[PATCH v6 03/14] mmc: core: Add mmc-card dt sub-node parse in core layer
From: Gregory CLEMENT <hidden>
Date: 2017-02-14 17:02:40
Also in:
linux-arm-kernel, linux-clk, linux-mmc, lkml
Subsystem:
multimedia card (mmc), secure digital (sd) and sdio subsystem, the rest · Maintainers:
Ulf Hansson, Linus Torvalds
From: Hu Ziji <redacted> Some vendor host, like Xenon, can support multiple types. In dts, use mmc-card dt sub-node to indicate eMMC is in use. Add a generic mmc-card parse function in mmc core layer. If mmc-card sub-node is detected, set eMMC common caps, such as MMC_CAP_NONREMOVABLE, MMC_CAP2_NO_SD and MMC_CAP2_NO_SDIO. Since it is likely that struct mmc_card is not allocated yet when this mmc-card parse function is called, it will return true if mmc-card sub-node is detected. Otherwise, return false. It can help vendor host determine if the card type is eMMC. Signed-off-by: Hu Ziji <redacted> Signed-off-by: Gregory CLEMENT <gregory.clement-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org> --- drivers/mmc/core/mmc.c | 24 ++++++++++++++++++++++++ include/linux/mmc/core.h | 2 ++ 2 files changed, 26 insertions(+)
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index b61b52f9da3d..dc480006a303 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c@@ -2111,6 +2111,30 @@ static const struct mmc_bus_ops mmc_ops = { }; /* + * Parse mmc-card dt sub-node and set eMMC common caps + * if mmc-card exists. + * If mmc-card is detected, return true. + * Otherwise, return false. + */ +bool mmc_of_parse_mmc_card(struct mmc_host *host) +{ + struct device_node *np; + bool ret = false; + + np = mmc_of_find_child_device(host, 0); + if (np && of_device_is_compatible(np, "mmc-card")) { + /* mmc-card sub-node indicates eMMC card is in use. */ + host->caps |= MMC_CAP_NONREMOVABLE; + host->caps2 |= MMC_CAP2_NO_SDIO | MMC_CAP2_NO_SD; + ret = true; + } + + of_node_put(np); + return ret; +} +EXPORT_SYMBOL_GPL(mmc_of_parse_mmc_card); + +/* * Starting point for MMC card init. */ int mmc_attach_mmc(struct mmc_host *host)
diff --git a/include/linux/mmc/core.h b/include/linux/mmc/core.h
index e33cc748dcfe..1b27323f3b6e 100644
--- a/include/linux/mmc/core.h
+++ b/include/linux/mmc/core.h@@ -234,4 +234,6 @@ struct device_node; extern u32 mmc_vddrange_to_ocrmask(int vdd_min, int vdd_max); extern int mmc_of_parse_voltage(struct device_node *np, u32 *mask); +extern bool mmc_of_parse_mmc_card(struct mmc_host *host); + #endif /* LINUX_MMC_CORE_H */
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git-series 0.9.1
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