linux-kernel - Re: [PATCH] mmc: sdhci-of-arasan: Get quirks from device tree

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Message-ID: <55B64BFF.8030909@metafoo.de>
Date:	Mon, 27 Jul 2015 17:19:27 +0200
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Shawn Lin <shawn.lin@...k-chips.com>,
	Ulf Hansson <ulf.hansson@...aro.org>
CC:	Sören Brinkmann <soren.brinkmann@...inx.com>,
	Michal Simek <michal.simek@...inx.com>,
	linux-arm-kernel@...ts.infradead.org, linux-mmc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mmc: sdhci-of-arasan: Get quirks from device tree

On 07/27/2015 10:04 AM, Shawn Lin wrote:
> This patch adds the interface to get quirks from dts, and
> there is no need to assign different quirks by condition statement
> of arasan IP version.
>
> Signed-off-by: Shawn Lin <shawn.lin@...k-chips.com>
> ---
>
>   drivers/mmc/host/sdhci-of-arasan.c | 7 +++++++
>   1 file changed, 7 insertions(+)
>
> diff --git a/drivers/mmc/host/sdhci-of-arasan.c b/drivers/mmc/host/sdhci-of-arasan.c
> index ef5a7d2..db07788 100644
> --- a/drivers/mmc/host/sdhci-of-arasan.c
> +++ b/drivers/mmc/host/sdhci-of-arasan.c
> @@ -132,6 +132,7 @@ static SIMPLE_DEV_PM_OPS(sdhci_arasan_dev_pm_ops, sdhci_arasan_suspend,
>   static int sdhci_arasan_probe(struct platform_device *pdev)
>   {
>   	int ret;
> +	u32 quirktab[2];
>   	struct clk *clk_xin;
>   	struct sdhci_host *host;
>   	struct sdhci_pltfm_host *pltfm_host;
> @@ -172,6 +173,12 @@ static int sdhci_arasan_probe(struct platform_device *pdev)
>   		goto clk_disable_all;
>   	}
>
> +	if (of_property_read_u32_array(pdev->dev.of_node,
> +				       "arasan,quirks", &quirktab[0], 2)) {
> +		host->quirks |= quirktab[0];
> +		host->quirks2 |= quirktab[1];
> +	}

The quirks are part of the Linux internal API, making them part of the 
public ABI is not necessarily the best idea. It means they become fixed, you 
can't remove any quirk types, can't change any quirk type, nor can add new 
quirk types.

- Lars

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