linux-kernel - Re: [PATCH] mmc: sdhci-esdhc-imx: Enable boot partition access from DT

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Date:	Wed, 3 Sep 2014 10:59:48 +0800
From:	Dong Aisheng <b29396@...escale.com>
To:	Jean-Michel Hautbois <jean-michel.hautbois@...alys.com>
CC:	<linux-mmc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<devicetree@...r.kernel.org>, <rmk+kernel@....linux.org.uk>,
	<shawn.guo@...aro.org>, <peter.griffin@...aro.org>,
	<tgih.jun@...sung.com>, <h80.chung@...sung.com>,
	<ulf.hansson@...aro.org>, <chris@...ntf.net>,
	<galak@...eaurora.org>, <ijc+devicetree@...lion.org.uk>,
	<mark.rutland@....com>, <pawel.moll@....com>, <robh+dt@...nel.org>
Subject: Re: [PATCH] mmc: sdhci-esdhc-imx: Enable boot partition access
 from DT

On Tue, Sep 02, 2014 at 05:49:37PM +0200, Jean-Michel Hautbois wrote:
> This property is useful when we don't want to access boot partitions on eMMC
> 

Any special reason why not access boot partitions on eMMC?
Not allow user to access it?

> Signed-off-by: Jean-Michel Hautbois <jean-michel.hautbois@...alys.com>
> ---
>  Documentation/devicetree/bindings/mmc/mmc.txt | 1 +
>  drivers/mmc/host/sdhci-esdhc-imx.c            | 8 ++++++++
>  include/linux/platform_data/mmc-esdhc-imx.h   | 1 +
>  3 files changed, 10 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/mmc/mmc.txt b/Documentation/devicetree/bindings/mmc/mmc.txt
> index 431716e..59cc854 100644
> --- a/Documentation/devicetree/bindings/mmc/mmc.txt
> +++ b/Documentation/devicetree/bindings/mmc/mmc.txt
> @@ -40,6 +40,7 @@ Optional properties:
>  - mmc-hs200-1_2v: eMMC HS200 mode(1.2V I/O) is supported
>  - mmc-hs400-1_8v: eMMC HS400 mode(1.8V I/O) is supported
>  - mmc-hs400-1_2v: eMMC HS400 mode(1.2V I/O) is supported
> +- no-boot-part : when preset, tells to access boot partitions

The file you changed is common mmc binding doc.
You may also want to add the support in mmc_of_parse.

And since sdhci-esdhc-imx is not using mmc_of_parse currently, maybe it's time
to convert to it.

Regards
Dong Aisheng

> 
>  *NOTE* on CD and WP polarity. To use common for all SD/MMC host controllers line
>  polarity properties, we have to fix the meaning of the "normal" and "inverted"
> diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
> index ccec0e3..439e663 100644
> --- a/drivers/mmc/host/sdhci-esdhc-imx.c
> +++ b/drivers/mmc/host/sdhci-esdhc-imx.c
> @@ -942,6 +942,11 @@ sdhci_esdhc_imx_probe_dt(struct platform_device *pdev,
> 	if (of_property_read_u32(np, "fsl,delay-line", &boarddata->delay_line))
> 		boarddata->delay_line = 0;
> 
> +	if (of_find_property(np, "no-boot-part", NULL))
> +		boarddata->access_boot_part = false;
> +	else
> +		boarddata->access_boot_part = true;
> +
> 	return 0;
>  }
>  #else
> @@ -1119,6 +1124,9 @@ static int sdhci_esdhc_imx_probe(struct platform_device *pdev)
> 		host->quirks2 |= SDHCI_QUIRK2_NO_1_8_V;
> 	}
> 
> +	if (!boarddata->access_boot_part)
> +		host->mmc->caps2 |= MMC_CAP2_BOOTPART_NOACC;
> +
> 	err = sdhci_add_host(host);
> 	if (err)
> 		goto disable_clk;
> diff --git a/include/linux/platform_data/mmc-esdhc-imx.h b/include/linux/platform_data/mmc-esdhc-imx.h
> index 75f70f6..a34ee9e 100644
> --- a/include/linux/platform_data/mmc-esdhc-imx.h
> +++ b/include/linux/platform_data/mmc-esdhc-imx.h
> @@ -46,5 +46,6 @@ struct esdhc_platform_data {
> 	unsigned int f_max;
> 	bool support_vsel;
> 	unsigned int delay_line;
> +	bool access_boot_part;
>  };
>  #endif /* __ASM_ARCH_IMX_ESDHC_H */
> 
> 2.0.4
> 
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