[PATCH] rtc: hym8563: fix swapped enable/disable of clockout control bit

[PATCH] rtc: hym8563: fix swapped enable/disable of clockout control bit

[Heiko Stübner]

The hym8563 datasheet describes the clock output control-bit as "when set
to logic 0, the square wave output is enable, when set to logic 1, the
CLKOUT output is inhibited". But in reality the setting is exactly
opposite.

Before now, the clock output was not really used, but on the rk3288 soc
this generated clock is used to supply the temperature sensor block and
the swapped bit value prevented it from working. With the corrected value,
the tsadc now reports correct values.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
---
 drivers/rtc/rtc-hym8563.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/rtc/rtc-hym8563.c b/drivers/rtc/rtc-hym8563.c
index d4a6561..0f710e9 100644
--- a/drivers/rtc/rtc-hym8563.c
+++ b/drivers/rtc/rtc-hym8563.c
@@ -66,7 +66,7 @@
 #define HYM8563_ALM_BIT_DISABLE	BIT(7)
 
 #define HYM8563_CLKOUT		0x0d
-#define HYM8563_CLKOUT_DISABLE	BIT(7)
+#define HYM8563_CLKOUT_ENABLE	BIT(7)
 #define HYM8563_CLKOUT_32768	0
 #define HYM8563_CLKOUT_1024	1
 #define HYM8563_CLKOUT_32	2
@@ -360,9 +360,9 @@ static int hym8563_clkout_control(struct clk_hw *hw, bool enable)
 		return ret;
 
 	if (enable)
-		ret &= ~HYM8563_CLKOUT_DISABLE;
+		ret |= HYM8563_CLKOUT_ENABLE;
 	else
-		ret |= HYM8563_CLKOUT_DISABLE;
+		ret &= ~HYM8563_CLKOUT_ENABLE;
 
 	return i2c_smbus_write_byte_data(client, HYM8563_CLKOUT, ret);
 }
@@ -386,7 +386,7 @@ static int hym8563_clkout_is_prepared(struct clk_hw *hw)
 	if (ret < 0)
 		return ret;
 
-	return !(ret & HYM8563_CLKOUT_DISABLE);
+	return !!(ret & HYM8563_CLKOUT_ENABLE);
 }
 
 static const struct clk_ops hym8563_clkout_ops = {
@@ -407,7 +407,7 @@ static struct clk *hym8563_clkout_register_clk(struct hym8563 *hym8563)
 	int ret;
 
 	ret = i2c_smbus_write_byte_data(client, HYM8563_CLKOUT,
-						HYM8563_CLKOUT_DISABLE);
+						0);
 	if (ret < 0)
 		return ERR_PTR(ret);
 
-- 
2.1.4

[rtc-linux] [PATCH] rtc: hym8563: fix swapped enable/disable of clockout control bit

[Heiko Stübner]

The hym8563 datasheet describes the clock output control-bit as "when set
to logic 0, the square wave output is enable, when set to logic 1, the
CLKOUT output is inhibited". But in reality the setting is exactly
opposite.

Before now, the clock output was not really used, but on the rk3288 soc
this generated clock is used to supply the temperature sensor block and
the swapped bit value prevented it from working. With the corrected value,
the tsadc now reports correct values.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
---
 drivers/rtc/rtc-hym8563.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/rtc/rtc-hym8563.c b/drivers/rtc/rtc-hym8563.c
index d4a6561..0f710e9 100644
--- a/drivers/rtc/rtc-hym8563.c
+++ b/drivers/rtc/rtc-hym8563.c
@@ -66,7 +66,7 @@
 #define HYM8563_ALM_BIT_DISABLE	BIT(7)
 
 #define HYM8563_CLKOUT		0x0d
-#define HYM8563_CLKOUT_DISABLE	BIT(7)
+#define HYM8563_CLKOUT_ENABLE	BIT(7)
 #define HYM8563_CLKOUT_32768	0
 #define HYM8563_CLKOUT_1024	1
 #define HYM8563_CLKOUT_32	2
@@ -360,9 +360,9 @@ static int hym8563_clkout_control(struct clk_hw *hw, bool enable)
 		return ret;
 
 	if (enable)
-		ret &= ~HYM8563_CLKOUT_DISABLE;
+		ret |= HYM8563_CLKOUT_ENABLE;
 	else
-		ret |= HYM8563_CLKOUT_DISABLE;
+		ret &= ~HYM8563_CLKOUT_ENABLE;
 
 	return i2c_smbus_write_byte_data(client, HYM8563_CLKOUT, ret);
 }
@@ -386,7 +386,7 @@ static int hym8563_clkout_is_prepared(struct clk_hw *hw)
 	if (ret < 0)
 		return ret;
 
-	return !(ret & HYM8563_CLKOUT_DISABLE);
+	return !!(ret & HYM8563_CLKOUT_ENABLE);
 }
 
 static const struct clk_ops hym8563_clkout_ops = {
@@ -407,7 +407,7 @@ static struct clk *hym8563_clkout_register_clk(struct hym8563 *hym8563)
 	int ret;
 
 	ret = i2c_smbus_write_byte_data(client, HYM8563_CLKOUT,
-						HYM8563_CLKOUT_DISABLE);
+						0);
 	if (ret < 0)
 		return ERR_PTR(ret);
 
-- 
2.1.4


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Re: [rtc-linux] [PATCH] rtc: hym8563: fix swapped enable/disable of clockout control bit

[Alexandre Belloni]

On 05/04/2015 at 02:20:24 +0200, Heiko Stübner wrote :
> The hym8563 datasheet describes the clock output control-bit as "when set
> to logic 0, the square wave output is enable, when set to logic 1, the
> CLKOUT output is inhibited". But in reality the setting is exactly
> opposite.
> 
> Before now, the clock output was not really used, but on the rk3288 soc
> this generated clock is used to supply the temperature sensor block and
> the swapped bit value prevented it from working. With the corrected value,
> the tsadc now reports correct values.
> 
> Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

Should that patch be applied on any stable version too?


-- 
Alexandre Belloni, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com