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Message-ID: <53DA9709.10602@suse.de>
Date: Thu, 31 Jul 2014 21:20:41 +0200
From: Andreas Färber <afaerber@...e.de>
To: Tomasz Figa <tomasz.figa@...il.com>,
linux-samsung-soc@...r.kernel.org
CC: linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
Stephan van Schaik <stephan@...khronix.com>,
Vincent Palatin <vpalatin@...omium.org>,
Doug Anderson <dianders@...omium.org>,
Javier Martinez Canillas <javier.martinez@...labora.co.uk>,
Rob Herring <robh+dt@...nel.org>,
Pawel Moll <pawel.moll@....com>,
Mark Rutland <mark.rutland@....com>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
Kumar Gala <galak@...eaurora.org>,
Russell King <linux@....linux.org.uk>,
Ben Dooks <ben-linux@...ff.org>,
Kukjin Kim <kgene.kim@...sung.com>,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 4/4] ARM: dts: Add exynos5250-spring device tree
Hi Tomasz,
Am 31.07.2014 21:05, schrieb Tomasz Figa:
> Hi Andreas,
>
> Sorry for joining the party a bit late, but there were patches with less
> people involved so I preferred to review them first.
>
> You can find my comments inline.
>
> On 31.07.2014 18:08, Andreas Färber wrote:
>> Adds initial support for the HP Chromebook 11.
>
> [snip]
>
>> + gpio-keys {
>> + compatible = "gpio-keys";
>> + pinctrl-names = "default";
>> + pinctrl-0 = <&power_key_irq>, <&lid_irq>;
>> +
>> + power {
>> + label = "Power";
>> + gpios = <&gpx1 3 GPIO_ACTIVE_LOW>;
>> + linux,code = <KEY_POWER>;
>
> I assume the key is debounced in hardware, so there is no need for
> debounce-interval here. Is this correct?
You're asking the wrong person... This is copied from
-cros-common/-snow. Downstream 3.8 does not have a debounce-interval
property.
>
>> + gpio-key,wakeup;
>> + };
>> +
>> + lid-switch {
>> + label = "Lid";
>> + gpios = <&gpx3 5 GPIO_ACTIVE_LOW>;
>> + linux,input-type = <5>; /* EV_SW */
>> + linux,code = <0>; /* SW_LID */
>> + debounce-interval = <1>;
>> + gpio-key,wakeup;
>> + };
>> + };
>> +
>> + usb3_vbus_reg: regulator-usb3 {
>> + compatible = "regulator-fixed";
>> + regulator-name = "P5.0V_USB3CON";
>> + regulator-min-microvolt = <5000000>;
>> + regulator-max-microvolt = <5000000>;
>> + gpio = <&gpe1 0 GPIO_ACTIVE_LOW>;
>> + enable-active-high;
>> + };
>> +
>> + usb@...10000 {
>
> Since this is a brand new dts file, it should use the reference based
> syntax, which would be something like
>
> &usbhost {
> ...
> };
>
> below the / { ... }; block.
You will find that I already did that for all nodes that have a label.
Since there are lots of usb nodes, please suggest specific label names.
I originally tried to stay out of existing code, then I was asked to fix
-cros-common, clean up -snow too, now the SoC, ... ;)
>> + samsung,vbus-gpio = <&gpx1 1 GPIO_ACTIVE_HIGH>;
>> + };
>> +
>> + usb-hub {
>> + compatible = "smsc,usb3503a";
>> + reset-gpios = <&hsic_reset>;
>
> Hmm, why a -gpios property points to a pinctrl node? Shouldn't there be
> a phandle to GPIO bank + GPIO specifier instead?
Dunno, can change it. Can I just copy the gpio property from the
regulator above?
>> + };
>> +
>> + fixed-rate-clocks {
>> + xxti {
>> + compatible = "samsung,clock-xxti";
>> + clock-frequency = <24000000>;
>> + };
>> + };
>
> This is also referencing a node from higher level, so it should be done
> using a reference.
>
>> +
>> + hdmi {
>> + hpd-gpio = <&gpx3 7 GPIO_ACTIVE_HIGH>;
>> + pinctrl-names = "default";
>> + pinctrl-0 = <&hdmi_hpd_irq>;
>> + phy = <&hdmiphy>;
>> + ddc = <&i2c_2>;
>> + hdmi-en-supply = <&s5m_ldo8_reg>;
>> + vdd-supply = <&s5m_ldo8_reg>;
>> + vdd_osc-supply = <&s5m_ldo10_reg>;
>> + vdd_pll-supply = <&s5m_ldo8_reg>;
>> + };
>
> Ditto.
hdmi?
>
>> +
>> + fimd@...00000 {
>> + status = "okay";
>> + samsung,invert-vclk;
>> + };
>
> Ditto.
fimd?
>
>> +
>> + dp-controller@...B0000 {
>> + status = "okay";
>> + pinctrl-names = "default";
>> + pinctrl-0 = <&dp_hpd>;
>> + samsung,color-space = <0>;
>> + samsung,dynamic-range = <0>;
>> + samsung,ycbcr-coeff = <0>;
>> + samsung,color-depth = <1>;
>> + samsung,link-rate = <0x0a>;
>> + samsung,lane-count = <1>;
>> + samsung,hpd-gpio = <&gpc3 0 GPIO_ACTIVE_HIGH>;
>> + };
>
> Ditto.
dp_controller? display_port_controller?
>
>> +};
>> +
>> +&dp_hpd {
>> + samsung,pins = "gpc3-0";
>> + samsung,pin-function = <0>;
>> + samsung,pin-pud = <3>;
>> + samsung,pin-drv = <0>;
>> +};
>
> Hmm, what node is this referencing? I believe this should rather
> reference the pin controller and add a new board-specific pinconf/pinmux
> group instead....
It's a -pinctrl node. See v3->v4 change log and discussion on v3.
>> +
>> +&i2c_0 {
>> + status = "okay";
>> + samsung,i2c-sda-delay = <100>;
>> + samsung,i2c-max-bus-freq = <378000>;
>
> [snip]
>
>> +/*
>> + * Disabled pullups since external part has its own pullups and
>> + * double-pulling gets us out of spec in some cases.
>> + */
>> +&i2c2_bus {
>> + samsung,pin-pud = <0>;
>> +};
>
> OK, here overriding a generic pinconf group is justified and nicely
> explained by a comment.
You seem to assume that I actually understand these things. ;)
Just copied from -cros-common/-snow.
>> +
>> +&i2c_2 {
>> + status = "okay";
>> + samsung,i2c-sda-delay = <100>;
>> + samsung,i2c-max-bus-freq = <66000>;
>> +
>> + hdmiddc@50 {
>> + compatible = "samsung,exynos4210-hdmiddc";
>> + reg = <0x50>;
>> + };
>
> I don't think this matches current Exynos HDMI bindings, which I believe
> have been changed to just take a phandle to i2c bus instead.
Copied from -cros-common/-snow.
>> +};
>> +
>> +&i2c_3 {
>> + status = "okay";
>> + samsung,i2c-sda-delay = <100>;
>> + samsung,i2c-max-bus-freq = <66000>;
>> +};
>
> [snip]
>
>> +&sd1_clk {
>> + samsung,pin-drv = <0>;
>> +};
>> +
>> +&sd1_cmd {
>> + samsung,pin-pud = <3>;
>> + samsung,pin-drv = <0>;
>> +};
>> +
>> +&sd1_cd {
>> + samsung,pin-drv = <0>;
>> +};
>> +
>> +&sd1_bus4 {
>> + samsung,pin-drv = <0>;
>> +};
>
> Here generic settings are being overridden, so it might be a good idea
> to explain why, like with i2c pull-up above.
Snow does not have an explanation either, so please suggest what comment
you'd like to see. Consider me just a user with no specs. :)
Cheers,
Andreas
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