linux-kernel - Re: [PATCH] clk: imx: add 'is_prepared' clk

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Date:	Tue, 10 Nov 2015 11:11:06 +0100
From:	Lucas Stach <l.stach@...gutronix.de>
To:	Bai Ping <b51503@...escale.com>
Cc:	shawnguo@...nel.org, kernel@...gutronix.de,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] clk: imx: add 'is_prepared' clk_ops callback for pllv3
 clk

Am Dienstag, den 03.11.2015, 02:06 +0800 schrieb Bai Ping:
> Add 'is_prepared' callback function for pllv3 type clk to make sure when
> the system is bootup, the unused clk is in a known state to match the
> prepare count info.
> 
> Signed-off-by: Bai Ping <b51503@...escale.com>

Reviewed-by: Lucas Stach <l.stach@...gutronix.de>

> ---
>  drivers/clk/imx/clk-pllv3.c | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/drivers/clk/imx/clk-pllv3.c b/drivers/clk/imx/clk-pllv3.c
> index 6addf8f..c05c43d 100644
> --- a/drivers/clk/imx/clk-pllv3.c
> +++ b/drivers/clk/imx/clk-pllv3.c
> @@ -97,6 +97,16 @@ static void clk_pllv3_unprepare(struct clk_hw *hw)
>  	writel_relaxed(val, pll->base);
>  }
>  
> +static int clk_pllv3_is_prepared(struct clk_hw *hw)
> +{
> +	struct clk_pllv3 *pll = to_clk_pllv3(hw);
> +
> +	if (readl_relaxed(pll->base) & BM_PLL_LOCK)
> +		return 1;
> +
> +	return 0;
> +}
> +
>  static unsigned long clk_pllv3_recalc_rate(struct clk_hw *hw,
>  					   unsigned long parent_rate)
>  {
> @@ -139,6 +149,7 @@ static int clk_pllv3_set_rate(struct clk_hw *hw, unsigned long rate,
>  static const struct clk_ops clk_pllv3_ops = {
>  	.prepare	= clk_pllv3_prepare,
>  	.unprepare	= clk_pllv3_unprepare,
> +	.is_prepared	= clk_pllv3_is_prepared,
>  	.recalc_rate	= clk_pllv3_recalc_rate,
>  	.round_rate	= clk_pllv3_round_rate,
>  	.set_rate	= clk_pllv3_set_rate,
> @@ -193,6 +204,7 @@ static int clk_pllv3_sys_set_rate(struct clk_hw *hw, unsigned long rate,
>  static const struct clk_ops clk_pllv3_sys_ops = {
>  	.prepare	= clk_pllv3_prepare,
>  	.unprepare	= clk_pllv3_unprepare,
> +	.is_prepared	= clk_pllv3_is_prepared,
>  	.recalc_rate	= clk_pllv3_sys_recalc_rate,
>  	.round_rate	= clk_pllv3_sys_round_rate,
>  	.set_rate	= clk_pllv3_sys_set_rate,
> @@ -265,6 +277,7 @@ static int clk_pllv3_av_set_rate(struct clk_hw *hw, unsigned long rate,
>  static const struct clk_ops clk_pllv3_av_ops = {
>  	.prepare	= clk_pllv3_prepare,
>  	.unprepare	= clk_pllv3_unprepare,
> +	.is_prepared	= clk_pllv3_is_prepared,
>  	.recalc_rate	= clk_pllv3_av_recalc_rate,
>  	.round_rate	= clk_pllv3_av_round_rate,
>  	.set_rate	= clk_pllv3_av_set_rate,
> @@ -279,6 +292,7 @@ static unsigned long clk_pllv3_enet_recalc_rate(struct clk_hw *hw,
>  static const struct clk_ops clk_pllv3_enet_ops = {
>  	.prepare	= clk_pllv3_prepare,
>  	.unprepare	= clk_pllv3_unprepare,
> +	.is_prepared	= clk_pllv3_is_prepared,
>  	.recalc_rate	= clk_pllv3_enet_recalc_rate,
>  };
>  

-- 
Pengutronix e.K.             | Lucas Stach                 |
Industrial Linux Solutions   | http://www.pengutronix.de/  |

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