Re: [PATCH v3 1/3] dt-bindings: pinctrl: renesas,rzn1-pinctrl: documentation

From: jacopo mondi
Date: Tue Sep 18 2018 - 06:48:15 EST

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In reply to: Phil Edworthy: "RE: [PATCH v3 1/3] dt-bindings: pinctrl: renesas,rzn1-pinctrl: documentation"
Next in thread: Phil Edworthy: "[PATCH v3 2/3] pinctrl: renesas: Renesas RZ/N1 pinctrl driver"
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Hi Phil,

On Tue, Sep 18, 2018 at 09:44:40AM +0000, Phil Edworthy wrote:
> Hi Jacopo,
>
> On 18 September 2018 10:27 jacopo mondi wrote:
> > Hi Phil,
> > thanks for the update. This looks much better :)
> >
> > On Mon, Sep 17, 2018 at 05:36:07PM +0100, Phil Edworthy wrote:
> > > The Renesas RZ/N1 device family PINCTRL node description.
> > >
> > > Based on a patch originally written by Michel Pollet at Renesas.
> > >
> > > Signed-off-by: Phil Edworthy <phil.edworthy@xxxxxxxxxxx>
> > > ---
> > > v3:
> > > - Use standard bindings
> > > - Change the way the functions are defined so it is easy to check
> > > against the hardware numbering.
> > > - Add functions for the MDIO source peripheral instead of using
> > > virtual pins.
> > >
> > > v2:
> > > - Change filename to generic rzn1, instead of device specific.
> > > - Add "renesas,rzn1-pinctrl" compatible fallback string.
> > > - Example register size corrected.
> > > - Typos fixed.
> > > - Changes suggested by Jacopo Mondi.
> > > - rzn1-pinctrl.h squashed into this as requested by Rob Herring.
> > > ---
> > > .../bindings/pinctrl/renesas,rzn1-pinctrl.txt | 129 ++++++++++++++++
> > > include/dt-bindings/pinctrl/rzn1-pinctrl.h | 141 ++++++++++++++++++
> > > 2 files changed, 270 insertions(+)
> > > create mode 100644
> > > Documentation/devicetree/bindings/pinctrl/renesas,rzn1-pinctrl.txt
> > > create mode 100644 include/dt-bindings/pinctrl/rzn1-pinctrl.h
> > >
> > > diff --git
> > > a/Documentation/devicetree/bindings/pinctrl/renesas,rzn1-pinctrl.txt
> > > b/Documentation/devicetree/bindings/pinctrl/renesas,rzn1-pinctrl.txt
> > > new file mode 100644
> > > index 000000000000..203131ed8d2a
> > > --- /dev/null
> > > +++ b/Documentation/devicetree/bindings/pinctrl/renesas,rzn1-pinctrl.t
> > > +++ xt
> > > @@ -0,0 +1,129 @@
> > > +Renesas RZ/N1 SoC Pinctrl node description.
> > > +
> > > +Pin controller node
> > > +-------------------
> > > +Required properties:
> > > +- compatible: SoC-specific compatible string "renesas,<soc-specific>-
> > pinctrl"
> > > + followed by "renesas,rzn1-pinctrl" as fallback. The SoC-specific
> > > +compatible
> > > + strings must be one of:
> > > + "renesas,r9a06g032-pinctrl" for RZ/N1D
> > > + "renesas,r9a06g033-pinctrl" for RZ/N1S
> > > +- reg: Address base and length of the memory area where the pin
> > > +controller
> > > + hardware is mapped to.
> > > +- clocks: phandles for the clock, see the description of clock-names below.
> > > +- clock-names: Contains the name of the clock:
> > > + "bus", the bus clock, sometimes described as pclk, for register accesses.
> >
> > If that's the only clock, the clock name is optional. If you drop it, then please
> > mention that the only phandle in 'clocks' refers to the "bus" clock.
> The driver currently specifies the "bus" name when calling devm_clk_get(), so
> you need the clock-names.

well, you need them, because the driver implementation requries that,
and you implemented it that way :) I won't argue on something this
stupid though, what you have here is fine

> If other changes are required, I will change the driver and update the binding
> doc so they are not needed.
>
> > > +
> > > +Example:
> > > + pinctrl: pin-controller@40067000 {
> > > + compatible = "renesas,r9a06g032-pinctrl", "renesas,rzn1-pinctrl";
> > > + reg = <0x40067000 0x1000>, <0x51000000 0x480>;
> > > + clocks = <&sysctrl R9A06G032_HCLK_PINCONFIG>;
> > > + clock-names = "bus";
> > > + };
> > > +
> > > +Sub-nodes
> > > +---------
> > > +
> > > +The child nodes of the pin controller node describe a pin
> > > +multiplexing function or a GPIO controller alternatively.

You have no gpio-controller support, so no GPIO configuration
sub-nodes.

> > > +
> > > +- Pin multiplexing sub-nodes:
> > > + A pin multiplexing sub-node describes how to configure a set of
> > > + (or a single) pin in some desired alternate function mode.
> > > + A single sub-node may define several pin configurations.
> > > + Please refer to pinctrl-bindings.txt to get to know more on generic
> > > + pin properties usage.
> > > +
> > > + The allowed generic formats for a pin multiplexing sub-node are the
> > > + following ones:
> > > +
> > > + node-1 {
> > > + pinmux = <PIN_ID_AND_MUX>, <PIN_ID_AND_MUX>, ... ;
> > > + GENERIC_PINCONFIG;
> > > + };
> > > +
> > > + node-2 {
> > > + sub-node-1 {
> > > + pinmux = <PIN_ID_AND_MUX>, <PIN_ID_AND_MUX>, ... ;
> > > + GENERIC_PINCONFIG;
> > > + };
> > > +
> > > + sub-node-2 {
> > > + pinmux = <PIN_ID_AND_MUX>, <PIN_ID_AND_MUX>, ... ;
> > > + GENERIC_PINCONFIG;
> > > + };
> > > +
> > > + ...
> > > +
> > > + sub-node-n {
> > > + pinmux = <PIN_ID_AND_MUX>, <PIN_ID_AND_MUX>, ... ;
> > > + GENERIC_PINCONFIG;
> > > + };
> > > + };
> > > +
> > > + Use the second format when pins part of the same logical group need
> > > + to have different generic pin configuration flags applied.
> > > +
> > > + Client sub-nodes shall refer to pin multiplexing sub-nodes using
> > > + the phandle of the most external one.
> > > +
> > > + Eg.
> > > +
> > > + client-1 {
> > > + ...
> > > + pinctrl-0 = <&node-1>;
> > > + ...
> > > + };
> > > +
> > > + client-2 {
> > > + ...
> > > + pinctrl-0 = <&node-2>;
> > > + ...
> > > + };
> > > +
> > > + Required properties:
> > > + - pinmux:
> > > + integer array representing pin number and pin multiplexing
> > configuration.
> > > + When a pin has to be configured in alternate function mode, use this
> > > + property to identify the pin by its global index, and provide its
> > > + alternate function configuration number along with it.
> > > + When multiple pins are required to be configured as part of the same
> > > + alternate function they shall be specified as members of the same
> > > + argument list of a single "pinmux" property.
> > > + Integers values in the "pinmux" argument list are assembled as:
> > > + (PIN | MUX_FUNC << 8)
> > > + where PIN directly corresponds to the pl_gpio pin number and
> > MUX_FUNC is
> > > + one of the alternate function identifiers defined in:
> > > + <include/dt-bindings/pinctrl/rzn1-pinctrl.h>
> >
> > You have a macro for assembling pin and mux functions, do you think it is
> > worth mentioning it here?
> Not sure itâs worth it, it's used in the examples anyway.
>
> > > + These identifiers collapse the IO Multiplex Configuration Level 1 and
> > > + Level 2 numbers that are detailed in the hardware reference manual
> > into a
> > > + single number. The identifiers for Level 2 are simply offset by 10.
> > > + Additional identifiers are provided to specify the MDIO source
> > peripheral.
> >
> > As we discussed offline, I don't see that much value in mentioning details
> > about the pinmuxing levels, as this is driver internal stuff that reflects on
> > which set of registers to use depending on the muxing 'level'. I understand
> > though that as the SoC manual mentions levels, you may want to refer to
> > them. Up to you....
> I'll leave it as is unless there are other comments.
>

I do, actually, after reviewing the driver too.
1) You should list which generic properties this peripheral supports.
2) The tiny GPIO controller thing mentioned above.

Thanks
j

> > > +
> > > + Example:
> > > + A serial communication interface with a TX output pin and an RX input
> > pin.
> > > +
> > > + &pinctrl {
> > > + pins_uart0: pins_uart0 {
> > > + pinmux = <
> > > + RZN1_MUX(103, UART0_I) /* UART0_TXD */
> > > + RZN1_MUX(104, UART0_I) /* UART0_RXD */
> > > + >;
> > > + };
> > > + };
> > > +
> > > + Example 2:
> > > + Here we set the pull up on the RXD pin of the UART.
> > > +
> > > + &pinctrl {
> > > + pins_uart0: pins_uart0 {
> > > + pins_uart6_tx {
> > > + pinmux = <RZN1_MUX(103, UART0_I)>; /*
> > UART0_TXD */
> > > + };
> > > + pins_uart6_rx {
> > > + pinmux = <RZN1_MUX(104, UART0_I)>; /*
> > UART0_RXD */
> > > + bias-pull-up;
> > > + };
> > > + };
> > > + };
> >
> > I like this version much more. With those minor issues clarified (up to you to
> > decide how to handle them) please add my:
> > Reviewed-by: Jacopo Mondi <jacopo+renesas@xxxxxxxxxx>
>
> Many thanks for your review!
> Phil
>
>
> > Cheers
> > j
> >
> >
> > > diff --git a/include/dt-bindings/pinctrl/rzn1-pinctrl.h
> > > b/include/dt-bindings/pinctrl/rzn1-pinctrl.h
> > > new file mode 100644
> > > index 000000000000..40369ee36e6a
> > > --- /dev/null
> > > +++ b/include/dt-bindings/pinctrl/rzn1-pinctrl.h
> > > @@ -0,0 +1,141 @@
> > > +/* SPDX-License-Identifier: GPL-2.0 */
> > > +/*
> > > + * Defines macros and constants for Renesas RZ/N1 pin controller pin
> > > + * muxing functions.
> > > + */
> > > +#ifndef __DT_BINDINGS_RZN1_PINCTRL_H
> > > +#define __DT_BINDINGS_RZN1_PINCTRL_H
> > > +
> > > +#define RZN1_MUX(_gpio, _func) \
> > > + (((RZN1_FUNC_##_func) << 8) | (_gpio))
> > > +
> > > +/*
> > > + * Given the different levels of muxing on the SoC, it was decided to
> > > + * 'linearize' them into one numerical space. So mux level 1, 2 and
> > > +the MDIO
> > > + * muxes are all represented by one single value.
> > > + *
> > > + * You can derive the hardware value pretty easily too, as
> > > + * 0...9 are Level 1
> > > + * 10...71 are Level 2. The Level 2 mux will be set to this
> > > + * value - RZN1_FUNC_L2_OFFSET, and the Level 1 mux will be
> > > + * set accordingly.
> > > + * 72...103 are for the 2 MDIO muxes.
> > > + */
> > > +#define RZN1_FUNC_HIGHZ 0
> > > +#define RZN1_FUNC_0L 1
> > > +#define RZN1_FUNC_CLK_ETH_MII_RGMII_RMII 2
> > > +#define RZN1_FUNC_CLK_ETH_NAND 3
> > > +#define RZN1_FUNC_QSPI 4
> > > +#define RZN1_FUNC_SDIO 5
> > > +#define RZN1_FUNC_LCD 6
> > > +#define RZN1_FUNC_LCD_E 7
> > > +#define RZN1_FUNC_MSEBIM 8
> > > +#define RZN1_FUNC_MSEBIS 9
> > > +#define RZN1_FUNC_L2_OFFSET 10 /* I'm Special
> > */
> > > +
> > > +#define RZN1_FUNC_HIGHZ1
> > (RZN1_FUNC_L2_OFFSET + 0)
> > > +#define RZN1_FUNC_ETHERCAT
> > (RZN1_FUNC_L2_OFFSET + 1)
> > > +#define RZN1_FUNC_SERCOS3
> > (RZN1_FUNC_L2_OFFSET + 2)
> > > +#define RZN1_FUNC_SDIO_E
> > (RZN1_FUNC_L2_OFFSET + 3)
> > > +#define RZN1_FUNC_ETH_MDIO
> > (RZN1_FUNC_L2_OFFSET + 4)
> > > +#define RZN1_FUNC_ETH_MDIO_E1
> > (RZN1_FUNC_L2_OFFSET + 5)
> > > +#define RZN1_FUNC_USB
> > (RZN1_FUNC_L2_OFFSET + 6)
> > > +#define RZN1_FUNC_MSEBIM_E
> > (RZN1_FUNC_L2_OFFSET + 7)
> > > +#define RZN1_FUNC_MSEBIS_E
> > (RZN1_FUNC_L2_OFFSET + 8)
> > > +#define RZN1_FUNC_RSV
> > (RZN1_FUNC_L2_OFFSET + 9)
> > > +#define RZN1_FUNC_RSV_E
> > (RZN1_FUNC_L2_OFFSET + 10)
> > > +#define RZN1_FUNC_RSV_E1
> > (RZN1_FUNC_L2_OFFSET + 11)
> > > +#define RZN1_FUNC_UART0_I
> > (RZN1_FUNC_L2_OFFSET + 12)
> > > +#define RZN1_FUNC_UART0_I_E
> > (RZN1_FUNC_L2_OFFSET + 13)
> > > +#define RZN1_FUNC_UART1_I
> > (RZN1_FUNC_L2_OFFSET + 14)
> > > +#define RZN1_FUNC_UART1_I_E
> > (RZN1_FUNC_L2_OFFSET + 15)
> > > +#define RZN1_FUNC_UART2_I
> > (RZN1_FUNC_L2_OFFSET + 16)
> > > +#define RZN1_FUNC_UART2_I_E
> > (RZN1_FUNC_L2_OFFSET + 17)
> > > +#define RZN1_FUNC_UART0
> > (RZN1_FUNC_L2_OFFSET + 18)
> > > +#define RZN1_FUNC_UART0_E
> > (RZN1_FUNC_L2_OFFSET + 19)
> > > +#define RZN1_FUNC_UART1
> > (RZN1_FUNC_L2_OFFSET + 20)
> > > +#define RZN1_FUNC_UART1_E
> > (RZN1_FUNC_L2_OFFSET + 21)
> > > +#define RZN1_FUNC_UART2
> > (RZN1_FUNC_L2_OFFSET + 22)
> > > +#define RZN1_FUNC_UART2_E
> > (RZN1_FUNC_L2_OFFSET + 23)
> > > +#define RZN1_FUNC_UART3
> > (RZN1_FUNC_L2_OFFSET + 24)
> > > +#define RZN1_FUNC_UART3_E
> > (RZN1_FUNC_L2_OFFSET + 25)
> > > +#define RZN1_FUNC_UART4
> > (RZN1_FUNC_L2_OFFSET + 26)
> > > +#define RZN1_FUNC_UART4_E
> > (RZN1_FUNC_L2_OFFSET + 27)
> > > +#define RZN1_FUNC_UART5
> > (RZN1_FUNC_L2_OFFSET + 28)
> > > +#define RZN1_FUNC_UART5_E
> > (RZN1_FUNC_L2_OFFSET + 29)
> > > +#define RZN1_FUNC_UART6
> > (RZN1_FUNC_L2_OFFSET + 30)
> > > +#define RZN1_FUNC_UART6_E
> > (RZN1_FUNC_L2_OFFSET + 31)
> > > +#define RZN1_FUNC_UART7
> > (RZN1_FUNC_L2_OFFSET + 32)
> > > +#define RZN1_FUNC_UART7_E
> > (RZN1_FUNC_L2_OFFSET + 33)
> > > +#define RZN1_FUNC_SPI0_M
> > (RZN1_FUNC_L2_OFFSET + 34)
> > > +#define RZN1_FUNC_SPI0_M_E
> > (RZN1_FUNC_L2_OFFSET + 35)
> > > +#define RZN1_FUNC_SPI1_M
> > (RZN1_FUNC_L2_OFFSET + 36)
> > > +#define RZN1_FUNC_SPI1_M_E
> > (RZN1_FUNC_L2_OFFSET + 37)
> > > +#define RZN1_FUNC_SPI2_M
> > (RZN1_FUNC_L2_OFFSET + 38)
> > > +#define RZN1_FUNC_SPI2_M_E
> > (RZN1_FUNC_L2_OFFSET + 39)
> > > +#define RZN1_FUNC_SPI3_M
> > (RZN1_FUNC_L2_OFFSET + 40)
> > > +#define RZN1_FUNC_SPI3_M_E
> > (RZN1_FUNC_L2_OFFSET + 41)
> > > +#define RZN1_FUNC_SPI4_S
> > (RZN1_FUNC_L2_OFFSET + 42)
> > > +#define RZN1_FUNC_SPI4_S_E
> > (RZN1_FUNC_L2_OFFSET + 43)
> > > +#define RZN1_FUNC_SPI5_S
> > (RZN1_FUNC_L2_OFFSET + 44)
> > > +#define RZN1_FUNC_SPI5_S_E
> > (RZN1_FUNC_L2_OFFSET + 45)
> > > +#define RZN1_FUNC_SGPIO0_M
> > (RZN1_FUNC_L2_OFFSET + 46)
> > > +#define RZN1_FUNC_SGPIO1_M
> > (RZN1_FUNC_L2_OFFSET + 47)
> > > +#define RZN1_FUNC_GPIO
> > (RZN1_FUNC_L2_OFFSET + 48)
> > > +#define RZN1_FUNC_CAN
> > (RZN1_FUNC_L2_OFFSET + 49)
> > > +#define RZN1_FUNC_I2C
> > (RZN1_FUNC_L2_OFFSET + 50)
> > > +#define RZN1_FUNC_SAFE
> > (RZN1_FUNC_L2_OFFSET + 51)
> > > +#define RZN1_FUNC_PTO_PWM
> > (RZN1_FUNC_L2_OFFSET + 52)
> > > +#define RZN1_FUNC_PTO_PWM1
> > (RZN1_FUNC_L2_OFFSET + 53)
> > > +#define RZN1_FUNC_PTO_PWM2
> > (RZN1_FUNC_L2_OFFSET + 54)
> > > +#define RZN1_FUNC_PTO_PWM3
> > (RZN1_FUNC_L2_OFFSET + 55)
> > > +#define RZN1_FUNC_PTO_PWM4
> > (RZN1_FUNC_L2_OFFSET + 56)
> > > +#define RZN1_FUNC_DELTA_SIGMA
> > (RZN1_FUNC_L2_OFFSET + 57)
> > > +#define RZN1_FUNC_SGPIO2_M
> > (RZN1_FUNC_L2_OFFSET + 58)
> > > +#define RZN1_FUNC_SGPIO3_M
> > (RZN1_FUNC_L2_OFFSET + 59)
> > > +#define RZN1_FUNC_SGPIO4_S
> > (RZN1_FUNC_L2_OFFSET + 60)
> > > +#define RZN1_FUNC_MAC_MTIP_SWITCH
> > (RZN1_FUNC_L2_OFFSET + 61)
> > > +
> > > +#define RZN1_FUNC_MDIO_OFFSET
> > (RZN1_FUNC_L2_OFFSET + 62)
> > > +
> > > +/* These are MDIO0 peripherals for the RZN1_FUNC_ETH_MDIO function
> > */
> > > +#define RZN1_FUNC_MDIO0_HIGHZ
> > (RZN1_FUNC_MDIO_OFFSET + 0)
> > > +#define RZN1_FUNC_MDIO0_GMAC0
> > (RZN1_FUNC_MDIO_OFFSET + 1)
> > > +#define RZN1_FUNC_MDIO0_GMAC1
> > (RZN1_FUNC_MDIO_OFFSET + 2)
> > > +#define RZN1_FUNC_MDIO0_ECAT
> > (RZN1_FUNC_MDIO_OFFSET + 3)
> > > +#define RZN1_FUNC_MDIO0_S3_MDIO0
> > (RZN1_FUNC_MDIO_OFFSET + 4)
> > > +#define RZN1_FUNC_MDIO0_S3_MDIO1
> > (RZN1_FUNC_MDIO_OFFSET + 5)
> > > +#define RZN1_FUNC_MDIO0_HWRTOS
> > (RZN1_FUNC_MDIO_OFFSET + 6)
> > > +#define RZN1_FUNC_MDIO0_SWITCH
> > (RZN1_FUNC_MDIO_OFFSET + 7)
> > > +/* These are MDIO0 peripherals for the RZN1_FUNC_ETH_MDIO_E1
> > function */
> > > +#define RZN1_FUNC_MDIO0_E1_HIGHZ
> > (RZN1_FUNC_MDIO_OFFSET + 8)
> > > +#define RZN1_FUNC_MDIO0_E1_GMAC0
> > (RZN1_FUNC_MDIO_OFFSET + 9)
> > > +#define RZN1_FUNC_MDIO0_E1_GMAC1
> > (RZN1_FUNC_MDIO_OFFSET + 10)
> > > +#define RZN1_FUNC_MDIO0_E1_ECAT
> > (RZN1_FUNC_MDIO_OFFSET + 11)
> > > +#define RZN1_FUNC_MDIO0_E1_S3_MDIO0
> > (RZN1_FUNC_MDIO_OFFSET + 12)
> > > +#define RZN1_FUNC_MDIO0_E1_S3_MDIO1
> > (RZN1_FUNC_MDIO_OFFSET + 13)
> > > +#define RZN1_FUNC_MDIO0_E1_HWRTOS
> > (RZN1_FUNC_MDIO_OFFSET + 14)
> > > +#define RZN1_FUNC_MDIO0_E1_SWITCH
> > (RZN1_FUNC_MDIO_OFFSET + 15)
> > > +
> > > +/* These are MDIO1 peripherals for the RZN1_FUNC_ETH_MDIO function
> > */
> > > +#define RZN1_FUNC_MDIO1_HIGHZ
> > (RZN1_FUNC_MDIO_OFFSET + 16)
> > > +#define RZN1_FUNC_MDIO1_GMAC0
> > (RZN1_FUNC_MDIO_OFFSET + 17)
> > > +#define RZN1_FUNC_MDIO1_GMAC1
> > (RZN1_FUNC_MDIO_OFFSET + 18)
> > > +#define RZN1_FUNC_MDIO1_ECAT
> > (RZN1_FUNC_MDIO_OFFSET + 19)
> > > +#define RZN1_FUNC_MDIO1_S3_MDIO0
> > (RZN1_FUNC_MDIO_OFFSET + 20)
> > > +#define RZN1_FUNC_MDIO1_S3_MDIO1
> > (RZN1_FUNC_MDIO_OFFSET + 21)
> > > +#define RZN1_FUNC_MDIO1_HWRTOS
> > (RZN1_FUNC_MDIO_OFFSET + 22)
> > > +#define RZN1_FUNC_MDIO1_SWITCH
> > (RZN1_FUNC_MDIO_OFFSET + 23)
> > > +/* These are MDIO1 peripherals for the RZN1_FUNC_ETH_MDIO_E1
> > function */
> > > +#define RZN1_FUNC_MDIO1_E1_HIGHZ
> > (RZN1_FUNC_MDIO_OFFSET + 24)
> > > +#define RZN1_FUNC_MDIO1_E1_GMAC0
> > (RZN1_FUNC_MDIO_OFFSET + 25)
> > > +#define RZN1_FUNC_MDIO1_E1_GMAC1
> > (RZN1_FUNC_MDIO_OFFSET + 26)
> > > +#define RZN1_FUNC_MDIO1_E1_ECAT
> > (RZN1_FUNC_MDIO_OFFSET + 27)
> > > +#define RZN1_FUNC_MDIO1_E1_S3_MDIO0
> > (RZN1_FUNC_MDIO_OFFSET + 28)
> > > +#define RZN1_FUNC_MDIO1_E1_S3_MDIO1
> > (RZN1_FUNC_MDIO_OFFSET + 29)
> > > +#define RZN1_FUNC_MDIO1_E1_HWRTOS
> > (RZN1_FUNC_MDIO_OFFSET + 30)
> > > +#define RZN1_FUNC_MDIO1_E1_SWITCH
> > (RZN1_FUNC_MDIO_OFFSET + 31)
> > > +
> > > +#define RZN1_FUNC_MAX
> > (RZN1_FUNC_MDIO_OFFSET + 32)
> > > +
> > > +#endif /* __DT_BINDINGS_RZN1_PINCTRL_H */
> > > --
> > > 2.17.1
> > >

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