* Re: [PATCH] hwmon: adc128d818: Fix value read from Device Tree [not found] <FR1P152MB28554B3FC5B4F6303019337993490@FR1P152MB2855.LAMP152.PROD.OUTLOOK.COM> @ 2019-03-12 15:26 ` Guenter Roeck 2019-03-12 16:32 ` Guenter Roeck [not found] ` <FR1P152MB2855A1DEBC01147732B69EC893490@FR1P152MB2855.LAMP152.PROD.OUTLOOK.COM> 0 siblings, 2 replies; 4+ messages in thread From: Guenter Roeck @ 2019-03-12 15:26 UTC (permalink / raw) To: Carlos Menin; +Cc: Jean Delvare, linux-hwmon@vger.kernel.org On Tue, Mar 12, 2019 at 01:14:39PM +0000, Carlos Menin wrote: > Cells in DT are 32-bits in size. of_property_read_u8() does not work > properly as it returns incorrect values in little-endian architectures. > Fix it by using of_property_read_u32() instead. > Are you saying that pretty much all callers of of_property_read_u8() have this problem ? I would not rule that out, but it seems hard to believe. Guenter > Signed-off-by: Carlos Menin <carlos.menin@outlook.com> > --- > drivers/hwmon/adc128d818.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/drivers/hwmon/adc128d818.c b/drivers/hwmon/adc128d818.c > index ca794bf..b5eb3c0 100644 > --- a/drivers/hwmon/adc128d818.c > +++ b/drivers/hwmon/adc128d818.c > @@ -70,7 +70,7 @@ struct adc128_data { > struct regulator *regulator; > int vref; /* Reference voltage in mV */ > struct mutex update_lock; > - u8 mode; /* Operation mode */ > + u32 mode; /* Operation mode */ > bool valid; /* true if following fields are valid */ > unsigned long last_updated; /* In jiffies */ > > @@ -467,7 +467,7 @@ static int adc128_probe(struct i2c_client *client, > } > > /* Operation mode is optional. If unspecified, keep current mode */ > - if (of_property_read_u8(dev->of_node, "ti,mode", &data->mode) == 0) { > + if (of_property_read_u32(dev->of_node, "ti,mode", &data->mode) == 0) { > if (data->mode > 3) { > dev_err(dev, "invalid operation mode %d\n", > data->mode); > -- > 2.7.4 > ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] hwmon: adc128d818: Fix value read from Device Tree 2019-03-12 15:26 ` [PATCH] hwmon: adc128d818: Fix value read from Device Tree Guenter Roeck @ 2019-03-12 16:32 ` Guenter Roeck [not found] ` <FR1P152MB2855A1DEBC01147732B69EC893490@FR1P152MB2855.LAMP152.PROD.OUTLOOK.COM> 1 sibling, 0 replies; 4+ messages in thread From: Guenter Roeck @ 2019-03-12 16:32 UTC (permalink / raw) To: Carlos Menin Cc: Jean Delvare, linux-hwmon@vger.kernel.org, Rob Herring, devicetree Copying DT maintainer and mailing list. On Tue, Mar 12, 2019 at 08:26:58AM -0700, Guenter Roeck wrote: > On Tue, Mar 12, 2019 at 01:14:39PM +0000, Carlos Menin wrote: > > Cells in DT are 32-bits in size. of_property_read_u8() does not work > > properly as it returns incorrect values in little-endian architectures. > > Fix it by using of_property_read_u32() instead. > > > Are you saying that pretty much all callers of of_property_read_u8() > have this problem ? I would not rule that out, but it seems hard to > believe. > > Guenter > > > Signed-off-by: Carlos Menin <carlos.menin@outlook.com> > > --- > > drivers/hwmon/adc128d818.c | 4 ++-- > > 1 file changed, 2 insertions(+), 2 deletions(-) > > > > diff --git a/drivers/hwmon/adc128d818.c b/drivers/hwmon/adc128d818.c > > index ca794bf..b5eb3c0 100644 > > --- a/drivers/hwmon/adc128d818.c > > +++ b/drivers/hwmon/adc128d818.c > > @@ -70,7 +70,7 @@ struct adc128_data { > > struct regulator *regulator; > > int vref; /* Reference voltage in mV */ > > struct mutex update_lock; > > - u8 mode; /* Operation mode */ > > + u32 mode; /* Operation mode */ > > bool valid; /* true if following fields are valid */ > > unsigned long last_updated; /* In jiffies */ > > > > @@ -467,7 +467,7 @@ static int adc128_probe(struct i2c_client *client, > > } > > > > /* Operation mode is optional. If unspecified, keep current mode */ > > - if (of_property_read_u8(dev->of_node, "ti,mode", &data->mode) == 0) { > > + if (of_property_read_u32(dev->of_node, "ti,mode", &data->mode) == 0) { > > if (data->mode > 3) { > > dev_err(dev, "invalid operation mode %d\n", > > data->mode); > > -- > > 2.7.4 > > ^ permalink raw reply [flat|nested] 4+ messages in thread
[parent not found: <FR1P152MB2855A1DEBC01147732B69EC893490@FR1P152MB2855.LAMP152.PROD.OUTLOOK.COM>]
* Re: [PATCH] hwmon: adc128d818: Fix value read from Device Tree [not found] ` <FR1P152MB2855A1DEBC01147732B69EC893490@FR1P152MB2855.LAMP152.PROD.OUTLOOK.COM> @ 2019-03-12 17:37 ` Guenter Roeck [not found] ` <RO1P152MB18680981A9B2DF488642C825935F0@RO1P152MB1868.LAMP152.PROD.OUTLOOK.COM> 0 siblings, 1 reply; 4+ messages in thread From: Guenter Roeck @ 2019-03-12 17:37 UTC (permalink / raw) To: Carlos Menin Cc: Jean Delvare, Rob Herring, linux-hwmon@vger.kernel.org, devicetree@vger.kernel.org On Tue, Mar 12, 2019 at 05:10:48PM +0000, Carlos Menin wrote: > On Tue, Mar 12, 2019 at 08:26:58AM -0700, Guenter Roeck wrote: > > On Tue, Mar 12, 2019 at 01:14:39PM +0000, Carlos Menin wrote: > > > Cells in DT are 32-bits in size. of_property_read_u8() does not work > > > properly as it returns incorrect values in little-endian architectures. > > > Fix it by using of_property_read_u32() instead. > > > > > Are you saying that pretty much all callers of of_property_read_u8() > > have this problem ? I would not rule that out, but it seems hard to > > believe. > > > > Guenter > > > > Hi Guenter, > > Yes, unless the DT entry specifies the cell size with '/bits/ 8' prefix. > Not many drivers calls of_property_read_u8() function, almost all of > them have this prefix in their binding examples, this being one of the > exceptions. The fix could be a change in the documentation instead, if > that is preferred. > Yes, I would very much prefer that. Guenter > Carlos > > > > Signed-off-by: Carlos Menin <carlos.menin@outlook.com> > > > --- > > > drivers/hwmon/adc128d818.c | 4 ++-- > > > 1 file changed, 2 insertions(+), 2 deletions(-) > > > > > > diff --git a/drivers/hwmon/adc128d818.c b/drivers/hwmon/adc128d818.c > > > index ca794bf..b5eb3c0 100644 > > > --- a/drivers/hwmon/adc128d818.c > > > +++ b/drivers/hwmon/adc128d818.c > > > @@ -70,7 +70,7 @@ struct adc128_data { > > > struct regulator *regulator; > > > int vref; /* Reference voltage in mV */ > > > struct mutex update_lock; > > > - u8 mode; /* Operation mode */ > > > + u32 mode; /* Operation mode */ > > > bool valid; /* true if following fields are valid */ > > > unsigned long last_updated; /* In jiffies */ > > > > > > @@ -467,7 +467,7 @@ static int adc128_probe(struct i2c_client *client, > > > } > > > > > > /* Operation mode is optional. If unspecified, keep current mode */ > > > - if (of_property_read_u8(dev->of_node, "ti,mode", &data->mode) == 0) { > > > + if (of_property_read_u32(dev->of_node, "ti,mode", &data->mode) == 0) { > > > if (data->mode > 3) { > > > dev_err(dev, "invalid operation mode %d\n", > > > data->mode); > > > -- > > > 2.7.4 > > > ^ permalink raw reply [flat|nested] 4+ messages in thread
[parent not found: <RO1P152MB18680981A9B2DF488642C825935F0@RO1P152MB1868.LAMP152.PROD.OUTLOOK.COM>]
* Re: [PATCH] hwmon: adc128d818: Fix value read from Device Tree [not found] ` <RO1P152MB18680981A9B2DF488642C825935F0@RO1P152MB1868.LAMP152.PROD.OUTLOOK.COM> @ 2019-03-26 18:03 ` Guenter Roeck 0 siblings, 0 replies; 4+ messages in thread From: Guenter Roeck @ 2019-03-26 18:03 UTC (permalink / raw) To: Carlos Menin Cc: Jean Delvare, Rob Herring, linux-hwmon@vger.kernel.org, devicetree@vger.kernel.org On Tue, Mar 26, 2019 at 12:01:57PM +0000, Carlos Menin wrote: > On Tue, Mar 12, 2019 at 10:37:04AM -0700, Guenter Roeck wrote: > > On Tue, Mar 12, 2019 at 05:10:48PM +0000, Carlos Menin wrote: > > > On Tue, Mar 12, 2019 at 08:26:58AM -0700, Guenter Roeck wrote: > > > > On Tue, Mar 12, 2019 at 01:14:39PM +0000, Carlos Menin wrote: > > > > > Cells in DT are 32-bits in size. of_property_read_u8() does not work > > > > > properly as it returns incorrect values in little-endian architectures. > > > > > Fix it by using of_property_read_u32() instead. > > > > > > > > > Are you saying that pretty much all callers of of_property_read_u8() > > > > have this problem ? I would not rule that out, but it seems hard to > > > > believe. > > > > > > > > Guenter > > > > > > > > > > Hi Guenter, > > > > > > Yes, unless the DT entry specifies the cell size with '/bits/ 8' prefix. > > > Not many drivers calls of_property_read_u8() function, almost all of > > > them have this prefix in their binding examples, this being one of the > > > exceptions. The fix could be a change in the documentation instead, if > > > that is preferred. > > > > > > > Yes, I would very much prefer that. > > > > Guenter > > > > Hi, > > I sent a patch with the modification in the dt binding for this device, > a couple weeks ago, but since e-mails from this address are rejected by > vger.kernel.org, I used a differente e-mail address (one that I made > sure that is accepted), if that is ok. > Yes, it is available at https://patchwork.kernel.org/patch/10851189/ It is waiting for DT maintainer approval. Guenter > Best regards, > Carlos. > > > > > Carlos > > > > > > > > Signed-off-by: Carlos Menin <carlos.menin@outlook.com> > > > > > --- > > > > > drivers/hwmon/adc128d818.c | 4 ++-- > > > > > 1 file changed, 2 insertions(+), 2 deletions(-) > > > > > > > > > > diff --git a/drivers/hwmon/adc128d818.c b/drivers/hwmon/adc128d818.c > > > > > index ca794bf..b5eb3c0 100644 > > > > > --- a/drivers/hwmon/adc128d818.c > > > > > +++ b/drivers/hwmon/adc128d818.c > > > > > @@ -70,7 +70,7 @@ struct adc128_data { > > > > > struct regulator *regulator; > > > > > int vref; /* Reference voltage in mV */ > > > > > struct mutex update_lock; > > > > > - u8 mode; /* Operation mode */ > > > > > + u32 mode; /* Operation mode */ > > > > > bool valid; /* true if following fields are valid */ > > > > > unsigned long last_updated; /* In jiffies */ > > > > > > > > > > @@ -467,7 +467,7 @@ static int adc128_probe(struct i2c_client *client, > > > > > } > > > > > > > > > > /* Operation mode is optional. If unspecified, keep current mode */ > > > > > - if (of_property_read_u8(dev->of_node, "ti,mode", &data->mode) == 0) { > > > > > + if (of_property_read_u32(dev->of_node, "ti,mode", &data->mode) == 0) { > > > > > if (data->mode > 3) { > > > > > dev_err(dev, "invalid operation mode %d\n", > > > > > data->mode); > > > > > -- > > > > > 2.7.4 > > > > > ^ permalink raw reply [flat|nested] 4+ messages in thread
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2019-03-12 15:26 ` [PATCH] hwmon: adc128d818: Fix value read from Device Tree Guenter Roeck
2019-03-12 16:32 ` Guenter Roeck
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2019-03-12 17:37 ` Guenter Roeck
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2019-03-26 18:03 ` Guenter Roeck
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