From 4ea9e857eec6474a7fa1a0ded1366f202d45dbe5 Mon Sep 17 00:00:00 2001 From: Sascha Hauer Date: Wed, 31 Oct 2012 08:25:08 +0100 Subject: [PATCH] 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 --- arch/arm/mach-imx/clk-imx27.c | 17 ++++++++++++++--- 1 file changed, 14 insertions(+), 3 deletions(-) diff --git a/arch/arm/mach-imx/clk-imx27.c b/arch/arm/mach-imx/clk-imx27.c index 585ab256c58f..34f4aff46822 100644 --- a/arch/arm/mach-imx/clk-imx27.c +++ b/arch/arm/mach-imx/clk-imx27.c @@ -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); -- 2.20.1