linux-kernel - Re: [PATCH 1/3] ARM: dts: omap5-board-common: enable rtc and charging of backup battery

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Date:	Wed, 13 Jan 2016 11:25:38 +0100
From:	"H. Nikolaus Schaller" <hns@...delico.com>
To:	Tony Lindgren <tony@...mide.com>
Cc:	Laxman Dewangan <ldewangan@...dia.com>, Nishanth Menon <nm@...com>,
	Benoît Cousson <bcousson@...libre.com>,
	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>,
	linux-omap <linux-omap@...r.kernel.org>,
	devicetree@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	Marek Belisko <marek@...delico.com>,
	Gražvydas Ignotas <notasas@...il.com>
Subject: Re: [PATCH 1/3] ARM: dts: omap5-board-common: enable rtc and charging of backup battery

Hi Tony,

Am 12.01.2016 um 22:27 schrieb H. Nikolaus Schaller <hns@...delico.com>:

> Hi Tony,
> 
> Am 12.01.2016 um 14:30 schrieb H. Nikolaus Schaller <hns@...delico.com>:
> 
>> Hi Tony,
>> 
>> Am 12.01.2016 um 01:09 schrieb Tony Lindgren <tony@...mide.com>:
>> 
>>> * Tony Lindgren <tony@...mide.com> [160111 12:27]:
>>>> 
>>>> OK so the issue is that the twl msecure pin should be high to enable
>>>> the RTC registers. We used to have that code with platform_data, but
>>>> no longer have it with device tree based booting. I'll send a patch
>>>> for that.
>>>> 
>>>> Curiously setting jumper j5 on beagle-x15 that controls what used to
>>>> be the msecure and now is powerhold, does the opposite.. The
>>>> device boots automatically but RTC is stopped?
>>> 
>>> And here's a fix the issue for omap5. Beagle-x15 needs to be
>>> investigated more.
>>> 
>>> Care to test it with your RTC enabling patch?
>> 
>> yes, I will test asap.
>> 
>> Reminds me on some issues we did have with msecure and twl4030 rtc some years ago.
> 
> Ok, works for me on OMAP5432EVM.

Yes, it works, but I didn't look into the code yet.

> 
> Thanks for spotting the issue.
> 
>> 
>> BR,
>> Nikolaus
>> 
>>> 
>>> Regards,
>>> 
>>> Tony
>>> 
>>> 8< ---------------
>>> From: Tony Lindgren <tony@...mide.com>
>>> Date: Mon, 11 Jan 2016 14:35:24 -0800
>>> Subject: [PATCH] ARM: dts: Fix omap5 PMIC control lines for RTC writes
>>> 
>>> The palmas PMIC has some control lines that need to be muxed properly
>>> for things to work. The sys_nirq pin is used for interrupts, and msecure
>>> pin is used for enabling writes to some PMIC registers.
>>> 
>>> Without these pins configured properly things can fail in mysterious
>>> ways. For example, we can't update the RTC registers on palmas PMIC
>>> unless the msecure pin is configured. And this is probably the reason
>>> why we had RTC missing from the omap5 dts file.
>>> 
>>> According to "OMAP5430 ES2.0 Data Manual [Public] VErsion A (Rev. F)"
>>> swps052f.pdf, mux mode 1 is for sys_drm_msecure so there's no need to
>>> configure it as a GPIO pin.
>>> 
>>> Signed-off-by: Tony Lindgren <tony@...mide.com>
>>> 
>>> --- a/arch/arm/boot/dts/omap5-board-common.dtsi
>>> +++ b/arch/arm/boot/dts/omap5-board-common.dtsi
>>> @@ -213,6 +213,12 @@
>>> 		>;
>>> 	};
>>> 
>>> +	palmas_msecure_pins: palmas_msecure_pins {
>>> +		pinctrl-single,pins = <
>>> +			OMAP5_IOPAD(0x180, PIN_OUTPUT | MUX_MODE1) /* gpio8_234.sys_drm_msecure */

I wonder now what MODE1 is.

In my OMAP5 TRM (Version "Y" - may be too old) the MODE1 is tagged as "reserved".

Maybe "reserved" happens to output a "1" on OMAP5 and a "0" on the X15?

And as far as I am aware there is no "driver" for some MSECURE module (but I don't know the details of MSECURE control by software).

This one

>>> 		OMAP5_IOPAD(0x180, PIN_INPUT _PULLUP | MUX_MODE6) /* gpio8_234 used for sys_drm_msecure */


works for me on the OMAP5 EVM as well.

BR,
Nikolaus

>>> +		>;
>>> +	};
>>> +
>>> 	usbhost_pins: pinmux_usbhost_pins {
>>> 		pinctrl-single,pins = <
>>> 			0x84 (PIN_INPUT | MUX_MODE0) /* usbb2_hsic_strobe */
>>> @@ -278,6 +284,12 @@
>>> 			&usbhost_wkup_pins
>>> 	>;
>>> 
>>> +	palmas_sys_nirq_pins: pinmux_palmas_sys_nirq_pins {
>>> +		pinctrl-single,pins = <
>>> +			OMAP5_IOPAD(0x068, PIN_INPUT_PULLUP | MUX_MODE0) /* sys_nirq1 */
>>> +		>;
>>> +	};
>>> +
>>> 	usbhost_wkup_pins: pinmux_usbhost_wkup_pins {
>>> 		pinctrl-single,pins = <
>>> 			0x1A (PIN_OUTPUT | MUX_MODE0) /* fref_clk1_out, USB hub clk */
>>> @@ -345,6 +357,8 @@
>>> 		interrupt-controller;
>>> 		#interrupt-cells = <2>;
>>> 		ti,system-power-controller;
>>> +		pinctrl-names = "default";
>>> +		pinctrl-0 = <&palmas_sys_nirq_pins &palmas_msecure_pins>;
>>> 
>>> 		extcon_usb3: palmas_usb {
>>> 			compatible = "ti,palmas-usb-vid";
>> 
>