linux-kernel - Re: [PATCH v3 2/3] pwm: imx27: Use clk_bulk

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Message-ID: <7kplk52i7e2nha5ym4loza5oc3lwghifjfk3aut24w3hjagfk3@zusb2naeaevw>
Date: Tue, 22 Oct 2024 08:53:40 +0200
From: Uwe Kleine-König <u.kleine-koenig@...libre.com>
To: Frank Li <Frank.Li@....com>
Cc: Marek Vasut <marex@...x.de>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Shawn Guo <shawnguo@...nel.org>, Sascha Hauer <s.hauer@...gutronix.de>, 
	Pengutronix Kernel Team <kernel@...gutronix.de>, Fabio Estevam <festevam@...il.com>, 
	Philipp Zabel <p.zabel@...gutronix.de>, linux-pwm@...r.kernel.org, devicetree@...r.kernel.org, 
	imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org, 
	linux-kernel@...r.kernel.org, pratikmanvar09@...il.com, francesco@...cini.it
Subject: Re: [PATCH v3 2/3] pwm: imx27: Use clk_bulk_*() API to simplify
 clock handling

Hello,

On Tue, Sep 10, 2024 at 03:07:19PM -0400, Frank Li wrote:
> @@ -229,7 +209,7 @@ static int pwm_imx27_apply(struct pwm_chip *chip, struct pwm_device *pwm,
>  	int ret;
>  	u32 cr;
>  
> -	clkrate = clk_get_rate(imx->clk_per);
> +	clkrate = clk_get_rate(imx->clks[PWM_IMX27_PER].clk);
>  	c = clkrate * state->period;

Unrelated to this patch: clk_get_rate() should only be called on enabled
clocks. Given that further down in that function (see next hunk)
pwm_imx27_clk_prepare_enable() (or clk_bulk_prepare_enable()
respectively) is called, that clk might be off?!

>  	do_div(c, NSEC_PER_SEC);
> @@ -259,7 +239,7 @@ static int pwm_imx27_apply(struct pwm_chip *chip, struct pwm_device *pwm,
>  	if (pwm->state.enabled) {
>  		pwm_imx27_wait_fifo_slot(chip, pwm);
>  	} else {
> -		ret = pwm_imx27_clk_prepare_enable(imx);
> +		ret = clk_bulk_prepare_enable(imx->clks_cnt, imx->clks);
>  		if (ret)
>  			return ret;
>  

I applied just this patch to
https://git.kernel.org/pub/scm/linux/kernel/git/ukleinek/linux.git pwm/for-next
. The others are still under discussion, right?

I see you signed your patch (which is fine!), but I couldn't find your
key, neither on hkps://keys.openpgp.org/ nor on
hkps://keyserver.ubuntu.com nor in the kernel keyring. At least the
first two should be easy to fix.

Best regards
Uwe

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