linux-kernel - Re: [PATCH 1/4] CLK: ti: dra7: Initialize USB

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Message-ID: <51FA7976.8020707@ti.com>
Date:	Thu, 1 Aug 2013 10:06:30 -0500
From:	Nishanth Menon <nm@...com>
To:	Roger Quadros <rogerq@...com>
CC:	<tony@...mide.com>, <rnayak@...com>, <benoit.cousson@...aro.org>,
	<balbi@...com>, <george.cherian@...com>, <kishon@...com>,
	<dmurphy@...com>, <t-kristo@...com>, <linux-omap@...r.kernel.org>,
	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/4] CLK: ti: dra7: Initialize USB_DPLL

On 08/01/2013 09:58 AM, Roger Quadros wrote:
> USB_DPLL must be initialized and locked at boot so that
> USB modules can work.
>
> Also program USB_DLL_M2 output to half rate.
>
> Signed-off-by: Roger Quadros <rogerq@...com>
> ---
>   drivers/clk/omap/clk-7xx.c |   11 +++++++++++
>   1 files changed, 11 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/clk/omap/clk-7xx.c b/drivers/clk/omap/clk-7xx.c
> index ddb39dd..f444513 100644
> --- a/drivers/clk/omap/clk-7xx.c
> +++ b/drivers/clk/omap/clk-7xx.c
> @@ -19,6 +19,7 @@
>
>   #define DRA7_DPLL_ABE_DEFFREQ				361267200
>   #define DRA7_DPLL_GMAC_DEFFREQ				1000000000
> +#define DRA7_DPLL_USB_DEFFREQ				960000000
>
>
>   static struct omap_dt_clk dra7xx_clks[] = {
> @@ -63,5 +64,15 @@ int __init dra7xx_clk_init(void)
>   	if (rc)
>   		pr_err("%s: failed to configure GMAC DPLL!\n", __func__);
>
> +	dpll_ck = clk_get_sys(NULL, "dpll_usb_ck");
> +	rc = clk_set_rate(dpll_ck, DRA7_DPLL_USB_DEFFREQ);
> +	if (rc)
> +		pr_err("%s: failed to configure USB DPLL!\n", __func__);
> +
> +	dpll_ck = clk_get_sys(NULL, "dpll_usb_m2_ck");
> +	rc = clk_set_rate(dpll_ck, DRA7_DPLL_USB_DEFFREQ/2);
> +	if (rc)
> +		pr_err("%s: failed to set USB_DPLL M2 OUT\n", __func__);
> +
>   	return rc;
>   }
>
As I had mentioned on [1] - we are going to see similar needs keep 
popping up. there is no need to hack this up for even more peripherals :(

http://marc.info/?l=linux-omap&m=137536803106017&w=2

-- 
Regards,
Nishanth Menon
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