linux-kernel - Re: [PATCH 06/10] mmc: dw_mmc-pltfm: add Rockchip variant

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Message-id: <51AD67CF.60300@samsung.com>
Date:	Tue, 04 Jun 2013 13:06:39 +0900
From:	Jaehoon Chung <jh80.chung@...sung.com>
To:	Heiko Stübner <heiko@...ech.de>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Mike Turquette <mturquette@...aro.org>,
	Arnd Bergmann <arnd@...db.de>,
	Seungwon Jeon <tgih.jun@...sung.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	linux-mmc@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Rob Herring <rob.herring@...xeda.com>,
	Jaehoon Chung <jh80.chung@...sung.com>,
	Olof Johansson <olof@...om.net>,
	John Stultz <john.stultz@...aro.org>,
	Grant Likely <grant.likely@...aro.org>,
	Russell King <linux@....linux.org.uk>,
	Thomas Gleixner <tglx@...utronix.de>,
	Chris Ball <cjb@...top.org>,
	devicetree-discuss@...ts.ozlabs.org
Subject: Re: [PATCH 06/10] mmc: dw_mmc-pltfm: add Rockchip variant

On 06/03/2013 07:59 AM, Heiko Stübner wrote:
> Cortex-A9 SoCs from Rockchip use a slightly modified variant of dw_mmc
> controllers that seems to require the SDMMC_CMD_USE_HOLD_REG bit to
> always be set.
> 
> There also seem to be no other modifications (additional register etc)
> present, so to keep the footprint low, add this small variant to the
> pltfm driver.
> 
> Signed-off-by: Heiko Stuebner <heiko@...ech.de>
> ---
>  drivers/mmc/host/dw_mmc-pltfm.c |   48 +++++++++++++++++++++++++++-----------
>  1 files changed, 34 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/mmc/host/dw_mmc-pltfm.c b/drivers/mmc/host/dw_mmc-pltfm.c
> index 0048da8..7d041b5 100644
> --- a/drivers/mmc/host/dw_mmc-pltfm.c
> +++ b/drivers/mmc/host/dw_mmc-pltfm.c
> @@ -24,6 +24,16 @@
>  
>  #include "dw_mmc.h"
>  
> +
> +static void dw_mci_rockchip_prepare_command(struct dw_mci *host, u32 *cmdr)
How about using "dw_mci_pltfm_prepare_command()"?
Maybe HOLD_REG could be used at other SoC.
> +{
> +	*cmdr |= SDMMC_CMD_USE_HOLD_REG;
> +}
> +
> +static const struct dw_mci_drv_data rockchip_drv_data = {
> +	.prepare_command	= dw_mci_rockchip_prepare_command,
> +};
> +
>  int dw_mci_pltfm_register(struct platform_device *pdev,
>  				const struct dw_mci_drv_data *drv_data)
>  {
> @@ -63,20 +73,6 @@ int dw_mci_pltfm_register(struct platform_device *pdev,
>  }
>  EXPORT_SYMBOL_GPL(dw_mci_pltfm_register);
>  
> -static int dw_mci_pltfm_probe(struct platform_device *pdev)
> -{
> -	return dw_mci_pltfm_register(pdev, NULL);
> -}
> -
> -int dw_mci_pltfm_remove(struct platform_device *pdev)
> -{
> -	struct dw_mci *host = platform_get_drvdata(pdev);
> -
> -	dw_mci_remove(host);
> -	return 0;
> -}
> -EXPORT_SYMBOL_GPL(dw_mci_pltfm_remove);
> -
>  #ifdef CONFIG_PM_SLEEP
>  /*
>   * TODO: we should probably disable the clock to the card in the suspend path.
> @@ -114,10 +110,34 @@ EXPORT_SYMBOL_GPL(dw_mci_pltfm_pmops);
>  
>  static const struct of_device_id dw_mci_pltfm_match[] = {
>  	{ .compatible = "snps,dw-mshc", },
> +	{ .compatible = "rockchip,cortex-a9-dw-mshc",
> +		.data = &rockchip_drv_data },
>  	{},
>  };
>  MODULE_DEVICE_TABLE(of, dw_mci_pltfm_match);
>  
> +static int dw_mci_pltfm_probe(struct platform_device *pdev)
> +{
> +	const struct dw_mci_drv_data *drv_data = NULL;
> +	const struct of_device_id *match;
> +
> +	if (pdev->dev.of_node) {
> +		match = of_match_node(dw_mci_pltfm_match, pdev->dev.of_node);
> +		drv_data = match->data;
> +	}
> +
> +	return dw_mci_pltfm_register(pdev, drv_data);
> +}
> +
> +int dw_mci_pltfm_remove(struct platform_device *pdev)
> +{
> +	struct dw_mci *host = platform_get_drvdata(pdev);
> +
> +	dw_mci_remove(host);
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(dw_mci_pltfm_remove);
> +
>  static struct platform_driver dw_mci_pltfm_driver = {
>  	.probe		= dw_mci_pltfm_probe,
>  	.remove		= dw_mci_pltfm_remove,
> 

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