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ARM i.MX27: Fix low reference clock path 

The i.MX27 clock tree can either be driven from a 26MHz oscillator
or from a 32768Hz oscillator. The latter was not properly implemented,
the mux between these two pathes was missing. Add this mux and while
at it rename the 'prem' (premultiplier) clk to 'fpm' (Frequency
Pre-Multiplier) to better match the datasheet.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
hifive-unleashed-5.1
Sascha Hauer 2012-10-31 08:25:08 +01:00
parent 9b49e170c0
commit 4ea9e857ee
1 changed files with 14 additions and 3 deletions
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17
arch/arm/mach-imx/clk-imx27.c
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@ -51,8 +51,10 @@
static const char *vpu_sel_clks[] = { "spll", "mpll_main2", };
static const char *cpu_sel_clks[] = { "mpll_main2", "mpll", };
static const char *mpll_sel_clks[] = { "fpm", "mpll_osc_sel", };
static const char *mpll_osc_sel_clks[] = { "ckih", "ckih_div1p5", };
static const char *clko_sel_clks[] = {
"ckil", "prem", "ckih", "ckih",
"ckil", "fpm", "ckih", "ckih",
"ckih", "mpll", "spll", "cpu_div",
"ahb", "ipg", "per1_div", "per2_div",
"per3_div", "per4_div", "ssi1_div", "ssi2_div",
@ -79,7 +81,8 @@ enum mx27_clks {
vpu_ahb_gate, fec_ahb_gate, emma_ahb_gate, emi_ahb_gate, dma_ahb_gate,
csi_ahb_gate, brom_ahb_gate, ata_ahb_gate, wdog_ipg_gate, usb_ipg_gate,
uart6_ipg_gate, uart5_ipg_gate, uart4_ipg_gate, uart3_ipg_gate,
uart2_ipg_gate, uart1_ipg_gate, clk_max
uart2_ipg_gate, uart1_ipg_gate, ckih_div1p5, fpm, mpll_osc_sel,
mpll_sel, clk_max
};
static struct clk *clk[clk_max];
@ -91,7 +94,15 @@ int __init mx27_clocks_init(unsigned long fref)
clk[dummy] = imx_clk_fixed("dummy", 0);
clk[ckih] = imx_clk_fixed("ckih", fref);
clk[ckil] = imx_clk_fixed("ckil", 32768);
clk[mpll] = imx_clk_pllv1("mpll", "ckih", CCM_MPCTL0);
clk[fpm] = imx_clk_fixed_factor("fpm", "ckil", 1024, 1);
clk[ckih_div1p5] = imx_clk_fixed_factor("ckih_div1p5", "ckih", 2, 3);
clk[mpll_osc_sel] = imx_clk_mux("mpll_osc_sel", CCM_CSCR, 4, 1,
mpll_osc_sel_clks,
ARRAY_SIZE(mpll_osc_sel_clks));
clk[mpll_sel] = imx_clk_mux("mpll_sel", CCM_CSCR, 16, 1, mpll_sel_clks,
ARRAY_SIZE(mpll_sel_clks));
clk[mpll] = imx_clk_pllv1("mpll", "mpll_sel", CCM_MPCTL0);
clk[spll] = imx_clk_pllv1("spll", "ckih", CCM_SPCTL0);
clk[mpll_main2] = imx_clk_fixed_factor("mpll_main2", "mpll", 2, 3);