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platform/chrome: wilco_ec: Add RTC driver

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This Embedded Controller has an internal RTC that is exposed
as a standard RTC class driver with read/write functionality.

The driver is added to the drivers/rtc/ so that the maintainer of that
directory will be able to comment on this change, as that maintainer is
the expert on this system. In addition, the driver code is called
indirectly after a corresponding device is registered from core.c,
as opposed to core.c registering the driver callbacks directly.

To test:
> hwclock --show --rtc /dev/rtc1
2007-12-31 16:01:20.460959-08:00
> hwclock --systohc --rtc /dev/rtc1
> hwclock --show --rtc /dev/rtc1
2018-11-29 17:08:00.780793-08:00

> hwclock --show --rtc /dev/rtc1
2007-12-31 16:01:20.460959-08:00
> hwclock --systohc --rtc /dev/rtc1
> hwclock --show --rtc /dev/rtc1
2018-11-29 17:08:00.780793-08:00

Signed-off-by: Duncan Laurie <dlaurie@google.com>
Signed-off-by: Nick Crews <ncrews@chromium.org>
Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
[Fix the sparse warning: symbol 'wilco_ec_rtc_read/write' was not declared]
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
This commit is contained in:
Nick Crews
2019-02-08 17:37:19 -07:00
committed by Enric Balletbo i Serra
父節點 b787bb126c
當前提交 0d2f2a3da1
共有 5 個文件被更改，包括 209 次插入 和 0 次删除
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18
drivers/platform/chrome/wilco_ec/core.c
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@@ -42,6 +42,7 @@ static int wilco_ec_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct wilco_ec_device *ec;
int ret;
ec = devm_kzalloc(dev, sizeof(*ec), GFP_KERNEL);
if (!ec)
@@ -78,13 +79,30 @@ static int wilco_ec_probe(struct platform_device *pdev)
PLATFORM_DEVID_AUTO,
NULL, 0);
/* Register a child device that will be found by the RTC driver. */
ec->rtc_pdev = platform_device_register_data(dev, "rtc-wilco-ec",
PLATFORM_DEVID_AUTO,
NULL, 0);
if (IS_ERR(ec->rtc_pdev)) {
dev_err(dev, "Failed to create RTC platform device\n");
ret = PTR_ERR(ec->rtc_pdev);
goto unregister_debugfs;
}
return 0;
unregister_debugfs:
if (ec->debugfs_pdev)
platform_device_unregister(ec->debugfs_pdev);
cros_ec_lpc_mec_destroy();
return ret;
}
static int wilco_ec_remove(struct platform_device *pdev)
{
struct wilco_ec_device *ec = platform_get_drvdata(pdev);
platform_device_unregister(ec->rtc_pdev);
if (ec->debugfs_pdev)
platform_device_unregister(ec->debugfs_pdev);