linux-kernel - Re: [PATCH v3 2/5] clk: qcom: clk-alpha-pll: Add HUAYRA

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Date: Fri, 05 Apr 2024 14:37:22 -0700
From: Stephen Boyd <sboyd@...nel.org>
To: Bjorn Andersson <andersson@...nel.org>, Conor Dooley <conor+dt@...nel.org>, Konrad Dybcio <konrad.dybcio@...aro.org>, Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Michael Turquette <mturquette@...libre.com>, Rob Herring <robh@...nel.org>
Cc: Marijn Suijten <marijn.suijten@...ainline.org>, Konrad Dybcio <konradybcio@...nel.org>, linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, Konrad Dybcio <konrad.dybcio@...aro.org>, Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Subject: Re: [PATCH v3 2/5] clk: qcom: clk-alpha-pll: Add HUAYRA_2290 support

Quoting Konrad Dybcio (2024-03-26 14:08:24)
> diff --git a/drivers/clk/qcom/clk-alpha-pll.c b/drivers/clk/qcom/clk-alpha-pll.c
> index 8a412ef47e16..27ba8aa3e577 100644
> --- a/drivers/clk/qcom/clk-alpha-pll.c
> +++ b/drivers/clk/qcom/clk-alpha-pll.c
> @@ -779,6 +792,40 @@ static long clk_alpha_pll_round_rate(struct clk_hw *hw, unsigned long rate,
>         return clamp(rate, min_freq, max_freq);
>  }
>  
> +void clk_huayra_2290_pll_configure(struct clk_alpha_pll *pll, struct regmap *regmap,
> +                                  const struct alpha_pll_config *config)
> +{
> +       u32 val;
> +
> +       clk_alpha_pll_write_config(regmap, PLL_CONFIG_CTL(pll), config->config_ctl_val);
> +       clk_alpha_pll_write_config(regmap, PLL_CONFIG_CTL_U(pll), config->config_ctl_hi_val);
> +       clk_alpha_pll_write_config(regmap, PLL_CONFIG_CTL_U1(pll), config->config_ctl_hi1_val);
> +       clk_alpha_pll_write_config(regmap, PLL_TEST_CTL(pll), config->test_ctl_val);
> +       clk_alpha_pll_write_config(regmap, PLL_TEST_CTL_U(pll), config->test_ctl_hi_val);
> +       clk_alpha_pll_write_config(regmap, PLL_TEST_CTL_U1(pll), config->test_ctl_hi1_val);
> +       clk_alpha_pll_write_config(regmap, PLL_L_VAL(pll), config->l);
> +       clk_alpha_pll_write_config(regmap, PLL_ALPHA_VAL(pll), config->alpha);
> +       clk_alpha_pll_write_config(regmap, PLL_USER_CTL(pll), config->user_ctl_val);
> +
> +       /* Set PLL_BYPASSNL */
> +       regmap_update_bits(regmap, PLL_MODE(pll), PLL_BYPASSNL, PLL_BYPASSNL);
> +       regmap_read(regmap, PLL_MODE(pll), &val);
> +
> +       /* Wait 5 us between setting BYPASS and deasserting reset */
> +       udelay(5);
> +
> +       /* Take PLL out from reset state */
> +       regmap_update_bits(regmap, PLL_MODE(pll), PLL_RESET_N, PLL_RESET_N);
> +       regmap_read(regmap, PLL_MODE(pll), &val);
> +
> +       /* Wait 50us for PLL_LOCK_DET bit to go high */

Is the bit not reliable or something? I'd expect to see a polling loop
here but it's a sleep.

> +       usleep_range(50, 55);