Re: [PATCH] input: touchscreen: add OF match table for ads7846

Hi Grant,
Thanks.

2011/6/13 Grant Likely [off-list ref]:

On Thu, Jun 9, 2011 at 8:28 PM, Barry Song [off-list ref] wrote:

quoted

The current ads7846 has no OF match table. The method used is by applying a heuristic (of_modalias_node) which tries to name the device in a way that will match an existing device driver.
This patch adds explicit OF match table for ads7846, then the normal device tree match behaviour will always work.
It has been tested on PRIMA2 EVB board of CSR with a SPI's child node like the below:
ts@0 {
       compatible = "ti,ads7845";
       reg = <0x0>;
       spi-max-frequency = <31250>;
       interrupts = <90>;
};

Signed-off-by: Barry Song <redacted>
Cc: Grant Likely <redacted>
cc: Thomas Chou <redacted>
---
 drivers/input/touchscreen/ads7846.c |   14 ++++++++++++++

There should also be documentation for the new binding added to
Documentation/devicetree/bindings for the new compatible strings.

Which directory do you think is the best to place this document? or do
we build a new diretory named
Documentation/devicetree/bindings/input/touchscreen/ ?
The dir Documentation/devicetree/bindings seems to be for spi host,
not for spi clients.

quoted

 1 files changed, 14 insertions(+), 0 deletions(-)

diff --git a/drivers/input/touchscreen/ads7846.c b/drivers/input/touchscreen/ads7846.c
index 5196861..643138b 100644
--- a/drivers/input/touchscreen/ads7846.c
+++ b/drivers/input/touchscreen/ads7846.c

@@ -28,6 +28,7 @@

 #include <linux/slab.h>
 #include <linux/pm.h>
 #include <linux/gpio.h>
+#include <linux/of.h>
 #include <linux/spi/spi.h>
 #include <linux/spi/ads7846.h>
 #include <linux/regulator/consumer.h>

@@ -1425,12 +1426,25 @@ static int __devexit ads7846_remove(struct spi_device *spi)

       return 0;
 }

+#if defined(CONFIG_OF)
+static struct of_device_id ads7846_spi_of_match_table[] __devinitdata = {
+       { .compatible = "ti,ads7846", },
+       { .compatible = "ti,ads7845", },
+       { .compatible = "ti,ads7843", },
+       {},
+};
+MODULE_DEVICE_TABLE(of, ads7846_spi_of_match_table);

#else
#define ads7846_spi_of_match_table NULL

quoted

+#endif
+
 static struct spi_driver ads7846_driver = {
       .driver = {
               .name   = "ads7846",
               .bus    = &spi_bus_type,
               .owner  = THIS_MODULE,
               .pm     = &ads7846_pm,
+#if defined(CONFIG_OF)
+               .of_match_table = ads7846_spi_of_match_table,
+#endif

With the #else  block added above, you can drop the #if/#endif
protection around of_match_table.

ok. thanks

Otherwise:

Acked-by: Grant Likely <redacted>

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