From 7abea617a4bae178da0f42983998c779ec2f732d Mon Sep 17 00:00:00 2001 From: Nishanth Menon Date: Wed, 24 Jun 2015 11:26:54 -0500 Subject: [PATCH] rtc: ds1307: Support optional wakeup interrupt source With the recent pinctrl-single changes, SoCs such as Texas Instrument's OMAP processors can treat wake-up events from deeper idle states as interrupts. Let's add support for the optional second interrupt for wake-up using the generic wakeirq support added in commit 4990d4fe327b ("PM / Wakeirq: Add automated device wake IRQ handling") Finally, to pass the wake-up interrupt in the dts file, interrupts-extended property needs to be passed. This is similar in approach to commit 2a0b965cfb6e ("serial: omap: Add support for optional wake-up") + ee83bd3b6483 ("serial: omap: Switch wake-up interrupt to generic wakeirq") Signed-off-by: Nishanth Menon Reviewed-by: Grygorii Strashko Acked-by: Tony Lindgren Acked-by: Felipe Balbi Signed-off-by: Alexandre Belloni --- drivers/rtc/rtc-ds1307.c | 36 +++++++++++++++++++++++++++++++++--- 1 file changed, 33 insertions(+), 3 deletions(-) diff --git a/drivers/rtc/rtc-ds1307.c b/drivers/rtc/rtc-ds1307.c index b03880fc32b5..e16989c48a90 100644 --- a/drivers/rtc/rtc-ds1307.c +++ b/drivers/rtc/rtc-ds1307.c @@ -15,6 +15,9 @@ #include #include #include +#include +#include +#include #include #include #include @@ -114,6 +117,7 @@ struct ds1307 { #define HAS_ALARM 1 /* bit 1 == irq claimed */ struct i2c_client *client; struct rtc_device *rtc; + int wakeirq; s32 (*read_block_data)(const struct i2c_client *client, u8 command, u8 length, u8 *values); s32 (*write_block_data)(const struct i2c_client *client, u8 command, @@ -1156,6 +1160,8 @@ read_rtc: } if (want_irq) { + struct device_node *node = client->dev.of_node; + err = devm_request_threaded_irq(&client->dev, client->irq, NULL, irq_handler, IRQF_SHARED | IRQF_ONESHOT, @@ -1163,13 +1169,34 @@ read_rtc: if (err) { client->irq = 0; dev_err(&client->dev, "unable to request IRQ!\n"); - } else { + goto no_irq; + } - set_bit(HAS_ALARM, &ds1307->flags); - dev_dbg(&client->dev, "got IRQ %d\n", client->irq); + set_bit(HAS_ALARM, &ds1307->flags); + dev_dbg(&client->dev, "got IRQ %d\n", client->irq); + + /* Currently supported by OF code only! */ + if (!node) + goto no_irq; + + err = of_irq_get(node, 1); + if (err <= 0) { + if (err == -EPROBE_DEFER) + goto exit; + goto no_irq; + } + ds1307->wakeirq = err; + + err = dev_pm_set_dedicated_wake_irq(&client->dev, + ds1307->wakeirq); + if (err) { + dev_err(&client->dev, "unable to setup wakeIRQ %d!\n", + err); + goto exit; } } +no_irq: if (chip->nvram_size) { ds1307->nvram = devm_kzalloc(&client->dev, @@ -1213,6 +1240,9 @@ static int ds1307_remove(struct i2c_client *client) { struct ds1307 *ds1307 = i2c_get_clientdata(client); + if (ds1307->wakeirq) + dev_pm_clear_wake_irq(&client->dev); + if (test_and_clear_bit(HAS_NVRAM, &ds1307->flags)) sysfs_remove_bin_file(&client->dev.kobj, ds1307->nvram); -- 2.20.1