linux-kernel - Re: [PATCH] pinctrl: sunxi: Add H3 R

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Date:	Tue, 2 Feb 2016 13:10:31 +0100
From:	Krzysztof Adamski <k@...ko.eu>
To:	Chen-Yu Tsai <wens@...e.org>
Cc:	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>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Russell King <linux@....linux.org.uk>,
	Linus Walleij <linus.walleij@...aro.org>,
	Hans de Goede <hdegoede@...hat.com>,
	Vishnu Patekar <vishnupatekar0510@...il.com>,
	Jens Kuske <jenskuske@...il.com>,
	devicetree <devicetree@...r.kernel.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	linux-sunxi <linux-sunxi@...glegroups.com>
Subject: Re: [PATCH] pinctrl: sunxi: Add H3 R_PIO controller support

On Tue, Feb 02, 2016 at 10:24:51AM +0100, Krzysztof Adamski wrote:
>On Tue, Feb 02, 2016 at 02:25:18PM +0800, Chen-Yu Tsai wrote:
>>On Mon, Feb 1, 2016 at 6:12 PM, Krzysztof Adamski <k@...ko.eu> wrote:
>>>- reg: Should contain the register physical address and length for 
>>>the
>>>diff --git a/arch/arm/boot/dts/sun8i-h3.dtsi
>>>b/arch/arm/boot/dts/sun8i-h3.dtsi
>>>index 1524130e..745f64c 100644
>>>--- a/arch/arm/boot/dts/sun8i-h3.dtsi
>>>+++ b/arch/arm/boot/dts/sun8i-h3.dtsi
>>>@@ -493,5 +493,17 @@
>>>                        interrupts = <GIC_SPI 40 IRQ_TYPE_LEVEL_HIGH>,
>>>                                     <GIC_SPI 41 IRQ_TYPE_LEVEL_HIGH>;
>>>                };
>>>+
>>>+               r_pio: pinctrl@...02c00 {
>>>+                       compatible = "allwinner,sun8i-h3-r-pinctrl";
>>>+                       reg = <0x01f02c00 0x400>;
>>>+                       interrupts = <GIC_SPI 45 IRQ_TYPE_LEVEL_HIGH>;
>>>+                       clocks = <&bus_gates 69>;
>>
>>This is probably wrong. According to other SoCs all R_ block peripherals
>>have clock gates and reset controls in the PRCM.
>
>This is problematic. I can find information about reset and gates control for
>this peripheral on other SoCs user manuals but there is nothing about it in H3
>User Manual
>(https://www.dropbox.com/s/nkr9slo1o9x6i1z/Allwinner_H3_Datasheet_V1.1.pdf?dl=0).
>
>Similarly, while I think I can find r_pio clock setup for A33:
>https://github.com/allwinner-zh/linux-3.4-sunxi/blob/master/drivers/clk/sunxi/clk-sun8iw5.c
>
>I can't find it for H3, though:
>https://github.com/allwinner-zh/linux-3.4-sunxi/blob/master/drivers/clk/sunxi/clk-sun8iw7.c
>
>Well, apart from this strange snippet:
>
>// binder r-pio CPUS_APB0_GATE to pio-clk's gate-reset-register
>   clk = clk_get(NULL,"pio");
>   if(!clk || IS_ERR(clk))
>       printk("Error not get clk pio\n");
>   else
>   {
>       struct clk_hw *hw = __clk_get_hw(clk);
>       struct sunxi_clk_periph *periph = to_clk_periph(hw);
>       struct sunxi_clk_periph_gate *gate = &periph->gate;
>       gate->reset = sunxi_clk_cpus_base+CPUS_APB0_GATE ;
>       gate->rst_shift = 0;
>       clk_put(clk);
>   }
>
>
>Which I have to admit I don't fully understand. This seems to be setting reset
>line for first pio, not for r_pio - something we don't have right now. Or am I
>wrong here?
>
>I'm new to Allwinner SoCs, any help from veterans?
>
>Also, if that proves anything, I did test this code on OrangePi PC and PL ports
>works so their clock is enabled, for sure.

I did some tests and indeed, when I disabled PIO clock (bus_gates 69), 
R_PIO was still working while PIO did not. So I tryied to take the same 
address other SoCs are using (0x01f01468 - CPUS_APB0 register) and 
clearing 1st bit (which is enabled by default) disables R_PIO. So, well, 
it seems that this works the same as on other sunxi SoCs. I'll try doing 
proper change.

Best regards,
Krzysztof Adamski