linux-kernel - Re: [PATCH v4 2/7] mmc: mediatek: Add Mediatek MMC driver

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Date:	Tue, 19 May 2015 13:15:58 +0200
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	Chaotian Jing <chaotian.jing@...iatek.com>
Cc:	Rob Herring <robh+dt@...nel.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Chris Ball <chris@...ntf.net>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Mark Rutland <mark.rutland@....com>,
	James Liao <jamesjj.liao@...iatek.com>,
	srv_heupstream@...iatek.com, Arnd Bergmann <arnd@...db.de>,
	devicetree@...r.kernel.org,
	Hongzhou Yang <hongzhou.yang@...iatek.com>,
	Catalin Marinas <catalin.marinas@....com>,
	bin.zhang@...iatek.com, linux-mmc@...r.kernel.org,
	linux-kernel@...r.kernel.org, Will Deacon <will.deacon@....com>,
	linux-gpio@...r.kernel.org, linux-mediatek@...ts.infradead.org,
	Sascha Hauer <kernel@...gutronix.de>,
	"Joe.C" <yingjoe.chen@...iatek.com>,
	Eddie Huang <eddie.huang@...iatek.com>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v4 2/7] mmc: mediatek: Add Mediatek MMC driver

On Tue, May 19, 2015 at 02:36:46PM +0800, Chaotian Jing wrote:
> Add Mediatek MMC driver code
> Support eMMC/SD/SDIO
> 
> Signed-off-by: Chaotian Jing <chaotian.jing@...iatek.com>
> ---
>  drivers/mmc/host/Kconfig  |    8 +
>  drivers/mmc/host/Makefile |    1 +
>  drivers/mmc/host/mtk-sd.c | 1422 +++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 1431 insertions(+)
>  create mode 100644 drivers/mmc/host/mtk-sd.c
> 
> +
> +	host->src_clk = devm_clk_get(&pdev->dev, "source");
> +	if (IS_ERR(host->src_clk)) {
> +		ret = PTR_ERR(host->src_clk);
> +		goto host_free;
> +	}
> +
> +	host->h_clk = devm_clk_get(&pdev->dev, "hclk");
> +	if (IS_ERR(host->h_clk)) {
> +		/* host->h_clk is optional, Only for MSDC0/3 at MT8173 */
> +		dev_dbg(&pdev->dev,
> +				"Invalied hclk from the device tree!\n");
> +	}

s/Invalied/Invalid/

According to my reference manual the controller always needs a hclk. It
seems on some controllers it is just not software controllable. If
that's the case you should always provide a hclk to the driver and make
this clock mandatory.

Sascha

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