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SubjectRe: [PATCH v3 7/7] arm64: dts: exynos: Add Exynos850 SoC support
On Tue, 17 Aug 2021 at 21:42, Rob Herring <robh@kernel.org> wrote:
>
> On Wed, Aug 11, 2021 at 02:48:27PM +0300, Sam Protsenko wrote:
> > Samsung Exynos850 is ARMv8-based mobile-oriented SoC.
> >
> > This patch adds minimal SoC support by including next Device Tree nodes:
> >
> > 1. Octa cores (Cortex-A55), supporting PSCI v1.0
> > 2. ARM architecture timer (armv8-timer)
> > 3. Interrupt controller (GIC-400)
> > 4. Pinctrl nodes for GPIO
> > 5. Serial node
> >
> > Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
> > ---
> > Changes in v3:
> > - Used generic fixed clock for serial
> >
> > Changes in v2:
> > * Commit message:
> > - Documented added dts features instead of CPU features
> >
> > * exynos850-usi.dtsi:
> > - Removed, moved everything to exynos850.dtsi
> >
> > * exynos850.dtsi:
> > - Root node:
> > - Added comment about engineering name (Exynos3830)
> > - Renamed pinctrl nodes, adding domain names
> > - Used hard coded IRQ numbers instead of named constants everywhere
> > - Added soc node, moved next nodes there: gic, clock, pinctrls and
> > serial
> > - Used address-cells=1 for soc node and removed unneeded 0x0 from
> > reg properties
> > - Moved exynos850-pinctrl.dtsi include line to the end of
> > exynos850.dtsi
> > - Coding style fixes
> > - cpus:
> > - Used address-cells=1 for cpus node
> > - Renamed cpu@0001 to cpu@1, and so on
> > - Left only "arm,cortex-a55" for cpus compatible
> > - Renamed reg = <0x0001> to <0x1> for cpus
> > - armv8 timer:
> > - Add comment about missing HV timer IRQ to armv8 timer node
> > - Removed not existing properties from armv8 timer node
> > - Fixed cpu number in CPU_MASK()
> > - Removed obsolete clock-frequency property
> > - GIC:
> > - Fixed GIC type to be GIC-400
> > - Fixed size of GIC's 2nd region to be 0x2000
> > - serial node:
> > - Hard coded clock number for serial_0 for now; will replace with
> > named const once proper clock driver is implemented
> > - Removed gate_uart_clk0 clock from serial_0, as that clock is not
> > supported in serial driver anyway (yet)
> > - clock node:
> > - Fixed clock controller node name (@0x12.. -> @12..)
> >
> > * exynos850-pinctrl.dtsi:
> > - Referenced pinctrl nodes instead of defining those again in root node
> > - Fixed interrupt-cells (3 -> 2)
> > - Fixed USI related comments for pin config nodes
> > - Removed decon_f_te_* and fm_lna_en nodes (won't be used)
> > - Reordered pin config nodes by pin numbers
> > - Improved all comments
> > - Used existing named constants for pin-function and pin-pud
> > - Fixed node names (used hyphens instead of underscore)
> > - Fixed warnings found in W=1 build
> >
> > .../boot/dts/exynos/exynos850-pinctrl.dtsi | 748 ++++++++++++++++++
> > arch/arm64/boot/dts/exynos/exynos850.dtsi | 261 ++++++
> > 2 files changed, 1009 insertions(+)
> > create mode 100644 arch/arm64/boot/dts/exynos/exynos850-pinctrl.dtsi
> > create mode 100644 arch/arm64/boot/dts/exynos/exynos850.dtsi
> >
> > diff --git a/arch/arm64/boot/dts/exynos/exynos850-pinctrl.dtsi b/arch/arm64/boot/dts/exynos/exynos850-pinctrl.dtsi
> > new file mode 100644
> > index 000000000000..ba5d5f33e2f6
> > --- /dev/null
> > +++ b/arch/arm64/boot/dts/exynos/exynos850-pinctrl.dtsi
> > @@ -0,0 +1,748 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Samsung's Exynos850 SoC pin-mux and pin-config device tree source
> > + *
> > + * Copyright (C) 2017 Samsung Electronics Co., Ltd.
> > + * Copyright (C) 2021 Linaro Ltd.
> > + *
> > + * Samsung's Exynos850 SoC pin-mux and pin-config options are listed as device
> > + * tree nodes in this file.
> > + */
> > +
> > +#include <dt-bindings/interrupt-controller/arm-gic.h>
> > +#include <dt-bindings/pinctrl/samsung.h>
> > +
> > +&pinctrl_alive {
> > + gpa0: gpa0 {
> > + gpio-controller;
> > + #gpio-cells = <2>;
> > +
> > + interrupt-controller;
> > + #interrupt-cells = <2>;
> > + interrupt-parent = <&gic>;
> > + interrupts = <GIC_SPI 1 IRQ_TYPE_LEVEL_HIGH>,
> > + <GIC_SPI 2 IRQ_TYPE_LEVEL_HIGH>,
> > + <GIC_SPI 3 IRQ_TYPE_LEVEL_HIGH>,
> > + <GIC_SPI 4 IRQ_TYPE_LEVEL_HIGH>,
> > + <GIC_SPI 5 IRQ_TYPE_LEVEL_HIGH>,
> > + <GIC_SPI 6 IRQ_TYPE_LEVEL_HIGH>,
> > + <GIC_SPI 7 IRQ_TYPE_LEVEL_HIGH>,
> > + <GIC_SPI 8 IRQ_TYPE_LEVEL_HIGH>;
> > + };
> > +
> > + gpa1: gpa1 {
> > + gpio-controller;
> > + #gpio-cells = <2>;
> > +
> > + interrupt-controller;
> > + #interrupt-cells = <2>;
> > + interrupt-parent = <&gic>;
> > + interrupts = <GIC_SPI 9 IRQ_TYPE_LEVEL_HIGH>,
> > + <GIC_SPI 10 IRQ_TYPE_LEVEL_HIGH>,
> > + <GIC_SPI 11 IRQ_TYPE_LEVEL_HIGH>,
> > + <GIC_SPI 12 IRQ_TYPE_LEVEL_HIGH>,
> > + <GIC_SPI 13 IRQ_TYPE_LEVEL_HIGH>,
> > + <GIC_SPI 14 IRQ_TYPE_LEVEL_HIGH>,
> > + <GIC_SPI 15 IRQ_TYPE_LEVEL_HIGH>,
> > + <GIC_SPI 16 IRQ_TYPE_LEVEL_HIGH>;
> > + };
> > +
> > + gpa2: gpa2 {
> > + gpio-controller;
> > + #gpio-cells = <2>;
> > +
> > + interrupt-controller;
> > + #interrupt-cells = <2>;
> > + interrupt-parent = <&gic>;
> > + interrupts = <GIC_SPI 17 IRQ_TYPE_LEVEL_HIGH>,
> > + <GIC_SPI 18 IRQ_TYPE_LEVEL_HIGH>,
> > + <GIC_SPI 19 IRQ_TYPE_LEVEL_HIGH>,
> > + <GIC_SPI 20 IRQ_TYPE_LEVEL_HIGH>,
> > + <GIC_SPI 21 IRQ_TYPE_LEVEL_HIGH>,
> > + <GIC_SPI 22 IRQ_TYPE_LEVEL_HIGH>,
> > + <GIC_SPI 23 IRQ_TYPE_LEVEL_HIGH>,
> > + <GIC_SPI 24 IRQ_TYPE_LEVEL_HIGH>;
> > + };
> > +
> > + gpa3: gpa3 {
> > + gpio-controller;
> > + #gpio-cells = <2>;
> > +
> > + interrupt-controller;
> > + #interrupt-cells = <2>;
> > + interrupt-parent = <&gic>;
> > + interrupts = <GIC_SPI 25 IRQ_TYPE_LEVEL_HIGH>,
> > + <GIC_SPI 26 IRQ_TYPE_LEVEL_HIGH>,
> > + <GIC_SPI 27 IRQ_TYPE_LEVEL_HIGH>,
> > + <GIC_SPI 28 IRQ_TYPE_LEVEL_HIGH>,
> > + <GIC_SPI 29 IRQ_TYPE_LEVEL_HIGH>,
> > + <GIC_SPI 30 IRQ_TYPE_LEVEL_HIGH>,
> > + <GIC_SPI 31 IRQ_TYPE_LEVEL_HIGH>,
> > + <GIC_SPI 32 IRQ_TYPE_LEVEL_HIGH>;
> > + };
> > +
> > + gpa4: gpa4 {
> > + gpio-controller;
> > + #gpio-cells = <2>;
> > +
> > + interrupt-controller;
> > + #interrupt-cells = <2>;
> > + interrupt-parent = <&gic>;
> > + interrupts = <GIC_SPI 33 IRQ_TYPE_LEVEL_HIGH>,
> > + <GIC_SPI 34 IRQ_TYPE_LEVEL_HIGH>,
> > + <GIC_SPI 35 IRQ_TYPE_LEVEL_HIGH>,
> > + <GIC_SPI 36 IRQ_TYPE_LEVEL_HIGH>;
> > + };
> > +
> > + gpq0: gpq0 {
> > + gpio-controller;
> > + #gpio-cells = <2>;
> > +
> > + interrupt-controller;
> > + #interrupt-cells = <2>;
> > + };
> > +
> > + /* I2C5 (also called CAM_PMIC_I2C in TRM) */
> > + i2c5_bus: i2c5-bus {
>
> Please name all the pinctrl nodes with some pattern you can match on
> once there is a schema. '-pins$' is my suggestion.
>

Done. This looks much better, the change will be present in new patch
series including board dts.

Can I ask for more info about schema you mentioned: is there some doc
or examples I can check? And is it something generic, or I have to
implement it for Exynos850 dts?

Thanks!

> > + samsung,pins = "gpa3-5", "gpa3-6";
> > + samsung,pin-function = <EXYNOS_PIN_FUNC_3>;
> > + samsung,pin-pud = <EXYNOS_PIN_PULL_UP>;
> > + samsung,pin-drv = <0>;
> > + };
> > +
> > + /* I2C6 (also called MOTOR_I2C in TRM) */
> > + i2c6_bus: i2c6-bus {
> > + samsung,pins = "gpa3-7", "gpa4-0";
> > + samsung,pin-function = <EXYNOS_PIN_FUNC_3>;
> > + samsung,pin-pud = <EXYNOS_PIN_PULL_UP>;
> > + samsung,pin-drv = <0>;
> > + };

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