linux-kernel - Re: [PATCH V3] clk: imx: Fix reparenting of UARTs not associated with sdout

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Message-ID: <fbe03824-1397-c1f8-ac97-f500eaf60338@pengutronix.de>
Date:   Fri, 5 Mar 2021 13:21:33 +0100
From:   Ahmad Fatoum <a.fatoum@...gutronix.de>
To:     Adam Ford <aford173@...il.com>,
        linux-arm-kernel@...ts.infradead.org
Cc:     Aisheng Dong <aisheng.dong@....com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Fabio Estevam <festevam@...il.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        aford@...conembedded.com, linux-clk@...r.kernel.org,
        NXP Linux Team <linux-imx@....com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        linux-kernel@...r.kernel.org, Jerome Brunet <jbrunet@...libre.com>
Subject: Re: [PATCH V3] clk: imx: Fix reparenting of UARTs not associated with
 sdout

Hello Adam,

On 15.01.21 19:29, Adam Ford wrote:
>  {
> +#ifdef CONFIG_OF
>  	if (imx_keep_uart_clocks) {
>  		int i;
>  
> -		imx_uart_clocks = clks;
> -		for (i = 0; imx_uart_clocks[i]; i++)
> -			clk_prepare_enable(*imx_uart_clocks[i]);
> +		imx_uart_clocks = kcalloc(clk_count, sizeof(struct clk *), GFP_KERNEL);
> +		imx_enabled_uart_clocks = 0;
> +
> +		for (i = 0; i < clk_count; i++) {
> +			imx_uart_clocks[imx_enabled_uart_clocks] = of_clk_get(of_stdout, i);

of_stdout may be NULL if there is no stdout-path. You should check that earlier.

With this fixed, feel free to add:

Tested-by: Ahmad Fatoum <a.fatoum@...gutronix.de>

> +
> +			/* Stop if there are no more of_stdout references */
> +			if (IS_ERR(imx_uart_clocks[imx_enabled_uart_clocks]))
> +				return;
> +
> +			/* Only enable the clock if it's not NULL */
> +			if (imx_uart_clocks[imx_enabled_uart_clocks])
> +				clk_prepare_enable(imx_uart_clocks[imx_enabled_uart_clocks++]);
> +		}
>  	}
> +#else
> +	/* i.MX boards use device trees now.  For build tests without CONFIG_OF, do nothing */
> +	imx_enabled_uart_clocks = 0;
> +#endif
>  }
>  
>  static int __init imx_clk_disable_uart(void)
>  {
> -	if (imx_keep_uart_clocks && imx_uart_clocks) {
> +	if (imx_keep_uart_clocks && imx_enabled_uart_clocks) {
>  		int i;
>  
> -		for (i = 0; imx_uart_clocks[i]; i++)
> -			clk_disable_unprepare(*imx_uart_clocks[i]);
> +		for (i = 0; i < imx_enabled_uart_clocks; i++) {
> +			clk_disable_unprepare(imx_uart_clocks[i]);
> +			clk_put(imx_uart_clocks[i]);
> +		};
> +		kfree(imx_uart_clocks);
>  	}
>  
>  	return 0;
> diff --git a/drivers/clk/imx/clk.h b/drivers/clk/imx/clk.h
> index 4f04c8287286..7571603bee23 100644
> --- a/drivers/clk/imx/clk.h
> +++ b/drivers/clk/imx/clk.h
> @@ -11,9 +11,9 @@ extern spinlock_t imx_ccm_lock;
>  void imx_check_clocks(struct clk *clks[], unsigned int count);
>  void imx_check_clk_hws(struct clk_hw *clks[], unsigned int count);
>  #ifndef MODULE
> -void imx_register_uart_clocks(struct clk ** const clks[]);
> +void imx_register_uart_clocks(unsigned int clk_count);
>  #else
> -static inline void imx_register_uart_clocks(struct clk ** const clks[])
> +static inline void imx_register_uart_clocks(unsigned int clk_count)
>  {
>  }
>  #endif
> 

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