mmc: provide a standard MMC device-tree binding parser centrally

MMC defines a number of standard DT bindings. Having each driver parse
them individually adds code redundancy and is error prone. Provide a
standard function to unify the parsing. After all drivers are converted
to using it instead of their own parsers, this function can be integrated
into mmc_alloc_host().

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Chris Ball <cjb@laptop.org>

diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c
index ee2e16b170174df6e59c0d53a314d0058ddaff2a..9c53452e73e17078920e6b885e973fc3b341f0fb 100644 (file)
--- a/drivers/mmc/core/host.c
+++ b/drivers/mmc/core/host.c
@@ -15,6 +15,8 @@
 #include <linux/device.h>
 #include <linux/err.h>
 #include <linux/idr.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
 #include <linux/pagemap.h>
 #include <linux/export.h>
 #include <linux/leds.h>
@@ -23,6 +25,7 @@
 
 #include <linux/mmc/host.h>
 #include <linux/mmc/card.h>
+#include <linux/mmc/slot-gpio.h>
 
 #include "core.h"
 #include "host.h"
@@ -294,6 +297,113 @@ static inline void mmc_host_clk_sysfs_init(struct mmc_host *host)
 
 #endif
 
+/**
+ *     mmc_of_parse() - parse host's device-tree node
+ *     @host: host whose node should be parsed.
+ *
+ * To keep the rest of the MMC subsystem unaware of whether DT has been
+ * used to to instantiate and configure this host instance or not, we
+ * parse the properties and set respective generic mmc-host flags and
+ * parameters.
+ */
+void mmc_of_parse(struct mmc_host *host)
+{
+       struct device_node *np;
+       u32 bus_width;
+       bool explicit_inv_wp, gpio_inv_wp = false;
+       enum of_gpio_flags flags;
+       int len, ret, gpio;
+
+       if (!host->parent || !host->parent->of_node)
+               return;
+
+       np = host->parent->of_node;
+
+       /* "bus-width" is translated to MMC_CAP_*_BIT_DATA flags */
+       if (of_property_read_u32(np, "bus-width", &bus_width) < 0) {
+               dev_dbg(host->parent,
+                       "\"bus-width\" property is missing, assuming 1 bit.\n");
+               bus_width = 1;
+       }
+
+       switch (bus_width) {
+       case 8:
+               host->caps |= MMC_CAP_8_BIT_DATA;
+               /* Hosts capable of 8-bit transfers can also do 4 bits */
+       case 4:
+               host->caps |= MMC_CAP_4_BIT_DATA;
+               break;
+       case 1:
+               break;
+       default:
+               dev_err(host->parent,
+                       "Invalid \"bus-width\" value %ud!\n", bus_width);
+       }
+
+       /* f_max is obtained from the optional "max-frequency" property */
+       of_property_read_u32(np, "max-frequency", &host->f_max);
+
+       /*
+        * Configure CD and WP pins. They are both by default active low to
+        * match the SDHCI spec. If GPIOs are provided for CD and / or WP, the
+        * mmc-gpio helpers are used to attach, configure and use them. If
+        * polarity inversion is specified in DT, one of MMC_CAP2_CD_ACTIVE_HIGH
+        * and MMC_CAP2_RO_ACTIVE_HIGH capability-2 flags is set. If the
+        * "broken-cd" property is provided, the MMC_CAP_NEEDS_POLL capability
+        * is set. If the "non-removable" property is found, the
+        * MMC_CAP_NONREMOVABLE capability is set and no card-detection
+        * configuration is performed.
+        */
+
+       /* Parse Card Detection */
+       if (of_find_property(np, "non-removable", &len)) {
+               host->caps |= MMC_CAP_NONREMOVABLE;
+       } else {
+               bool explicit_inv_cd, gpio_inv_cd = false;
+
+               explicit_inv_cd = of_property_read_bool(np, "cd-inverted");
+
+               if (of_find_property(np, "broken-cd", &len))
+                       host->caps |= MMC_CAP_NEEDS_POLL;
+
+               gpio = of_get_named_gpio_flags(np, "cd-gpios", 0, &flags);
+               if (gpio_is_valid(gpio)) {
+                       if (!(flags & OF_GPIO_ACTIVE_LOW))
+                               gpio_inv_cd = true;
+
+                       ret = mmc_gpio_request_cd(host, gpio);
+                       if (ret < 0)
+                               dev_err(host->parent,
+                                       "Failed to request CD GPIO #%d: %d!\n",
+                                       gpio, ret);
+                       else
+                               dev_info(host->parent, "Got CD GPIO #%d.\n",
+                                        gpio);
+               }
+
+               if (explicit_inv_cd ^ gpio_inv_cd)
+                       host->caps2 |= MMC_CAP2_CD_ACTIVE_HIGH;
+       }
+
+       /* Parse Write Protection */
+       explicit_inv_wp = of_property_read_bool(np, "wp-inverted");
+
+       gpio = of_get_named_gpio_flags(np, "wp-gpios", 0, &flags);
+       if (gpio_is_valid(gpio)) {
+               if (!(flags & OF_GPIO_ACTIVE_LOW))
+                       gpio_inv_wp = true;
+
+               ret = mmc_gpio_request_ro(host, gpio);
+               if (ret < 0)
+                       dev_err(host->parent,
+                               "Failed to request WP GPIO: %d!\n", ret);
+       }
+       if (explicit_inv_wp ^ gpio_inv_wp)
+               host->caps2 |= MMC_CAP2_RO_ACTIVE_HIGH;
+}
+
+EXPORT_SYMBOL(mmc_of_parse);
+
 /**
  *     mmc_alloc_host - initialise the per-host structure.
  *     @extra: sizeof private data structure

diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index fd5fd5a6026f8420d3d674c2429c5d98ac364938..bf93c9a6d7291f7a454b8fe19bd66b4f7006a1e0 100644 (file)
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -368,6 +368,7 @@ extern struct mmc_host *mmc_alloc_host(int extra, struct device *);
 extern int mmc_add_host(struct mmc_host *);
 extern void mmc_remove_host(struct mmc_host *);
 extern void mmc_free_host(struct mmc_host *);
+void mmc_of_parse(struct mmc_host *host);
 
 static inline void *mmc_priv(struct mmc_host *host)
 {