[PATCH] ARM i.MX27: Fix low reference clock path

[tremyfr@yahoo.fr (trem)]

On 31/10/12 08:28, Sascha Hauer wrote:
> 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>

Tested-by: Philippe Reynes <tremyfr@yahoo.fr>

> ---
>   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 3b6b640..f8d9129 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);
>