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staging: board: Add support for devices with complex dependencies

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Add support for easy registering of one ore more platform devices that
may:
  - need clocks that are described in DT,
  - be part of a PM Domain.

All these dependencies are optional.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Geert Uytterhoeven 2015-06-17 10:38:54 +02:00 committed by Greg Kroah-Hartman
parent a85890883e
commit 225d68d852
2 changed files with 76 additions and 0 deletions
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56
drivers/staging/board/board.c
View File

@ -9,6 +9,7 @@
#define pr_fmt(fmt) "board_staging: " fmt
#include <linux/clkdev.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/device.h>
@ -16,6 +17,8 @@
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/platform_device.h>
#include <linux/pm_domain.h>
#include "board.h"
@ -118,3 +121,56 @@ void __init board_staging_gic_fixup_resources(struct resource *res,
for (i = 0; i < nres; i++)
gic_fixup_resource(&res[i]);
}
int __init board_staging_register_clock(const struct board_staging_clk *bsc)
{
int error;
pr_debug("Aliasing clock %s for con_id %s dev_id %s\n", bsc->clk,
bsc->con_id, bsc->dev_id);
error = clk_add_alias(bsc->con_id, bsc->dev_id, bsc->clk, NULL);
if (error)
pr_err("Failed to alias clock %s (%d)\n", bsc->clk, error);
return error;
}
int __init board_staging_register_device(const struct board_staging_dev *dev)
{
struct platform_device *pdev = dev->pdev;
unsigned int i;
int error;
pr_debug("Trying to register device %s\n", pdev->name);
if (board_staging_dt_node_available(pdev->resource,
pdev->num_resources)) {
pr_warn("Skipping %s, already in DT\n", pdev->name);
return -EEXIST;
}
board_staging_gic_fixup_resources(pdev->resource, pdev->num_resources);
for (i = 0; i < dev->nclocks; i++)
board_staging_register_clock(&dev->clocks[i]);
error = platform_device_register(pdev);
if (error) {
pr_err("Failed to register device %s (%d)\n", pdev->name,
error);
return error;
}
if (dev->domain)
__pm_genpd_name_add_device(dev->domain, &pdev->dev, NULL);
return error;
}
void __init board_staging_register_devices(const struct board_staging_dev *devs,
unsigned int ndevs)
{
unsigned int i;
for (i = 0; i < ndevs; i++)
board_staging_register_device(&devs[i]);
}

20
drivers/staging/board/board.h
View File

@ -4,12 +4,32 @@
#include <linux/init.h>
#include <linux/of.h>
struct board_staging_clk {
const char *clk;
const char *con_id;
const char *dev_id;
};
struct board_staging_dev {
/* Platform Device */
struct platform_device *pdev;
/* Clocks (optional) */
const struct board_staging_clk *clocks;
unsigned int nclocks;
/* Generic PM Domain (optional) */
const char *domain;
};
struct resource;
bool board_staging_dt_node_available(const struct resource *resource,
unsigned int num_resources);
int board_staging_gic_setup_xlate(const char *gic_match, unsigned int base);
void board_staging_gic_fixup_resources(struct resource *res, unsigned int nres);
int board_staging_register_clock(const struct board_staging_clk *bsc);
int board_staging_register_device(const struct board_staging_dev *dev);
void board_staging_register_devices(const struct board_staging_dev *devs,
unsigned int ndevs);
#define board_staging(str, fn) \
static int __init runtime_board_check(void) \