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SubjectRe: [PATCHv1 0/6] leds: pca9653x: support inverted outputs and cleanups
Hi Ollivier

Sorry to not reply to the patches, but I am not subscribed to linux-leds

[PATCH 2/6] leds: pca963x: Lock i2c r/w access

I am not sure why this patch is needed. the only thing that should be
protected is the write to ledout.

It seems that mode2 needs to be set to PCA963X_MODE2_DMBLNK, or at
least, the driver never clears that bit. Couldnt we just set it at
probe time and remove the read/write of it? I do not have the hardware
at the moment, so it should be something that you need to test.

[PATCH 4/6] leds: pca963x: Reduce magic values
Maybe you want to create the inverse macro of PCA963X_LEDOUT_LDR, so
you can do something linke

PCA963X_LEDOUT_LDR_INV(ledout, pca963x->led_num) != PCA963X_LEDOUT_LED_GRP_PWM

[PATCH 3/6] leds: pca963x: Add defines and remove some magic values

I am not big fan of defining things that are not used. and the magic
assigment to n_leds is perfectly fine IMHO

For PCA963X_LEDOUT_LDR. Do not forget the parenthesis around led_num.
Also replace %4 with &3 to be consisten.t


On Tue, Apr 19, 2016 at 11:39 AM, Olliver Schinagl <> wrote:
> On 19-04-16 11:23, Jacek Anaszewski wrote:
>> Hi Olliver,
>> Thanks for the patches.
>> Adding driver authors on cc.
> Ah sorry about that, thanks. I guess get_maintainers doesn't do that.
> As for the compile bug, I'll fix that with v2, it only applies on the
> intermediate patches, not on the whole set.
> Olliver
>> On 04/19/2016 09:40 AM, Olliver Schinagl wrote:
>>> Using the pca963x for a while, I noticed something that may look like
>>> some
>>> i2c accessing issues where sometimes data was incorrectly written to the
>>> bus,
>>> possibly because we where not properly locking the i2c reads. Though I'm
>>> not
>>> familiar enough with the i2c framework to be certain reads need to be
>>> locked
>>> at all. A patch was added to properly lock i2c access more tightly.
>>> Furthermore there was no method to support inverted outputs. This series
>>> adds a property to the device tree to inform the driver that the output
>>> is inverted (active-high vs active-low).
>>> Additionally, this patch set does some cleanups to please checkpatch, and
>>> removes a few magic values.
>>> Olliver Schinagl (6):
>>> leds: pca963x: Alphabetize headers
>>> leds: pca963x: Lock i2c r/w access
>>> leds: pca963x: Add defines and remove some magic values
>>> leds: pca963x: Reduce magic values
>>> leds: pca963x: Inform the output that it is inverted
>>> leds: pca963x: Remove whitespace and checkpatch problems
>>> Documentation/devicetree/bindings/leds/pca963x.txt | 1 +
>>> drivers/leds/leds-pca963x.c | 243
>>> ++++++++++++++-------
>>> include/linux/platform_data/leds-pca963x.h | 1 +
>>> 3 files changed, 171 insertions(+), 74 deletions(-)

Ricardo Ribalda

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