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148 lines
4.2 KiB
148 lines
4.2 KiB
From 8c2057afe84c074ef7cd3ee2ec8e9bed835b9e93 Mon Sep 17 00:00:00 2001
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From: Sascha Hauer <s.hauer@pengutronix.de>
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Date: Wed, 21 May 2014 19:50:04 +0200
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Subject: [PATCH] mmc: Add SDIO function devicetree subnode parsing
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This adds SDIO devicetree subnode parsing to the mmc core. While
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SDIO devices are runtime probable they sometimes need nonprobable
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additional information on embedded systems, like an additional gpio
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interrupt or a clock. This patch makes it possible to supply this
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information from the devicetree. SDIO drivers will find a pointer
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to the devicenode in their devices of_node pointer.
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Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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[hdegoede@redhat.com: Misc. cleanups]
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Signed-off-by: Hans de Goede <hdegoede@redhat.com>
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---
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drivers/mmc/core/bus.c | 4 ++++
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drivers/mmc/core/core.c | 28 ++++++++++++++++++++++++++++
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drivers/mmc/core/core.h | 3 +++
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drivers/mmc/core/sdio_bus.c | 11 +++++++++++
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4 files changed, 46 insertions(+)
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diff --git a/drivers/mmc/core/bus.c b/drivers/mmc/core/bus.c
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index 8a1f124..7868565 100644
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--- a/drivers/mmc/core/bus.c
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+++ b/drivers/mmc/core/bus.c
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@@ -16,6 +16,7 @@
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#include <linux/err.h>
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#include <linux/slab.h>
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#include <linux/stat.h>
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+#include <linux/of.h>
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#include <linux/pm_runtime.h>
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#include <linux/mmc/card.h>
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@@ -352,6 +353,8 @@ int mmc_add_card(struct mmc_card *card)
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#endif
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mmc_init_context_info(card->host);
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+ card->dev.of_node = mmc_of_find_child_device(card->host, 0);
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+
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ret = device_add(&card->dev);
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if (ret)
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return ret;
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@@ -380,6 +383,7 @@ void mmc_remove_card(struct mmc_card *card)
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mmc_hostname(card->host), card->rca);
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}
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device_del(&card->dev);
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+ of_node_put(card->dev.of_node);
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}
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put_device(&card->dev);
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diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
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index f26a5f1..7f7f66c 100644
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--- a/drivers/mmc/core/core.c
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+++ b/drivers/mmc/core/core.c
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@@ -1205,6 +1205,34 @@ EXPORT_SYMBOL(mmc_of_parse_voltage);
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#endif /* CONFIG_OF */
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+static int mmc_of_get_func_num(struct device_node *node)
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+{
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+ u32 reg;
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+ int ret;
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+
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+ ret = of_property_read_u32(node, "reg", ®);
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+ if (ret < 0)
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+ return ret;
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+
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+ return reg;
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+}
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+
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+struct device_node *mmc_of_find_child_device(struct mmc_host *host,
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+ unsigned func_num)
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+{
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+ struct device_node *node;
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+
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+ if (!host->parent || !host->parent->of_node)
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+ return NULL;
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+
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+ for_each_child_of_node(host->parent->of_node, node) {
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+ if (mmc_of_get_func_num(node) == func_num)
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+ return node;
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+ }
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+
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+ return NULL;
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+}
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+
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#ifdef CONFIG_REGULATOR
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/**
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diff --git a/drivers/mmc/core/core.h b/drivers/mmc/core/core.h
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index 443a5846..f712f6e 100644
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--- a/drivers/mmc/core/core.h
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+++ b/drivers/mmc/core/core.h
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@@ -32,6 +32,9 @@ struct mmc_bus_ops {
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void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops);
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void mmc_detach_bus(struct mmc_host *host);
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+struct device_node *mmc_of_find_child_device(struct mmc_host *host,
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+ unsigned func_num);
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+
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void mmc_init_erase(struct mmc_card *card);
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void mmc_set_chip_select(struct mmc_host *host, int mode);
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diff --git a/drivers/mmc/core/sdio_bus.c b/drivers/mmc/core/sdio_bus.c
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index 6da97b1..f63223a 100644
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--- a/drivers/mmc/core/sdio_bus.c
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+++ b/drivers/mmc/core/sdio_bus.c
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@@ -22,7 +22,9 @@
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#include <linux/mmc/card.h>
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#include <linux/mmc/host.h>
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#include <linux/mmc/sdio_func.h>
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+#include <linux/of.h>
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+#include "core.h"
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#include "sdio_cis.h"
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#include "sdio_bus.h"
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@@ -303,6 +305,13 @@ static void sdio_acpi_set_handle(struct sdio_func *func)
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static inline void sdio_acpi_set_handle(struct sdio_func *func) {}
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#endif
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+static void sdio_set_of_node(struct sdio_func *func)
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+{
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+ struct mmc_host *host = func->card->host;
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+
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+ func->dev.of_node = mmc_of_find_child_device(host, func->num);
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+}
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+
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/*
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* Register a new SDIO function with the driver model.
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*/
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@@ -312,6 +321,7 @@ int sdio_add_func(struct sdio_func *func)
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dev_set_name(&func->dev, "%s:%d", mmc_card_id(func->card), func->num);
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+ sdio_set_of_node(func);
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sdio_acpi_set_handle(func);
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ret = device_add(&func->dev);
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if (ret == 0) {
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@@ -335,6 +345,7 @@ void sdio_remove_func(struct sdio_func *func)
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dev_pm_domain_detach(&func->dev, false);
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device_del(&func->dev);
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+ of_node_put(func->dev.of_node);
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put_device(&func->dev);
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}
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