On Thu, Dec 10, 2015 at 06:11:37PM +0530, Archit Taneja wrote:
Add a device name field in mipi_dsi_device. This name is different from
the actual dev name (which is of the format "hostname.reg"). When the
device is created via DT, this name is set to the modalias string.
Why? What's the use of setting this to the modalias string?
In the non-DT case, the driver creating the DSI device provides the
name by populating a filed in mipi_dsi_device_info.
Matching for DT case would be as it was before. For the non-DT case,
we compare the device and driver names. Other buses (like i2c/spi)
"I2C" and "SPI", please.
perform a non-DT match by comparing the device name and entries in the
driver's id_table. Such a mechanism isn't used for the dsi bus.
"DSI", please.
Reviewed-by: Andrzej Hajda <a.hajda@xxxxxxxxxxx>
Signed-off-by: Archit Taneja <architt@xxxxxxxxxxxxxx>
---
drivers/gpu/drm/drm_mipi_dsi.c | 25 ++++++++++++++++++++++++-
include/drm/drm_mipi_dsi.h | 6 ++++++
2 files changed, 30 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/drm_mipi_dsi.c b/drivers/gpu/drm/drm_mipi_dsi.c
index 9434585..5a46802 100644
--- a/drivers/gpu/drm/drm_mipi_dsi.c
+++ b/drivers/gpu/drm/drm_mipi_dsi.c
@@ -45,9 +45,26 @@
* subset of the MIPI DCS command set.
*/
+static const struct device_type mipi_dsi_device_type;
+
static int mipi_dsi_device_match(struct device *dev, struct device_driver *drv)
{
- return of_driver_match_device(dev, drv);
+ struct mipi_dsi_device *dsi;
+
+ if (dev->type == &mipi_dsi_device_type)
+ dsi = to_mipi_dsi_device(dev);
+ else
+ return 0;
I think this check is redundant. I'm not aware of any case where the bus
->match() callback is called on a device that isn't on said bus.
+ /* attempt OF style match */
+ if (of_driver_match_device(dev, drv))
+ return 1;
+
+ /* compare dsi device and driver names */
"DSI", please.
+ if (!strcmp(dsi->name, drv->name))
+ return 1;
+
+ return 0;
}
static const struct dev_pm_ops mipi_dsi_device_pm_ops = {
@@ -125,6 +142,7 @@ struct mipi_dsi_device *mipi_dsi_device_new(struct mipi_dsi_host *host,
dsi->dev.type = &mipi_dsi_device_type;
dsi->dev.of_node = info->node;
dsi->channel = info->reg;
+ strlcpy(dsi->name, info->type, sizeof(dsi->name));
Don't you need to check info->type != NULL before doing this?
dev_set_name(&dsi->dev, "%s.%d", dev_name(host->dev), info->reg);
@@ -148,6 +166,11 @@ of_mipi_dsi_device_add(struct mipi_dsi_host *host, struct device_node *node)
int ret;
u32 reg;
+ if (of_modalias_node(node, info.type, sizeof(info.type)) < 0) {
+ dev_err(dev, "modalias failure on %s\n", node->full_name);
+ return ERR_PTR(-EINVAL);
+ }
+
ret = of_property_read_u32(node, "reg", ®);
if (ret) {
dev_err(dev, "device node %s has no valid reg property: %d\n",
diff --git a/include/drm/drm_mipi_dsi.h b/include/drm/drm_mipi_dsi.h
index 90f4f3c..cb084af 100644
--- a/include/drm/drm_mipi_dsi.h
+++ b/include/drm/drm_mipi_dsi.h
@@ -139,8 +139,11 @@ enum mipi_dsi_pixel_format {
MIPI_DSI_FMT_RGB565,
};
+#define DSI_DEV_NAME_SIZE 20
+
/**
* struct mipi_dsi_device_info - template for creating a mipi_dsi_device
+ * @type: dsi peripheral chip type
* @reg: DSI virtual channel assigned to peripheral
* @node: pointer to OF device node
*
@@ -148,6 +151,7 @@ enum mipi_dsi_pixel_format {
* DSI device
*/
struct mipi_dsi_device_info {
+ char type[DSI_DEV_NAME_SIZE];
Why limit ourselves to 20 characters? And why even so complicated? Isn't
the type always static when someone specifies this? Couldn't we simply
use a const char *name here instead?
Thierry