Re: [PATCH v4 4/4] ARM: OMAP2+: Add pdata quirk for sys_clkout2 for omap3 DBB056

[Tony Lindgren <tony@atomide.com>]

* Christoph Fritz <chf.fritz@googlemail.com> [140214 06:24]:
> Full device tree support for clock control, especially to set frequencies,
> is not yet accomplished. Until then, configure the 24Mhz of sys_clkout2 to
> feed an USB-Hub here.

Hmm would like to see Tero's comments on this, I wonder if we should
wait on this to avoid extra churn?

Regards,

Tony
 
> Signed-off-by: Christoph Fritz <chf.fritz@googlemail.com>
> ---
>  arch/arm/mach-omap2/pdata-quirks.c |   37 ++++++++++++++++++++++++++++++++++++
>  1 file changed, 37 insertions(+)
> 
> diff --git a/arch/arm/mach-omap2/pdata-quirks.c b/arch/arm/mach-omap2/pdata-quirks.c
> index 435a823..e36ac3f 100644
> --- a/arch/arm/mach-omap2/pdata-quirks.c
> +++ b/arch/arm/mach-omap2/pdata-quirks.c
> @@ -172,6 +172,43 @@ static void __init am3517_evm_legacy_init(void)
>  
>  static void __init omap3_dbb056_legacy_init(void)
>  {
> +	struct clk *clkout2;
> +	struct clk *cm96fck;
> +
> +	/* Reparent clkout2 to 96M_FCK */
> +	pr_info("%s: Late Reparent clkout2 to 96M_FCK\n", __func__);
> +	clkout2 = clk_get(NULL, "clkout2_src_ck");
> +	if (clkout2 < 0) {
> +		pr_err("a83x-quirk: couldn't get clkout2_src_ck\n");
> +		return;
> +	}
> +	cm96fck = clk_get(NULL, "cm_96m_fck");
> +	if (cm96fck < 0) {
> +		pr_err("a83x-quirk: couldn't get cm_96m_fck\n");
> +		return;
> +	}
> +	if (clk_set_parent(clkout2, cm96fck) < 0) {
> +		pr_err("a83x-quirk: couldn't reparent clkout2_src_ck\n");
> +		return;
> +	}
> +
> +	/* Set clkout2 to 24MHz for internal usb hub*/
> +	pr_info("%s: Set clkout2 to 24MHz for internal usb hub\n", __func__);
> +	clkout2 = clk_get(NULL, "sys_clkout2");
> +	if (clkout2 < 0) {
> +		pr_err("%s: couldn't get sys_clkout2\n", __func__);
> +		return;
> +	}
> +	if (clk_set_rate(clkout2, 24000000) < 0) {
> +		pr_err("%s: couldn't set sys_clkout2 rate\n", __func__);
> +		return;
> +	}
> +	if (clk_prepare_enable(clkout2) < 0) {
> +		pr_err("%s: couldn't enable sys_clkout2\n", __func__);
> +		return;
> +	}
> +
> +	/* Initialize display */
>  	omap3_dbb056_display_init_of();
>  }
>  #endif /* CONFIG_ARCH_OMAP3 */
> -- 
> 1.7.10.4
>