From a00dfa042d3eecbe96308d87f38710e79a29e00c Mon Sep 17 00:00:00 2001 From: Philipp Tomsich Date: Fri, 23 Jun 2017 00:01:10 +0200 Subject: [PATCH] rockchip: clk: rk3368: implement DPLL (DRAM PLL) support To implement a TPL stage (incl. its DRAM controller setup) for the RK3368, we'll want to configure the DPLL (DRAM PLL). This commit implements setting the DPLL (CLK_DDR) and provides PLL configuration details for the common DRAM operating speeds found on RK3368 boards. Signed-off-by: Philipp Tomsich Reviewed-by: Simon Glass --- drivers/clk/rockchip/clk_rk3368.c | 35 +++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) diff --git a/drivers/clk/rockchip/clk_rk3368.c b/drivers/clk/rockchip/clk_rk3368.c index d05be72c9c..33d29464fb 100644 --- a/drivers/clk/rockchip/clk_rk3368.c +++ b/drivers/clk/rockchip/clk_rk3368.c @@ -250,6 +250,37 @@ static ulong rk3368_clk_get_rate(struct clk *clk) return rate; } +static ulong rk3368_ddr_set_clk(struct rk3368_cru *cru, ulong set_rate) +{ + const struct pll_div *dpll_cfg = NULL; + const ulong MHz = 1000000; + + /* Fout = ((Fin /NR) * NF )/ NO */ + static const struct pll_div dpll_1200 = + PLL_DIVISORS(1200 * MHz, 1, 1); + static const struct pll_div dpll_1332 = + PLL_DIVISORS(1332 * MHz, 2, 1); + static const struct pll_div dpll_1600 = + PLL_DIVISORS(1600 * MHz, 3, 2); + + switch (set_rate) { + case 1200*MHz: + dpll_cfg = &dpll_1200; + break; + case 1332*MHz: + dpll_cfg = &dpll_1332; + break; + case 1600*MHz: + dpll_cfg = &dpll_1600; + break; + default: + error("Unsupported SDRAM frequency!,%ld\n", set_rate); + } + rkclk_set_pll(cru, DPLL, dpll_cfg); + + return set_rate; +} + static ulong rk3368_clk_set_rate(struct clk *clk, ulong rate) { struct rk3368_clk_priv *priv = dev_get_priv(clk->dev); @@ -257,6 +288,10 @@ static ulong rk3368_clk_set_rate(struct clk *clk, ulong rate) debug("%s id:%ld rate:%ld\n", __func__, clk->id, rate); switch (clk->id) { + case CLK_DDR: + ret = rk3368_ddr_set_clk(priv->cru, rate); + break; + case SCLK_SDMMC: case SCLK_EMMC: ret = rk3368_mmc_set_clk(priv->cru, clk->id, rate); -- 2.39.2