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

Jean-Michel Hautbois
2014-09-02T15:50:01Z

This property is useful when we don't want to access boot partitions on eMMC

Signed-off-by: Jean-Michel Hautbois <jean-michel.hautbois@vodalys.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

*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