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SSBI: Convert SSBI to device tree

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The SSBI bus is exclusive to the Qualcomm MSM targets, and all SoCs
using it will be using device tree.  Convert this driver to indentify
with device tree.

This makes the bus probing a good bit simpler, since the attaching of
child nodes can be represented directly in the devicetree, rather than
having to be inferred by name.

Signed-off-by: David Brown <davidb@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
David Brown 2013-03-12 11:41:50 -07:00 committed by Greg Kroah-Hartman
parent 4a6692e2ac
commit 97f00f7120
4 changed files with 62 additions and 49 deletions
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18
Documentation/devicetree/bindings/arm/msm/ssbi.txt Normal file
View File

@ -0,0 +1,18 @@
* Qualcomm SSBI
Some Qualcomm MSM devices contain a point-to-point serial bus used to
communicate with a limited range of devices (mostly power management
chips).
These require the following properties:
- compatible: "qcom,ssbi"
- qcom,controller-type
indicates the SSBI bus variant the controller should use to talk
with the slave device. This should be one of "ssbi", "ssbi2", or
"pmic-arbiter". The type chosen is determined by the attached
slave.
The slave device should be the single child node of the ssbi device
with a compatible field.

6
arch/arm/boot/dts/msm8660-surf.dts
View File

@ -38,4 +38,10 @@
<0x19c00000 0x1000>;
interrupts = <0 195 0x0>;
};
qcom,ssbi@500000 {
compatible = "qcom,ssbi";
reg = <0x500000 0x1000>;
qcom,controller-type = "pmic-arbiter";
};
};

6
arch/arm/boot/dts/msm8960-cdp.dts
View File

@ -38,4 +38,10 @@
<0x16400000 0x1000>;
interrupts = <0 154 0x0>;
};
qcom,ssbi@500000 {
compatible = "qcom,ssbi";
reg = <0x500000 0x1000>;
qcom,controller-type = "pmic-arbiter";
};
};

81
drivers/ssbi/ssbi.c
View File

@ -26,6 +26,8 @@
#include <linux/slab.h>
#include <linux/msm_ssbi.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
/* SSBI 2.0 controller registers */
#define SSBI2_CMD 0x0008
@ -261,56 +263,13 @@ int msm_ssbi_write(struct device *dev, u16 addr, u8 *buf, int len)
}
EXPORT_SYMBOL_GPL(msm_ssbi_write);
static int msm_ssbi_add_slave(struct msm_ssbi *ssbi,
const struct msm_ssbi_slave_info *slave)
{
struct platform_device *slave_pdev;
int ret;
if (ssbi->slave) {
pr_err("slave already attached??\n");
return -EBUSY;
}
slave_pdev = platform_device_alloc(slave->name, -1);
if (!slave_pdev) {
pr_err("cannot allocate pdev for slave '%s'", slave->name);
ret = -ENOMEM;
goto err;
}
slave_pdev->dev.parent = ssbi->dev;
slave_pdev->dev.platform_data = slave->platform_data;
ret = platform_device_add(slave_pdev);
if (ret) {
pr_err("cannot add slave platform device for '%s'\n",
slave->name);
goto err;
}
ssbi->slave = &slave_pdev->dev;
return 0;
err:
if (slave_pdev)
platform_device_put(slave_pdev);
return ret;
}
static int msm_ssbi_probe(struct platform_device *pdev)
{
const struct msm_ssbi_platform_data *pdata = pdev->dev.platform_data;
struct device_node *np = pdev->dev.of_node;
struct resource *mem_res;
struct msm_ssbi *ssbi;
int ret = 0;
if (!pdata) {
pr_err("missing platform data\n");
return -EINVAL;
}
pr_debug("%s\n", pdata->slave.name);
const char *type;
ssbi = kzalloc(sizeof(struct msm_ssbi), GFP_KERNEL);
if (!ssbi) {
@ -334,7 +293,25 @@ static int msm_ssbi_probe(struct platform_device *pdev)
ssbi->dev = &pdev->dev;
platform_set_drvdata(pdev, ssbi);
ssbi->controller_type = pdata->controller_type;
type = of_get_property(np, "qcom,controller-type", NULL);
if (type == NULL) {
pr_err("Missing qcom,controller-type property\n");
ret = -EINVAL;
goto err_ssbi_controller;
}
dev_info(&pdev->dev, "SSBI controller type: '%s'\n", type);
if (strcmp(type, "ssbi") == 0)
ssbi->controller_type = MSM_SBI_CTRL_SSBI;
else if (strcmp(type, "ssbi2") == 0)
ssbi->controller_type = MSM_SBI_CTRL_SSBI2;
else if (strcmp(type, "pmic-arbiter") == 0)
ssbi->controller_type = MSM_SBI_CTRL_PMIC_ARBITER;
else {
pr_err("Unknown qcom,controller-type\n");
ret = -EINVAL;
goto err_ssbi_controller;
}
if (ssbi->controller_type == MSM_SBI_CTRL_PMIC_ARBITER) {
ssbi->read = msm_ssbi_pa_read_bytes;
ssbi->write = msm_ssbi_pa_write_bytes;
@ -345,13 +322,13 @@ static int msm_ssbi_probe(struct platform_device *pdev)
spin_lock_init(&ssbi->lock);
ret = msm_ssbi_add_slave(ssbi, &pdata->slave);
ret = of_platform_populate(np, NULL, NULL, &pdev->dev);
if (ret)
goto err_ssbi_add_slave;
goto err_ssbi_controller;
return 0;
err_ssbi_add_slave:
err_ssbi_controller:
platform_set_drvdata(pdev, NULL);
iounmap(ssbi->base);
err_ioremap:
@ -370,12 +347,18 @@ static int msm_ssbi_remove(struct platform_device *pdev)
return 0;
}
static struct of_device_id ssbi_match_table[] = {
{ .compatible = "qcom,ssbi" },
{}
};
static struct platform_driver msm_ssbi_driver = {
.probe = msm_ssbi_probe,
.remove = msm_ssbi_remove,
.driver = {
.name = "msm_ssbi",
.owner = THIS_MODULE,
.of_match_table = ssbi_match_table,
},
};