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Message-ID: <20170127085825.b4mzk47gpczj3dcu@lukather>
Date: Fri, 27 Jan 2017 09:58:25 +0100
From: Maxime Ripard <maxime.ripard@...e-electrons.com>
To: Chen-Yu Tsai <wens@...e.org>
Cc: Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Michael Turquette <mturquette@...libre.com>,
Stephen Boyd <sboyd@...eaurora.org>,
linux-clk <linux-clk@...r.kernel.org>,
linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
devicetree <devicetree@...r.kernel.org>,
linux-kernel <linux-kernel@...r.kernel.org>,
linux-sunxi <linux-sunxi@...glegroups.com>
Subject: Re: [PATCH 07/11] clk: sunxi-ng: Add A80 Display Engine CCU
On Thu, Jan 26, 2017 at 07:20:22PM +0800, Chen-Yu Tsai wrote:
> On Thu, Jan 26, 2017 at 6:39 PM, Maxime Ripard
> <maxime.ripard@...e-electrons.com> wrote:
> > Hi,
> >
> > On Tue, Jan 24, 2017 at 10:32:26AM +0800, Chen-Yu Tsai wrote:
> >> Add support for the display engine clock controls found on the A80.
> >>
> >> Signed-off-by: Chen-Yu Tsai <wens@...e.org>
> >> ---
> >> .../devicetree/bindings/clock/sun9i-de.txt | 28 ++
> >> drivers/clk/sunxi-ng/Makefile | 1 +
> >> drivers/clk/sunxi-ng/ccu-sun9i-a80-de.c | 283 +++++++++++++++++++++
> >> drivers/clk/sunxi-ng/ccu-sun9i-a80-de.h | 33 +++
> >> include/dt-bindings/clock/sun9i-a80-de.h | 80 ++++++
> >> include/dt-bindings/reset/sun9i-a80-de.h | 58 +++++
> >> 6 files changed, 483 insertions(+)
> >> create mode 100644 Documentation/devicetree/bindings/clock/sun9i-de.txt
> >> create mode 100644 drivers/clk/sunxi-ng/ccu-sun9i-a80-de.c
> >> create mode 100644 drivers/clk/sunxi-ng/ccu-sun9i-a80-de.h
> >> create mode 100644 include/dt-bindings/clock/sun9i-a80-de.h
> >> create mode 100644 include/dt-bindings/reset/sun9i-a80-de.h
> >>
> >> diff --git a/Documentation/devicetree/bindings/clock/sun9i-de.txt b/Documentation/devicetree/bindings/clock/sun9i-de.txt
> >> new file mode 100644
> >> index 000000000000..3a5e6df70677
> >> --- /dev/null
> >> +++ b/Documentation/devicetree/bindings/clock/sun9i-de.txt
> >> @@ -0,0 +1,28 @@
> >> +Allwinner A80 Display Engine Clock Control Binding
> >> +------------------------------------
> >> +
> >> +Required properties :
> >> +- compatible: must contain one of the following compatibles:
> >> + - "allwinner,sun9i-a80-de-clocks"
> >> +
> >> +- reg: Must contain the registers base address and length
> >> +- clocks: phandle to the clocks feeding the display engine subsystem.
> >> + Three are needed:
> >> + - "mod": the display engine module clock
> >> + - "dram": the DRAM bus clock for the system
> >> + - "bus": the bus clock for the whole display engine subsystem
> >> +- clock-names: Must contain the clock names described just above
> >> +- resets: phandle to the reset control for the display engine subsystem.
> >> +- #clock-cells : must contain 1
> >> +- #reset-cells : must contain 1
> >> +
> >> +Example:
> >> +de_clocks: clock@...00000 {
> >> + compatible = "allwinner,sun9i-a80-de-clks";
> >> + reg = <0x03000000 0x30>;
> >> + clocks = <&ccu CLK_DE>, <&ccu CLK_SDRAM>, <&ccu CLK_BUS_DE>;
> >> + clock-names = "mod", "dram", "bus";
> >> + resets = <&ccu RST_BUS_DE>;
> >> + #clock-cells = <1>;
> >> + #reset-cells = <1>;
> >> +};
> >> diff --git a/drivers/clk/sunxi-ng/Makefile b/drivers/clk/sunxi-ng/Makefile
> >> index 8f37ef7fb67d..6feaac0c5600 100644
> >> --- a/drivers/clk/sunxi-ng/Makefile
> >> +++ b/drivers/clk/sunxi-ng/Makefile
> >> @@ -26,4 +26,5 @@ obj-$(CONFIG_SUN8I_A33_CCU) += ccu-sun8i-a33.o
> >> obj-$(CONFIG_SUN8I_H3_CCU) += ccu-sun8i-h3.o
> >> obj-$(CONFIG_SUN8I_V3S_CCU) += ccu-sun8i-v3s.o
> >> obj-$(CONFIG_SUN9I_A80_CCU) += ccu-sun9i-a80.o
> >> +obj-$(CONFIG_SUN9I_A80_CCU) += ccu-sun9i-a80-de.o
> >> obj-$(CONFIG_SUN9I_A80_CCU) += ccu-sun9i-a80-usb.o
> >> diff --git a/drivers/clk/sunxi-ng/ccu-sun9i-a80-de.c b/drivers/clk/sunxi-ng/ccu-sun9i-a80-de.c
> >> new file mode 100644
> >> index 000000000000..3fc27db0a49a
> >> --- /dev/null
> >> +++ b/drivers/clk/sunxi-ng/ccu-sun9i-a80-de.c
> >> @@ -0,0 +1,283 @@
> >> +/*
> >> + * Copyright (c) 2016 Chen-Yu Tsai. All rights reserved.
> >> + *
> >> + * This software is licensed under the terms of the GNU General Public
> >> + * License version 2, as published by the Free Software Foundation, and
> >> + * may be copied, distributed, and modified under those terms.
> >> + *
> >> + * This program is distributed in the hope that it will be useful,
> >> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> >> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> >> + * GNU General Public License for more details.
> >> + */
> >> +
> >> +#include <linux/clk.h>
> >> +#include <linux/clk-provider.h>
> >> +#include <linux/of_address.h>
> >> +#include <linux/platform_device.h>
> >> +#include <linux/reset.h>
> >> +
> >> +#include "ccu_common.h"
> >> +#include "ccu_div.h"
> >> +#include "ccu_gate.h"
> >> +#include "ccu_reset.h"
> >> +
> >> +#include "ccu-sun9i-a80-de.h"
> >> +
> >> +static SUNXI_CCU_GATE(fe0_clk, "fe0", "fe0-div",
> >> + 0x00, BIT(0), 0);
> >> +static SUNXI_CCU_GATE(fe1_clk, "fe1", "fe1-div",
> >> + 0x00, BIT(1), 0);
> >> +static SUNXI_CCU_GATE(fe2_clk, "fe2", "fe2-div",
> >> + 0x00, BIT(2), 0);
> >> +static SUNXI_CCU_GATE(iep_deu0_clk, "iep-deu0", "de",
> >> + 0x00, BIT(4), 0);
> >> +static SUNXI_CCU_GATE(iep_deu1_clk, "iep-deu1", "de",
> >> + 0x00, BIT(5), 0);
> >> +static SUNXI_CCU_GATE(be0_clk, "be0", "be0-div",
> >> + 0x00, BIT(8), 0);
> >> +static SUNXI_CCU_GATE(be1_clk, "be1", "be1-div",
> >> + 0x00, BIT(9), 0);
> >> +static SUNXI_CCU_GATE(be2_clk, "be2", "be2-div",
> >> + 0x00, BIT(10), 0);
> >> +static SUNXI_CCU_GATE(iep_drc0_clk, "iep-drc0", "de",
> >> + 0x00, BIT(12), 0);
> >> +static SUNXI_CCU_GATE(iep_drc1_clk, "iep-drc1", "de",
> >> + 0x00, BIT(13), 0);
> >> +static SUNXI_CCU_GATE(merge_clk, "merge", "de",
> >> + 0x00, BIT(20), 0);
> >> +
> >> +static SUNXI_CCU_GATE(dram_fe0_clk, "dram-fe0", "sdram",
> >> + 0x04, BIT(0), 0);
> >> +static SUNXI_CCU_GATE(dram_fe1_clk, "dram-fe1", "sdram",
> >> + 0x04, BIT(1), 0);
> >> +static SUNXI_CCU_GATE(dram_fe2_clk, "dram-fe2", "sdram",
> >> + 0x04, BIT(2), 0);
> >> +static SUNXI_CCU_GATE(dram_deu0_clk, "dram-deu0", "sdram",
> >> + 0x04, BIT(4), 0);
> >> +static SUNXI_CCU_GATE(dram_deu1_clk, "dram-deu1", "sdram",
> >> + 0x04, BIT(5), 0);
> >> +static SUNXI_CCU_GATE(dram_be0_clk, "dram-be0", "sdram",
> >> + 0x04, BIT(8), 0);
> >> +static SUNXI_CCU_GATE(dram_be1_clk, "dram-be1", "sdram",
> >> + 0x04, BIT(9), 0);
> >> +static SUNXI_CCU_GATE(dram_be2_clk, "dram-be2", "sdram",
> >> + 0x04, BIT(10), 0);
> >> +static SUNXI_CCU_GATE(dram_drc0_clk, "dram-drc0", "sdram",
> >> + 0x04, BIT(12), 0);
> >> +static SUNXI_CCU_GATE(dram_drc1_clk, "dram-drc1", "sdram",
> >> + 0x04, BIT(13), 0);
> >> +
> >> +static SUNXI_CCU_GATE(bus_fe0_clk, "bus-fe0", "bus-de",
> >> + 0x08, BIT(0), 0);
> >> +static SUNXI_CCU_GATE(bus_fe1_clk, "bus-fe1", "bus-de",
> >> + 0x08, BIT(1), 0);
> >> +static SUNXI_CCU_GATE(bus_fe2_clk, "bus-fe2", "bus-de",
> >> + 0x08, BIT(2), 0);
> >> +static SUNXI_CCU_GATE(bus_deu0_clk, "bus-deu0", "bus-de",
> >> + 0x08, BIT(4), 0);
> >> +static SUNXI_CCU_GATE(bus_deu1_clk, "bus-deu1", "bus-de",
> >> + 0x08, BIT(5), 0);
> >> +static SUNXI_CCU_GATE(bus_be0_clk, "bus-be0", "bus-de",
> >> + 0x08, BIT(8), 0);
> >> +static SUNXI_CCU_GATE(bus_be1_clk, "bus-be1", "bus-de",
> >> + 0x08, BIT(9), 0);
> >> +static SUNXI_CCU_GATE(bus_be2_clk, "bus-be2", "bus-de",
> >> + 0x08, BIT(10), 0);
> >> +static SUNXI_CCU_GATE(bus_drc0_clk, "bus-drc0", "bus-de",
> >> + 0x08, BIT(12), 0);
> >> +static SUNXI_CCU_GATE(bus_drc1_clk, "bus-drc1", "bus-de",
> >> + 0x08, BIT(13), 0);
> >> +
> >> +static SUNXI_CCU_M(fe0_div_clk, "fe0-div", "de", 0x20, 0, 4, 0);
> >> +static SUNXI_CCU_M(fe1_div_clk, "fe1-div", "de", 0x20, 4, 4, 0);
> >> +static SUNXI_CCU_M(fe2_div_clk, "fe2-div", "de", 0x20, 8, 4, 0);
> >> +static SUNXI_CCU_M(be0_div_clk, "be0-div", "de", 0x20, 16, 4, 0);
> >> +static SUNXI_CCU_M(be1_div_clk, "be1-div", "de", 0x20, 20, 4, 0);
> >> +static SUNXI_CCU_M(be2_div_clk, "be2-div", "de", 0x20, 24, 4, 0);
> >
> > I couldn't find any documentation for this CCU.
>
> I dug this up in the released Allwinner kernel.
>
> > What are those clocks for, and how the display engine should be using
> > (ie, which one is it expecting to drive / ungate / etc.)
>
> Allwinner basically put all DE-related clock controls into a
> separate module. In here, as the names above suggest, we have
> bus gates, dram gates, and module clocks for each part of the
> display pipeline. As with older SoCs that have DE 1.0, each
> module should ungate and use the clocks related to them.
>
> I'll put something like the above in the commit message.
So the module clocks are a combination of a divider and a clock?
And I'm guessing the reason you separated them is because they belong
in a different register.
Maxime
--
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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