linux-kernel - Re: [PATCH v3 2/4] clk: qcom: Add support for RCGs with shared branches

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Date:	Wed, 9 Sep 2015 15:46:13 -0700
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	Georgi Djakov <georgi.djakov@...aro.org>
Cc:	mturquette@...libre.com, linux-clk@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v3 2/4] clk: qcom: Add support for RCGs with shared
 branches

On 08/13, Georgi Djakov wrote:
> diff --git a/drivers/clk/qcom/clk-rcg.h b/drivers/clk/qcom/clk-rcg.h
> index 56028bb31d87..0693b9e0b15e 100644
> --- a/drivers/clk/qcom/clk-rcg.h
> +++ b/drivers/clk/qcom/clk-rcg.h
> @@ -153,8 +153,8 @@ extern const struct clk_ops clk_dyn_rcg_ops;
>   * @hid_width: number of bits in half integer divider
>   * @parent_map: map from software's parent index to hardware's src_sel field
>   * @freq_tbl: frequency table
> + * @current_freq: last cached frequency when using branches with shared RCGs
>   * @clkr: regmap clock handle
> - * @lock: register lock

Thanks.

>   *
>   */
>  struct clk_rcg2 {
> diff --git a/drivers/clk/qcom/clk-rcg2.c b/drivers/clk/qcom/clk-rcg2.c
> index 9aec1761fd29..681faf2dcdc5 100644
> --- a/drivers/clk/qcom/clk-rcg2.c
> +++ b/drivers/clk/qcom/clk-rcg2.c
> +
> +static int clk_rcg2_shared_enable(struct clk_hw *hw)
> +{
> +	struct clk_rcg2 *rcg = to_clk_rcg2(hw);
> +	const char *name = clk_hw_get_name(hw);
> +
> +	if (!rcg->current_freq) {
> +		pr_err("%s: Please set rate before enabling\n", name);

Why? Can't we find the current freq during recalc_rate?

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