[PATCH 20/36] mtd: onenand: omap: Clean up device tree support
From: Roger Quadros
Date: Wed Jun 11 2014 - 05:06:18 EST
Move OneNAND specific device tree parsing to NAND driver.
The OneNAND device node must have its own compatible id.
Add a new property 'ti,onenand-sync-rw' to indicate
synchronous read + write support. Default mode would be
only synchronous reads.
Signed-off-by: Roger Quadros <rogerq@xxxxxx>
---
.../devicetree/bindings/mtd/gpmc-onenand.txt | 4 +
arch/arm/mach-omap2/gpmc-onenand.c | 14 ----
arch/arm/mach-omap2/gpmc.c | 55 +++----------
drivers/mtd/onenand/omap2.c | 90 ++++++++++++++++------
include/linux/platform_data/mtd-onenand-omap2.h | 4 +-
5 files changed, 84 insertions(+), 83 deletions(-)
diff --git a/Documentation/devicetree/bindings/mtd/gpmc-onenand.txt b/Documentation/devicetree/bindings/mtd/gpmc-onenand.txt
index b752942..7fc9c13 100644
--- a/Documentation/devicetree/bindings/mtd/gpmc-onenand.txt
+++ b/Documentation/devicetree/bindings/mtd/gpmc-onenand.txt
@@ -9,9 +9,12 @@ Documentation/devicetree/bindings/bus/ti-gpmc.txt
Required properties:
+ - compatible: "ti,omap2-onenand"
- reg: The CS line the peripheral is connected to
- gpmc,device-width Width of the ONENAND device connected to the GPMC
in bytes. Must be 1 or 2.
+ - ti,onenand-sync-rw: Bool. Enable synchronous Read and Write. If not
+ present, only Synchronous Read is enabled.
Optional properties:
@@ -35,6 +38,7 @@ Example for an OMAP3430 board:
#size-cells = <1>;
onenand@0 {
+ compatible = "ti,omap2-onenand"
reg = <0 0 0>; /* CS0, offset 0 */
gpmc,device-width = <2>;
diff --git a/arch/arm/mach-omap2/gpmc-onenand.c b/arch/arm/mach-omap2/gpmc-onenand.c
index d09c342..37ed4f1 100644
--- a/arch/arm/mach-omap2/gpmc-onenand.c
+++ b/arch/arm/mach-omap2/gpmc-onenand.c
@@ -75,20 +75,6 @@ static int omap2_onenand_setup_async(struct omap_onenand_platform_data
struct gpmc_device_timings dev_t;
int ret;
- if (gpmc_onenand_data->of_node) {
- gpmc_read_settings_dt(gpmc_onenand_data->of_node,
- &onenand_async);
- if (onenand_async.sync_read || onenand_async.sync_write) {
- if (onenand_async.sync_write)
- gpmc_onenand_data->flags |=
- ONENAND_SYNC_READWRITE;
- else
- gpmc_onenand_data->flags |= ONENAND_SYNC_READ;
- onenand_async.sync_read = false;
- onenand_async.sync_write = false;
- }
- }
-
ret = gpmc_cs_program_settings(gpmc_onenand_data->cs, &onenand_async);
if (ret < 0)
return ret;
diff --git a/arch/arm/mach-omap2/gpmc.c b/arch/arm/mach-omap2/gpmc.c
index 50ef1a9..ee030cd 100644
--- a/arch/arm/mach-omap2/gpmc.c
+++ b/arch/arm/mach-omap2/gpmc.c
@@ -39,7 +39,6 @@
#include "common.h"
#include "omap_device.h"
#include "gpmc.h"
-#include "gpmc-onenand.h"
#define DEVICE_NAME "omap-gpmc"
@@ -1166,43 +1165,6 @@ static void __maybe_unused gpmc_read_timings_dt(struct device_node *np,
of_property_read_bool(np, "gpmc,time-para-granularity");
}
-#if IS_ENABLED(CONFIG_MTD_ONENAND)
-static int gpmc_probe_onenand_child(struct platform_device *pdev,
- struct device_node *child)
-{
- u32 val;
- struct omap_onenand_platform_data *gpmc_onenand_data;
-
- if (of_property_read_u32(child, "reg", &val) < 0) {
- dev_err(&pdev->dev, "%s has no 'reg' property\n",
- child->full_name);
- return -ENODEV;
- }
-
- gpmc_onenand_data = devm_kzalloc(&pdev->dev, sizeof(*gpmc_onenand_data),
- GFP_KERNEL);
- if (!gpmc_onenand_data)
- return -ENOMEM;
-
- gpmc_onenand_data->cs = val;
- gpmc_onenand_data->of_node = child;
- gpmc_onenand_data->dma_channel = -1;
-
- if (!of_property_read_u32(child, "dma-channel", &val))
- gpmc_onenand_data->dma_channel = val;
-
- gpmc_onenand_init(gpmc_onenand_data);
-
- return 0;
-}
-#else
-static int gpmc_probe_onenand_child(struct platform_device *pdev,
- struct device_node *child)
-{
- return 0;
-}
-#endif
-
/**
* gpmc_probe_generic_child - configures the gpmc for a child device
* @pdev: pointer to gpmc platform device
@@ -1292,6 +1254,12 @@ static int gpmc_probe_generic_child(struct platform_device *pdev,
}
gpmc_s.device_nand = true;
+
+ } else if (of_node_cmp(child->name, "onenand") == 0) {
+ /* DT incorrectly sets sync modes, onenand default is async */
+ gpmc_s.sync_read = false;
+ gpmc_s.sync_write = false;
+
} else {
if (of_property_read_u32(child, "bank-width",
&gpmc_s.device_width)) {
@@ -1363,12 +1331,11 @@ static int gpmc_probe_dt(struct platform_device *pdev)
if (!child->name)
continue;
- if (of_node_cmp(child->name, "onenand") == 0)
- ret = gpmc_probe_onenand_child(pdev, child);
- else if (of_node_cmp(child->name, "ethernet") == 0 ||
- of_node_cmp(child->name, "nor") == 0 ||
- of_node_cmp(child->name, "uart") == 0 ||
- of_node_cmp(child->name, "nand") == 0)
+ if (of_node_cmp(child->name, "ethernet") == 0 ||
+ of_node_cmp(child->name, "nor") == 0 ||
+ of_node_cmp(child->name, "uart") == 0 ||
+ of_node_cmp(child->name, "nand") == 0 ||
+ of_node_cmp(child->name, "onenand") == 0)
ret = gpmc_probe_generic_child(pdev, child);
if (WARN(ret < 0, "%s: probing gpmc child %s failed\n",
diff --git a/drivers/mtd/onenand/omap2.c b/drivers/mtd/onenand/omap2.c
index b6a9ec0..35d2d39 100644
--- a/drivers/mtd/onenand/omap2.c
+++ b/drivers/mtd/onenand/omap2.c
@@ -40,6 +40,10 @@
#include <linux/platform_data/gpmc-omap.h>
#include <linux/gpio.h>
#include <linux/omap-dma.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_mtd.h>
+#include <linux/of_gpio.h>
#define DRIVER_NAME "omap2-onenand"
@@ -826,9 +830,33 @@ static void omap2_onenand_shutdown(struct platform_device *pdev)
memset((__force void *)c->onenand.base, 0, ONENAND_BUFRAM_SIZE);
}
+static int omap2_onenand_get_dt_info(struct device *dev,
+ struct omap2_onenand *c)
+{
+ struct device_node *node = dev->of_node;
+
+ /* Chip Select number */
+ if (of_property_read_u32(node, "reg", &c->gpmc_cs) < 0) {
+ dev_err(dev, "No 'reg' property\n");
+ return -EINVAL;
+ }
+
+ /* Enable synchronous read by default */
+ c->flags = ONENAND_SYNC_READ;
+ /* Enable synchronous write only if indicated by DT */
+ if (of_property_read_bool(node, "ti,onenand-sync-rw"))
+ c->flags = ONENAND_SYNC_READWRITE;
+
+ /* TODO: DMA channel, GPIO IRQ for wait */
+ c->dma_channel = -1;
+ c->gpio_irq = -EINVAL;
+
+ return 0;
+}
+
static int omap2_onenand_probe(struct platform_device *pdev)
{
- struct omap_onenand_platform_data *pdata;
+ struct omap_onenand_platform_data *pdata = NULL;
struct omap2_onenand *c;
struct onenand_chip *this;
int r;
@@ -836,28 +864,40 @@ static int omap2_onenand_probe(struct platform_device *pdev)
struct mtd_part_parser_data ppdata = {};
struct device *dev = &pdev->dev;
- pdata = dev_get_platdata(&pdev->dev);
- if (pdata == NULL) {
- dev_err(&pdev->dev, "platform data missing\n");
- return -ENODEV;
- }
-
c = devm_kzalloc(dev, sizeof(struct omap2_onenand), GFP_KERNEL);
if (!c)
return -ENOMEM;
- init_completion(&c->irq_done);
- init_completion(&c->dma_done);
- c->pdev = pdev;
- c->flags = pdata->flags;
- c->gpmc_cs = pdata->cs;
- c->gpio_irq = pdata->gpio_irq;
- c->dma_channel = pdata->dma_channel;
+ this = &c->onenand;
+
+ if (dev->of_node) {
+ if (omap2_onenand_get_dt_info(dev, c))
+ return -EINVAL;
+
+ } else {
+ pdata = dev_get_platdata(dev);
+ if (pdata == NULL) {
+ dev_err(dev, "platform data missing\n");
+ return -ENODEV;
+ }
+
+ c->flags = pdata->flags;
+ c->gpio_irq = pdata->gpio_irq;
+ c->dma_channel = pdata->dma_channel;
+
+ if (pdata->skip_initial_unlocking)
+ this->options |= ONENAND_SKIP_INITIAL_UNLOCKING;
+ }
+
if (c->dma_channel < 0) {
/* if -1, don't use DMA */
c->gpio_irq = -EINVAL;
}
+ init_completion(&c->irq_done);
+ init_completion(&c->dma_done);
+ c->pdev = pdev;
+
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
c->onenand.base = devm_ioremap_resource(dev, res);
if (IS_ERR(c->onenand.base))
@@ -921,7 +961,6 @@ static int omap2_onenand_probe(struct platform_device *pdev)
c->mtd.dev.parent = &pdev->dev;
- this = &c->onenand;
if (c->dma_channel >= 0) {
this->wait = omap2_onenand_wait;
if (c->flags & ONENAND_IN_OMAP34XX) {
@@ -933,19 +972,20 @@ static int omap2_onenand_probe(struct platform_device *pdev)
}
}
- if (pdata->skip_initial_unlocking)
- this->options |= ONENAND_SKIP_INITIAL_UNLOCKING;
-
r = onenand_scan(&c->mtd, 1);
if (r) {
dev_err(dev, "OneNAND scan failed :%d\n", r);
goto err_release_dma;
}
- ppdata.of_node = pdata->of_node;
- r = mtd_device_parse_register(&c->mtd, NULL, &ppdata,
- pdata ? pdata->parts : NULL,
- pdata ? pdata->nr_parts : 0);
+ if (dev->of_node) {
+ ppdata.of_node = dev->of_node;
+ r = mtd_device_parse_register(&c->mtd, NULL, &ppdata, NULL, 0);
+
+ } else {
+ r = mtd_device_register(&c->mtd, pdata->parts, pdata->nr_parts);
+ }
+
if (r)
goto err_release_onenand;
@@ -974,6 +1014,11 @@ static int omap2_onenand_remove(struct platform_device *pdev)
return 0;
}
+static const struct of_device_id omap2_onenand_ids[] = {
+ { .compatible = "ti,omap2-onenand", },
+ {},
+};
+
static struct platform_driver omap2_onenand_driver = {
.probe = omap2_onenand_probe,
.remove = omap2_onenand_remove,
@@ -981,6 +1026,7 @@ static struct platform_driver omap2_onenand_driver = {
.driver = {
.name = DRIVER_NAME,
.owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(omap2_onenand_ids),
},
};
diff --git a/include/linux/platform_data/mtd-onenand-omap2.h b/include/linux/platform_data/mtd-onenand-omap2.h
index ac1e6f3..99d8716 100644
--- a/include/linux/platform_data/mtd-onenand-omap2.h
+++ b/include/linux/platform_data/mtd-onenand-omap2.h
@@ -26,10 +26,8 @@ struct omap_onenand_platform_data {
u8 flags;
u8 skip_initial_unlocking;
- /* for passing the partitions */
- struct device_node *of_node;
-
u8 regulator_can_sleep; /* deprecated */
int (*onenand_setup)(void __iomem *, int *freq_ptr); /* deprecated */
+ struct device_node *of_node; /* deprecated */
};
#endif
--
1.8.3.2
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