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Message-ID: <CA+V-a8tQCfXfvrGJN_xKO=aYMeo=dTzJ_U5iXQyybf2nWHWQcA@mail.gmail.com>
Date: Mon, 15 Jul 2013 20:06:36 +0530
From: Prabhakar Lad <prabhakar.csengg@...il.com>
To: Sylwester Nawrocki <sylvester.nawrocki@...il.com>
Cc: LMML <linux-media@...r.kernel.org>,
DLOS <davinci-linux-open-source@...ux.davincidsp.com>,
LKML <linux-kernel@...r.kernel.org>,
devicetree-discuss@...ts.ozlabs.org
Subject: Re: [PATCH v2] media: i2c: adv7343: add OF support
Hi Sylwester,
Thanks for the review.
On Mon, Jul 15, 2013 at 2:03 AM, Sylwester Nawrocki
<sylvester.nawrocki@...il.com> wrote:
> Hi Prabhakar,
>
>
> On 07/13/2013 01:12 PM, Prabhakar Lad wrote:
>>
>> From: "Lad, Prabhakar"<prabhakar.csengg@...il.com>
>>
>> add OF support for the adv7343 driver.
>>
>> Signed-off-by: Lad, Prabhakar<prabhakar.csengg@...il.com>
>> ---
>> Changes for v2:
>> 1: Fixed naming of properties.
>>
>> .../devicetree/bindings/media/i2c/adv7343.txt | 54
>> ++++++++++++++++
>> drivers/media/i2c/adv7343.c | 65
>> +++++++++++++++++++-
>> 2 files changed, 118 insertions(+), 1 deletion(-)
>> create mode 100644
>> Documentation/devicetree/bindings/media/i2c/adv7343.txt
>>
>> diff --git a/Documentation/devicetree/bindings/media/i2c/adv7343.txt
>> b/Documentation/devicetree/bindings/media/i2c/adv7343.txt
>> new file mode 100644
>> index 0000000..1d2e854
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/media/i2c/adv7343.txt
>> @@ -0,0 +1,54 @@
>> +* Analog Devices adv7343 video encoder
>> +
>> +The ADV7343 are high speed, digital-to-analog video encoders in a 64-lead
>> LQFP
>> +package. Six high speed, 3.3 V, 11-bit video DACs provide support for
>> composite
>> +(CVBS), S-Video (Y-C), and component (YPrPb/RGB) analog outputs in
>> standard
>> +definition (SD), enhanced definition (ED), or high definition (HD) video
>> +formats.
>> +
>> +Required Properties :
>> +- compatible: Must be "ad,adv7343"
>
>
> Please have a look at Documentation/devicetree/bindings/vendor-prefixes.txt.
> 'ad' is a vendor prefix reserved for "Avionic Design GmbH".
> For "Analog Devices, Inc." 'adi' should be used.
>
> If I would have to draft a new DT binding proposal checklist checking
> vendor-prefixes.txt would certainly be one of the first steps.
>
That makes it easier I wasn’t aware of this file thanks :)
>
>> +Optional Properties :
>> +- ad,adv7343-power-mode-sleep-mode: on enable the current consumption is
>> + reduced to micro ampere level. All
>> DACs and
>> + the internal PLL circuit are
>> disabled.
>> +- ad,adv7343-power-mode-pll-ctrl: PLL and oversampling control. This
>> control
>> + allows internal PLL 1 circuit to be
>> powered
>> + down and the oversampling to beswitched
>> off.
>> +- ad,adv7343-power-mode-dac-1: power on/off DAC 1, 0 = OFF and 1 = ON.
>> +- ad,adv7343-power-mode-dac-2: power on/off DAC 2, 0 = OFF and 1 = ON.
>> +- ad,adv7343-power-mode-dac-3: power on/off DAC 3, 0 = OFF and 1 = ON.
>> +- ad,adv7343-power-mode-dac-4: power on/off DAC 4, 0 = OFF and 1 = ON.
>> +- ad,adv7343-power-mode-dac-5: power on/off DAC 5, 0 = OFF and 1 = ON.
>> +- ad,adv7343-power-mode-dac-6: power on/off DAC 6, 0 = OFF and 1 = ON.
>> +- ad,adv7343-sd-config-dac-out-1: Configure SD DAC Output 1.
>> +- ad,adv7343-sd-config-dac-out-2: Configure SD DAC Output 2.
>
>
> All these properties look more like hardware configuration, rather than
> hardware description. So at first sight I would say none of these properties
> is suitable for the device tree.
>
> sleep mode and pll ctrl should likely only have default values in the
> driver.
> sleep-mode disables all DAC, while power-mode-dac-? does power on/off
> (enables / disables?) individual DACs. How those properties interact, what's
> going on here exactly ? :)
>
Agreed the device tree is meant to describe the hardware, basically the the need
had arrived since the adv7343 is present on DM6467 EVM and also on the
OMAP-L138 EVM, the configuration of this two register's differs on these
two evm's mentioned, because of which this is now being passed as part of
the device tree.
> That said, how about only leaving the properties indicating which DACs
> (including SD DACs) should be enabled ? E.g.
>
> adi,dac-enable - an array indicating which DACs are enabled, in order
> DAC1...DAC6, 1 to enable DAC, 0 to disable.
>
OK
> adi,sd-dac-enable - an array indicating which SD DACs are enabled, in order
> DAC1...DAC2, 1 to enable SD DAC, 0 to disable.
>
OK
> Please note you don't need ",adv7343-" prefix in each single property
> for that device.
>
Agreed.
>
>> +Example:
>> +
>> +i2c0@...2000 {
>> + ...
>> + ...
>> +
>> + adv7343@2a {
>> + compatible = "ad,adv7343";
>> + reg =<0x2a>;
>> +
>> + port {
>> + adv7343_1: endpoint {
>> + ad,adv7343-power-mode-sleep-mode;
>> + ad,adv7343-power-mode-pll-ctrl;
>> + ad,adv7343-power-mode-dac-1;
>> + ad,adv7343-power-mode-dac-2;
>> + ad,adv7343-power-mode-dac-3;
>> + ad,adv7343-power-mode-dac-4;
>> + ad,adv7343-power-mode-dac-5;
>> + ad,adv7343-power-mode-dac-6;
>
>
> Then this would have become:
> adi,dac-enable = <1 1 1 1 1 1>;
>
> But I would put some disabled DACs in the example as well:
>
OK will do that.
> /* Use DAC1..3, DAC6 */
> adi,dac-enable = <1 1 1 0 0 1>;
>
>> + ad,adv7343-sd-config-dac-out-1;
>> + ad,adv7343-sd-config-dac-out-2;
>
>
> And this:
> adi,sd-dac-enable = <1 1>;
>
Ok.
>
>> + };
>> + };
>> + };
>> + ...
>> +};
[snip]
>> + pdata->mode_config.dac_6 =
>> + of_property_read_bool(np, "ad,adv7343-power-mode-dac-6");
>> +
>> + pdata->sd_config.sd_dac_out1 =
>> + of_property_read_bool(np,
>> "ad,adv7343-sd-config-dac-out-1");
>> +
>> + pdata->sd_config.sd_dac_out2 =
>> + of_property_read_bool(np,
>> "ad,adv7343-sd-config-dac-out-2");
>
>
> This doesn't look very impressive. IMHO changing
> pdata->mode_config.{dac,sd_dac}
> to an array type could simplify this code a little. But you could as well
> use
> of_property_read_u32_array() and assign each element to corresponding
> mode_config.(sd_)dac field.
>
OK.
Regards,
--Prabhakar Lad
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