From: Sascha Hauer <s.hauer@pengutronix.de>
To: barebox@lists.infradead.org
Cc: Juergen Beisert <jbe@pengutronix.de>
Subject: [PATCH 5/6] mci: Add devicetree helper function
Date: Fri, 31 May 2013 09:14:02 +0200 [thread overview]
Message-ID: <1369984443-8790-5-git-send-email-s.hauer@pengutronix.de> (raw)
In-Reply-To: <1369984443-8790-1-git-send-email-s.hauer@pengutronix.de>
This adds helper code to parse the bus-width and max-frequency
property from devicetree.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
drivers/mci/mci-core.c | 38 ++++++++++++++++++++++++++++++++++++++
include/mci.h | 1 +
2 files changed, 39 insertions(+)
diff --git a/drivers/mci/mci-core.c b/drivers/mci/mci-core.c
index 54660dc..5209d1c 100644
--- a/drivers/mci/mci-core.c
+++ b/drivers/mci/mci-core.c
@@ -1649,3 +1649,41 @@ err_free:
return ret;
}
+
+void mci_of_parse(struct mci_host *host)
+{
+ struct device_node *np;
+ u32 bus_width;
+
+ if (!IS_ENABLED(CONFIG_OFDEVICE))
+ return;
+
+ if (!host->hw_dev || !host->hw_dev->device_node)
+ return;
+
+ np = host->hw_dev->device_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->hw_dev,
+ "\"bus-width\" property is missing, assuming 1 bit.\n");
+ bus_width = 1;
+ }
+
+ switch (bus_width) {
+ case 8:
+ host->host_caps |= MMC_MODE_8BIT;
+ /* Hosts capable of 8-bit transfers can also do 4 bits */
+ case 4:
+ host->host_caps |= MMC_MODE_4BIT;
+ break;
+ case 1:
+ break;
+ default:
+ dev_err(host->hw_dev,
+ "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);
+}
diff --git a/include/mci.h b/include/mci.h
index 2b87691..70df641 100644
--- a/include/mci.h
+++ b/include/mci.h
@@ -362,5 +362,6 @@ struct mci {
};
int mci_register(struct mci_host*);
+void mci_of_parse(struct mci_host *host);
#endif /* _MCI_H_ */
--
1.8.2.rc2
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next prev parent reply other threads:[~2013-05-31 7:14 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-31 7:13 [PATCH 1/6] mci: print current clock in info Sascha Hauer
2013-05-31 7:13 ` [PATCH 2/6] mci: do not limit clock to card capabilities Sascha Hauer
2013-05-31 7:30 ` Juergen Beisert
2013-05-31 7:14 ` [PATCH 3/6] mci: rename trans_speed field to csd_max_dtr Sascha Hauer
2013-05-31 7:35 ` Juergen Beisert
2013-05-31 7:14 ` [PATCH 4/6] mci: Use csd_max_dtr when appropriate Sascha Hauer
2013-05-31 7:37 ` Juergen Beisert
2013-05-31 7:14 ` Sascha Hauer [this message]
2013-05-31 7:14 ` [PATCH 6/6] mci: i.MX esdhc: get additional parameters from devicetree Sascha Hauer
2013-05-31 7:33 ` [PATCH 1/6] mci: print current clock in info Juergen Beisert
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