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Subject[PATCH 2/3] mmc: davinci_mmc: add DT support
Date
Adds device tree support for davinci_mmc. Also add
binding documentation.
Tested with non-dma PIO mode and without GPIO
card_detect/write_protect option because of
dependencies on EDMA and GPIO modules DT support.

Signed-off-by: Manjunathappa, Prakash <prakash.pm@ti.com>
Cc: linux-mmc@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Cc: davinci-linux-open-source@linux.davincidsp.com
Cc: devicetree-discuss@lists.ozlabs.org
Cc: cjb@laptop.org
Cc: Sekhar Nori <nsekhar@ti.com>
Cc: mporter@ti.com
---
.../devicetree/bindings/mmc/davinci_mmc.txt | 23 +++++++
drivers/mmc/host/davinci_mmc.c | 69 +++++++++++++++++++-
2 files changed, 91 insertions(+), 1 deletions(-)
create mode 100644 Documentation/devicetree/bindings/mmc/davinci_mmc.txt

diff --git a/Documentation/devicetree/bindings/mmc/davinci_mmc.txt b/Documentation/devicetree/bindings/mmc/davinci_mmc.txt
new file mode 100644
index 0000000..144bee6
--- /dev/null
+++ b/Documentation/devicetree/bindings/mmc/davinci_mmc.txt
@@ -0,0 +1,23 @@
+* TI Highspeed MMC host controller for DaVinci
+
+The Highspeed MMC Host Controller on TI DaVinci family
+provides an interface for MMC, SD and SDIO types of memory cards.
+
+This file documents differences between the core properties described
+by mmc.txt and the properties used by the davinci_mmc driver.
+
+Required properties:
+- compatible:
+ Should be "ti,davinci_mmc", for davinci controllers
+
+Optional properties:
+- bus-width: Number of data lines, can be <1>, <4>, or <8>, default <1>
+- max-frequency: maximum operating clock frequency.
+- caps: Check for Host capabilities in <linux/mmc/host.h>
+- version: version of controller.
+Example:
+ mmc1: mmc@0x4809c000 {
+ compatible = "ti,omap4-hsmmc";
+ reg = <0x4809c000 0x400>;
+ bus-width = <4>;
+ };
diff --git a/drivers/mmc/host/davinci_mmc.c b/drivers/mmc/host/davinci_mmc.c
index 382b79d..ce6730d 100644
--- a/drivers/mmc/host/davinci_mmc.c
+++ b/drivers/mmc/host/davinci_mmc.c
@@ -34,6 +34,7 @@
#include <linux/dma-mapping.h>
#include <linux/edma.h>
#include <linux/mmc/mmc.h>
+#include <linux/of.h>

#include <linux/platform_data/mmc-davinci.h>

@@ -1156,16 +1157,75 @@ static void __init init_mmcsd_host(struct mmc_davinci_host *host)

mmc_davinci_reset_ctrl(host, 0);
}
+#ifdef CONFIG_OF
+static struct davinci_mmc_config
+ *mmc_of_get_pdata(struct platform_device *pdev)
+{
+ struct device_node *np;
+ struct davinci_mmc_config *pdata = NULL;
+ u32 data;
+ int ret;
+
+ pdata = pdev->dev.platform_data;
+ if (!pdata) {
+ pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata) {
+ dev_err(&pdev->dev, "Failed to allocate memory for struct davinci_mmc_config\n");
+ goto nodata;
+ }
+ }
+
+ np = pdev->dev.of_node;
+ if (!np)
+ goto nodata;
+
+ ret = of_property_read_u32(np, "bus-width", &data);
+ if (ret)
+ dev_info(&pdev->dev, "wires not specified, defaulting to 4 bit mode\n");
+ pdata->wires = data;
+
+ ret = of_property_read_u32(np, "max-frequency", &data);
+ if (ret)
+ dev_info(&pdev->dev, "max-frequency not specified, defaulting to 25MHz\n");
+ pdata->max_freq = data;
+
+ ret = of_property_read_u32(np, "caps", &data);
+ if (ret)
+ dev_info(&pdev->dev, "card capability not specified\n");
+ pdata->caps = data;
+
+ ret = of_property_read_u32(np, "version", &data);
+ if (ret)
+ dev_err(&pdev->dev, "version not specified\n");
+ pdata->version = data;
+
+nodata:
+ return pdata;
+}
+
+#else
+static struct davinci_mmc_config
+ *mmc_of_get_pdata(struct platform_device *pdev)
+{
+ return pdev->dev.platform_data;
+}
+#endif

static int __init davinci_mmcsd_probe(struct platform_device *pdev)
{
- struct davinci_mmc_config *pdata = pdev->dev.platform_data;
+ struct davinci_mmc_config *pdata = NULL;
struct mmc_davinci_host *host = NULL;
struct mmc_host *mmc = NULL;
struct resource *r, *mem = NULL;
int ret = 0, irq = 0;
size_t mem_size;

+ pdata = mmc_of_get_pdata(pdev);
+ if (pdata == NULL) {
+ dev_err(&pdev->dev, "Can not get platform data\n");
+ return -ENOENT;
+ }
+
/* REVISIT: when we're fully converted, fail if pdata is NULL */

ret = -ENODEV;
@@ -1403,11 +1463,18 @@ static const struct dev_pm_ops davinci_mmcsd_pm = {
#define davinci_mmcsd_pm_ops NULL
#endif

+static const struct of_device_id davinci_mmc_of_match[] = {
+ {.compatible = "ti,davinci_mmc", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, davinci_mmc_of_match);
+
static struct platform_driver davinci_mmcsd_driver = {
.driver = {
.name = "davinci_mmc",
.owner = THIS_MODULE,
.pm = davinci_mmcsd_pm_ops,
+ .of_match_table = of_match_ptr(davinci_mmc_of_match),
},
.remove = __exit_p(davinci_mmcsd_remove),
};
--
1.7.4.1


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