linux-kernel - Re: [PATCH v2 2/2] mmc: sdhci-bcm2835: Actually enable the clock

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Date:	Thu, 04 Jun 2015 20:59:51 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Eric Anholt <eric@...olt.net>, Ulf Hansson <ulf.hansson@...aro.org>
CC:	linux-arm-kernel@...ts.infradead.org,
	linux-rpi-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Lee Jones <lee@...nel.org>, linux-mmc@...r.kernel.org
Subject: Re: [PATCH v2 2/2] mmc: sdhci-bcm2835: Actually enable the clock

On 05/29/2015 03:06 PM, Eric Anholt wrote:
> We're currently using a fixed frequency clock specified in the DT, so
> enabling is a no-op.  However, the RPi firmware-based clocks driver
> can actually disable unused clocks, so when switching to use it we
> ended up losing our MMC clock once all devices were probed.

> diff --git a/drivers/mmc/host/sdhci-bcm2835.c b/drivers/mmc/host/sdhci-bcm2835.c

> +	ret = clk_prepare_enable(pltfm_host->clk);
> +	if (ret) {
> +		dev_err(&pdev->dev, "failed to enable host clk\n");
> +		goto err;
> +	}

Given that pltfm_host is a "struct sdhci_pltfm_host" i.e. a type
defined/handled by sdhci-pltfm.c , I'm rather surprised that
sdhci-pltfm.c doesn't do this itself. Wouldn't it make sense for it to
do so?
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