linux-kernel - Re: [PATCH 02/11] MIPS: qi_lb60: Migrate to devicetree

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Date:   Thu, 25 Jul 2019 20:09:41 -0400
From:   Paul Cercueil <paul@...pouillou.net>
To:     Paul Burton <paul.burton@...s.com>
Cc:     Ralf Baechle <ralf@...ux-mips.org>,
        James Hogan <jhogan@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Vinod Koul <vkoul@...nel.org>,
        Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Lee Jones <lee.jones@...aro.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Sebastian Reichel <sre@...nel.org>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>, od@...c.me,
        devicetree@...r.kernel.org, linux-mips@...r.kernel.org,
        linux-kernel@...r.kernel.org, dmaengine@...r.kernel.org,
        linux-hwmon@...r.kernel.org, linux-mtd@...ts.infradead.org,
        linux-pm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-fbdev@...r.kernel.org, alsa-devel@...a-project.org,
        Artur Rojek <contact@...ur-rojek.eu>
Subject: Re: [PATCH 02/11] MIPS: qi_lb60: Migrate to devicetree



Le jeu. 25 juil. 2019 à 19:47, Paul Burton <paul.burton@...s.com> a 
écrit :
> Hi Paul,
> 
> On Thu, Jul 25, 2019 at 06:02:06PM -0400, Paul Cercueil wrote:
>>  Move all the platform data to devicetree.
> 
> Nice! :)
> 
>>  The only bit dropped is the PWM beeper, which requires the PWM 
>> driver
>>  to be updated. I figured it's okay to remove it here since it's 
>> really
>>  a non-critical device, and it'll be re-introduced soon enough.
> 
> OK, I can see that being a price worth paying. Though it's possible to
> include the binding at least for that in this series I'd be even
> happier. Actually I see we already have
> 
>   Documentation/devicetree/bindings/pwm/ingenic,jz47xx-pwm.txt
> 
> in mainline - what needs to change with it?

The PWM driver will be updated to use the TCU clocks and the regmap 
provided
by the TCU driver. The PWM node will be a sub-node of the TCU one.

Additionally, there is this[1] ongoing discussion about PWM which makes
me uneasy about how to write the binding. So I'd rather not rush it,
because once the devicetree is written, it's ABI.

[1]: https://lkml.org/lkml/2019/5/22/607


>>  +	spi {
>>  +		compatible = "spi-gpio";
>>  +		#address-cells = <1>;
>>  +		#size-cells = <0>;
>>  +
>>  +		sck-gpios = <&gpc 23 GPIO_ACTIVE_HIGH>;
>>  +		mosi-gpios = <&gpc 22 GPIO_ACTIVE_HIGH>;
>>  +		cs-gpios = <&gpc 21 GPIO_ACTIVE_LOW>;
>>  +		num-chipselects = <1>;
>>  +
>>  +		spi@0 {
>>  +			compatible = "ili8960";
> 
> Should this be "ilitek,ili8960"?
> 
> Is there a binding & driver for this submitted somewhere? If not then 
> do
> we need this at all? It doesn't look like the existing platform data
> would actually lead to a driver being loaded so I'm wondering if we 
> can
> just drop this until such a driver (or at least a documented DT 
> binding)
> exists.

I can drop it. There is no driver for it, and I'm not even sure the LB60
has a ILI8960 in the first place.


> Thanks,
>     Paul