.org>
---
drivers/clk/samsung/clk-pll.c | 9 ++++++++-
drivers/clk/samsung/clk-pll.h | 3 +++
2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/samsung/clk-pll.c b/drivers/clk/samsung/clk-pll.c
index 74934c6182ce..4ef9fea2a425 100644
--- a/drivers/clk/samsung/clk-pll.c
+++ b/drivers/clk/samsung/clk-pll.c
@@ -442,7 +442,11 @@ static unsigned long samsung_pll0822x_recalc_rate(struct clk_hw *hw,
pdiv = (pll_con3 >> PLL0822X_PDIV_SHIFT) & PLL0822X_PDIV_MASK;
sdiv = (pll_con3 >> PLL0822X_SDIV_SHIFT) & PLL0822X_SDIV_MASK;

- fvco *= mdiv;
+ if (pll->type == pll_0516x)
+ fvco = fvco * 2 * mdiv;
+ else
+ fvco *= mdiv;
+
do_div(fvco, (pdiv << sdiv));

return (unsigned long)fvco;
@@ -1316,6 +1320,9 @@ static void __init _samsung_clk_register_pll(struct samsung_clk_provider *ctx,
case pll_1417x:
case pll_0818x:
case pll_0822x:
+ case pll_0516x:
+ case pll_0517x:
+ case pll_0518x:
pll->enable_offs = PLL0822X_ENABLE_SHIFT;
pll->lock_offs = PLL0822X_LOCK_STAT_SHIFT;
if (!pll->rate_table)
diff --git a/drivers/clk/samsung/clk-pll.h b/drivers/clk/samsung/clk-pll.h
index 0725d485c6ee..ffd3d52c0dec 100644
--- a/drivers/clk/samsung/clk-pll.h
+++ b/drivers/clk/samsung/clk-pll.h
@@ -38,6 +38,9 @@ enum samsung_pll_type {
pll_0822x,
pll_0831x,
pll_142xx,
+ pll_0516x,
+ pll_0517x,
+ pll_0518x,
};

#define PLL_RATE(_fin, _m, _p, _s, _k, _ks) \
--
2.42.0.609.gbb76f46606-goog