linux-kernel - Re: [PATCH V3 2/7] clk: imx: fracn-gppll: disable hardware select control

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Message-ID: <ZDLBUsQ+YyWi98Hm@linaro.org>
Date:   Sun, 9 Apr 2023 16:44:50 +0300
From:   Abel Vesa <abel.vesa@...aro.org>
To:     "Peng Fan (OSS)" <peng.fan@....nxp.com>
Cc:     abelvesa@...nel.org, mturquette@...libre.com, sboyd@...nel.org,
        shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
        festevam@...il.com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, linux-imx@....com,
        linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        Peng Fan <peng.fan@....com>
Subject: Re: [PATCH V3 2/7] clk: imx: fracn-gppll: disable hardware select
 control

On 23-04-03 17:52:55, Peng Fan (OSS) wrote:
> From: Peng Fan <peng.fan@....com>
> 
> When programming PLL, should disable Hardware control select to make PLL
> controlled by register, not hardware inputs through OSCPLL.
> 
> Fixes: 1b26cb8a77a4 ("clk: imx: support fracn gppll")
> Signed-off-by: Peng Fan <peng.fan@....com>

Reviewed-by: Abel Vesa <abel.vesa@...aro.org>

> ---
>  drivers/clk/imx/clk-fracn-gppll.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/clk/imx/clk-fracn-gppll.c b/drivers/clk/imx/clk-fracn-gppll.c
> index ec50c41e2a4c..f6674110a88e 100644
> --- a/drivers/clk/imx/clk-fracn-gppll.c
> +++ b/drivers/clk/imx/clk-fracn-gppll.c
> @@ -15,6 +15,7 @@
>  #include "clk.h"
>  
>  #define PLL_CTRL		0x0
> +#define HW_CTRL_SEL		BIT(16)
>  #define CLKMUX_BYPASS		BIT(2)
>  #define CLKMUX_EN		BIT(1)
>  #define POWERUP_MASK		BIT(0)
> @@ -193,6 +194,11 @@ static int clk_fracn_gppll_set_rate(struct clk_hw *hw, unsigned long drate,
>  
>  	rate = imx_get_pll_settings(pll, drate);
>  
> +	/* Hardware control select disable. PLL is control by register */
> +	tmp = readl_relaxed(pll->base + PLL_CTRL);
> +	tmp &= ~HW_CTRL_SEL;
> +	writel_relaxed(tmp, pll->base + PLL_CTRL);
> +
>  	/* Disable output */
>  	tmp = readl_relaxed(pll->base + PLL_CTRL);
>  	tmp &= ~CLKMUX_EN;
> -- 
> 2.37.1
>