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Commit b49e1f11 authored by Hamad Kadmany's avatar Hamad Kadmany
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ci-bridge-spi: Add support for device-tree 



Add device tree support for external CAM bridge
over SPI interface

Change-Id: I8a65668de8a053d13f2bb3e3be06fc6b8dd85258
Signed-off-by: default avatarHamad Kadmany <hkadmany@codeaurora.org>
parent 462fa4ef

Documentation/devicetree/bindings/misc/ci_bridge_spi.txt

0 → 100644
+21 −0
Original line number Diff line number Diff line 
CI (CAM) Bridge Over SPI



Required properties:



- compatible: "smartv,cimax"

- reg: SPI chip-select

- spi-max-frequency: Max allowed frequency of SPI interface

- smartv,cimax-int-gpio: CIMax interrupt gpio pin

- smartv,cimax-rst-gpio: CIMax reset gpio pin



Example:



	spi@f9923000 {

	   ci-bridge-spi@0 {

			compatible = "smartv,cimax";

			reg = <0>;

			spi-max-frequency = <15000000>;

			smartv,cimax-int-gpio = <&msmgpio 133 0>;

			smartv,cimax-rst-gpio = <&ioexp_gpios 5 0>;

	   };

	};

Documentation/devicetree/bindings/vendor-prefixes.txt

+1 −0
Original line number Diff line number Diff line
@@ -55,6 +55,7 @@ renesas Renesas Electronics Corporation 
samsung	Samsung Semiconductor

sbs	Smart Battery System

schindler	Schindler

smartv SmartV Ltd

stk	Sensortek Technology Corporation.(formerly Sitronix Technology Co., Ltd.)

shinetech	Shine Tech Corporation, Ltd.

sil	Silicon Image

drivers/media/platform/msm/broadcast/ci-bridge-spi.c

+52 −9
Original line number Diff line number Diff line
@@ -27,7 +27,8 @@ 
#include <linux/uaccess.h>

#include <linux/gpio.h>

#include <linux/delay.h>



#include <linux/of.h>

#include <linux/of_gpio.h>

#include <linux/ci-bridge-spi.h>



#define CI_MAX_BUFFER_SIZE	(64 * 1024)
@@ -47,25 +48,67 @@ struct ci_bridge { 


};



static struct of_device_id cibridge_match_table[] = {

	{.compatible = "smartv,cimax"},

	{}

};



static struct ci_bridge ci;



static int ci_bridge_spi_dt_to_pdata(struct spi_device *spi,

			struct ci_bridge_platform_data *pdata)

{

	struct device_node *node = spi->dev.of_node;



	pdata->reset_pin = of_get_named_gpio(node, "smartv,cimax-rst-gpio", 0);

	if (pdata->reset_pin < 0) {

		pr_err("%s: Could not find reset gpio, err %d\n",

			__func__, pdata->reset_pin);

		return -EINVAL;

	}



	pdata->interrupt_pin = of_get_named_gpio(node,

		"smartv,cimax-int-gpio", 0);

	if (pdata->interrupt_pin < 0) {

		pr_err("%s: Could not find interrupt gpio, err %d\n",

			__func__, pdata->reset_pin);

		return -EINVAL;

	}



	return 0;

}



static int ci_bridge_spi_probe(struct spi_device *spi)

{

	int ret;

	struct ci_bridge_platform_data *pdata;



	if (spi->dev.platform_data == NULL) {

	if (spi->dev.of_node) {

		struct ci_bridge_platform_data pdata;



		/* get information from device tree */

		ret = ci_bridge_spi_dt_to_pdata(spi, &pdata);

		if (ret < 0) {

			pr_err("%s: parsing DT failed %d\n", __func__, ret);

			return ret;

		}



		ci.gpio_reset_pin = pdata.reset_pin;

		ci.gpio_interrupt_pin = pdata.interrupt_pin;

	} else {

		struct ci_bridge_platform_data *pdata = spi->dev.platform_data;

		if (!pdata) {

			pr_err("%s: platform data is missing\n", __func__);

			return -EINVAL;

		}



		ci.gpio_reset_pin = pdata->reset_pin;

		ci.gpio_interrupt_pin = pdata->interrupt_pin;

	}



	ci.spi = spi;

	ci.num_opened = 0;

	mutex_init(&ci.lock);

	spi_set_drvdata(spi, &ci);

	pdata = spi->dev.platform_data;

	ci.gpio_reset_pin = pdata->reset_pin;

	ci.gpio_interrupt_pin = pdata->interrupt_pin;



	ret = gpio_request(ci.gpio_reset_pin, "ci_bridge_spi");

	if (ret) {
@@ -120,6 +163,7 @@ static int ci_bridge_spi_remove(struct spi_device *spi) 
static struct spi_driver ci_bridge_driver = {

	.driver = {

		.name = "ci_bridge_spi",

		.of_match_table = cibridge_match_table,

		.owner = THIS_MODULE,

	},

	.probe = ci_bridge_spi_probe,
@@ -378,7 +422,6 @@ static int __init ci_bridge_init(void) 
		goto class_destroy;

	}





	ci.bridge_dev = device_create(ci.bridge_class, NULL, ci.cdev.dev,

				     &ci, "ci_bridge_spi0");

	if (IS_ERR(ci.bridge_dev)) {

include/linux/ci-bridge-spi.h

+2 −2
Original line number Diff line number Diff line
@@ -4,8 +4,8 @@ 
#include <uapi/linux/ci-bridge-spi.h>



struct ci_bridge_platform_data {

	unsigned int reset_pin;

	unsigned int interrupt_pin;

	int reset_pin;

	int interrupt_pin;

};



#endif