linux-kernel - Re: [PATCH 3/4] mmc: mediatek: Add tune support

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Date:	Thu, 15 Oct 2015 08:29:58 +0200
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	Chaotian Jing <chaotian.jing@...iatek.com>
Cc:	Ulf Hansson <ulf.hansson@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Hans de Goede <hdegoede@...hat.com>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Javier Martinez Canillas <javier.martinez@...labora.co.uk>,
	Howard Chen <ibanezchen@...il.com>,
	Daniel Kurtz <djkurtz@...omium.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Kristina Martsenko <kristina.martsenko@...il.com>,
	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org, linux-mmc@...r.kernel.org,
	srv_heupstream@...iatek.com
Subject: Re: [PATCH 3/4] mmc: mediatek: Add tune support

Hi,

On Tue, Oct 13, 2015 at 05:37:57PM +0800, Chaotian Jing wrote:
> @@ -1260,6 +1547,16 @@ static int msdc_drv_probe(struct platform_device *pdev)
>  		goto host_free;
>  	}
>  
> +	host->src_clk_parent = clk_get_parent(host->src_clk);
> +	host->hs400_src = devm_clk_get(&pdev->dev, "400mhz");
> +	if (IS_ERR(host->hs400_src)) {
> +		dev_dbg(&pdev->dev, "Cannot find 400mhz at dts!\n");
> +	} else if (clk_set_parent(host->src_clk_parent, host->hs400_src) < 0) {
> +		dev_err(host->dev, "Failed to set 400mhz source clock!\n");
> +		ret = -EINVAL;
> +		goto host_free;
> +	}

This is a static setup. We have device tree bindings for doing this.
Please look for assigned-clocks and assigned-clock-parents. Doing stuff
like this in the driver almost certainly leads to problems because the
next SoC will have different requirements here.

Sascha

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