[PATCH 6/7] ath9k: Allow using the reset API for the external reset

Alban
2017-03-13T21:05:14Z

From: Alban Bedel <albeu@free.fr>

Allow using the reset API instead of a platform specific callback to
reset the device.

Signed-off-by: Alban Bedel <albeu@free.fr>
---
drivers/net/wireless/ath/ath9k/hw.c | 26 +++++++++++++++++++++-----
drivers/net/wireless/ath/ath9k/hw.h | 1 +
drivers/net/wireless/ath/ath9k/init.c | 10 ++++++++++
3 files changed, 32 insertions(+), 5 deletions(-)

diff --git a/drivers/net/wireless/ath/ath9k/hw.c b/drivers/net/wireless/ath/ath9k/hw.c
index 8c5c2dd..efc0435 100644
--- a/drivers/net/wireless/ath/ath9k/hw.c
+++ b/drivers/net/wireless/ath/ath9k/hw.c
@@ -21,6 +21,7 @@
#include <linux/bitops.h>
#include <linux/etherdevice.h>
#include <linux/gpio.h>
+#include <linux/reset.h>
#include <asm/unaligned.h>

#include "hw.h"
@@ -551,6 +552,24 @@ static int ath9k_hw_attach_ops(struct ath_hw *ah)
return 0;
}

+static int ath9k_hw_external_reset(struct ath_hw *ah)
+{
+ int ret = 0;
+
+ ath_dbg(ath9k_hw_common(ah), RESET,
+ "reset MAC via external reset\n");
+
+ if (ah->external_reset) {
+ ret = ah->external_reset();
+ } else if (ah->reset) {
+ ret = reset_control_assert(ah->reset);
+ if (!ret)
+ ret = reset_control_deassert(ah->reset);
+ }
+
+ return ret;
+}
+
/* Called for all hardware families */
static int __ath9k_hw_init(struct ath_hw *ah)
{
@@ -1286,14 +1305,11 @@ static bool ath9k_hw_ar9330_reset_war(struct ath_hw *ah, int type)
break;
}

- if (ah->external_reset &&
+ if ((ah->reset || ah->external_reset) &&
(npend || type == ATH9K_RESET_COLD)) {
int reset_err = 0;

- ath_dbg(ath9k_hw_common(ah), RESET,
- "reset MAC via external reset\n");
-
- reset_err = ah->external_reset();
+ reset_err = ath9k_hw_external_reset(ah);
if (reset_err) {
ath_err(ath9k_hw_common(ah),
"External reset failed, err=%d\n",
diff --git a/drivers/net/wireless/ath/ath9k/hw.h b/drivers/net/wireless/ath/ath9k/hw.h
index 7f17c2a..53b67e3 100644
--- a/drivers/net/wireless/ath/ath9k/hw.h
+++ b/drivers/net/wireless/ath/ath9k/hw.h
@@ -966,6 +966,7 @@ struct ath_hw {
bool is_clk_25mhz;
int (*get_mac_revision)(void);
int (*external_reset)(void);
+ struct reset_control *reset;
bool disable_2ghz;
bool disable_5ghz;

diff --git a/drivers/net/wireless/ath/ath9k/init.c b/drivers/net/wireless/ath/ath9k/init.c
index 5cb9c61..f1cb806 100644
--- a/drivers/net/wireless/ath/ath9k/init.c
+++ b/drivers/net/wireless/ath/ath9k/init.c
@@ -25,6 +25,7 @@
#include <linux/nvmem-consumer.h>
#include <linux/relay.h>
#include <linux/clk.h>
+#include <linux/reset.h>
#include <net/ieee80211_radiotap.h>

#include "ath9k.h"
@@ -697,6 +698,15 @@ static int ath9k_init_softc(u16 devid, struct ath_softc *sc,
if (!is_valid_ether_addr(common->macaddr))
ath9k_get_nvmem_address(sc);

+ /* Try to get a reset controller */
+ ah->reset = devm_reset_control_get_optional(sc->dev, NULL);
+ if (IS_ERR(ah->reset)) {
+ if (PTR_ERR(ah->reset) != -ENOENT &&
+ PTR_ERR(ah->reset) != -ENOTSUPP)
+ return PTR_ERR(ah->reset);
+ ah->reset = NULL;
+ }
+
/* If the EEPROM hasn't been retrieved via firmware request
* use the nvmem API insted.
*/
--
2.7.4