[PATCH 00/25] serial: sh-sci: Add external clock and BRG Support

From	Geert Uytterhoeven <geert+renesas@glider.be>
Newsgroups	linux.kernel
Subject	[PATCH 00/25] serial: sh-sci: Add external clock and BRG Support
Date	2015-11-19 19:50 +0100
Message-ID	<qwChI-4Cb-7@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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	Hi,

This patch series adds support to the Renesas SCI serial driver for
  - the optional external clock on (H)SCI(F) and some SCIFA, where this
    pin can serve as a clock input,
  - the optional clock sources for the Baud Rate Generator for External
    Clock (BRG), as found on some SCIF variants and on HSCIF.
Using external clocks increases the range and accuracy of supported baud
rates. Please see the descriptions of the DTS patches for more detailed
information regarding the impact on the supported platforms.

For now this supports r8a7791/koelsch and r8a7795/salvator-x only, which
have an external SCIF_CLK running at 14.7456 MHz.
Support for other R-Car platforms will be added later.

Testing:
  - The Baud Rate Generator for External Clock (BRG) was tested with
    SCIF and HSCIF on r8a7791/koelsch and r8a7795/salvator-x,
  - The external clock input on (H)SCK was tested on r8a7795/salvator-x
    by feeding an external clock signal to (H)SCIF1,
  - Various bit rates were monitored using a SmartScope,
  - Regression testing was done on Renesas ARM platforms that use SCIFA
    as the console (r8a73a4/ape6evm, r8a7740/armadillo, and
    sh73a0/kzm9g).
	      
Dependencies:
  - This series depends on the series "[PATCH v2 00/16] serial: sh-sci:
    Clock Cleanups",
  - The SH patch 25 depends on the "serial: sh-sci" patches in this
    series,
  - The DTS patches 21-24 can be applied independently, once the DT
    binding patches 1-2 are accepted,
  - r8a7791/r8a7795 has a runtime dependency on series "[PATCH 0/2]
    pinctrl: sh-pfc: r8a7791/r8a7795: Add SCIF_CLK support",
  - r8a7795 also depends on
       - platform support in e.g. renesas-drivers-2015-11-17-v4.4-rc1,
       - "[PATCH] pinctrl: sh-pfc: r8a7795: Add HSCIF pins, groups, and
	 functions",
       - "[PATCH] arm64: renesas: r8a7795 dtsi: Add all HSCIF nodes".
  - Legacy SH has a runtime dependency on:
      - series "[PATCH 0/2] drivers: sh: clk: Cleanup clock API",

Thanks for your comments!

Geert Uytterhoeven (25):
  serial: sh-sci: Update DT binding documentation for external clock
    input
  serial: sh-sci: Update DT binding documentation for BRG support
  serial: sh-sci: Drop useless check for zero sampling_rate
  serial: sh-sci: Grammar s/Get ... for/Get ... from/
  serial: sh-sci: Drop unused frame_len parameter for
    sci_baud_calc_hscif()
  serial: sh-sci: Don't overwrite clock selection in
    serial_console_write()
  serial: sh-sci: Convert from clk_get() to devm_clk_get()
  serial: sh-sci: Make unsigned values in sci_baud_calc_hscif() unsigned
  serial: sh-sci: Avoid overflow in sci_baud_calc_hscif()
  serial: sh-sci: Improve bit rate error calculation for HSCIF
  serial: sh-sci: Avoid calculating the receive margin for HSCIF
  serial: sh-sci: Merge sci_scbrr_calc() and sci_baud_calc_hscif()
  serial: sh-sci: Take into account sampling rate for max baud rate
  serial: sh-sci: Add BRG register definitions
  serial: sh-sci: Replace struct sci_port_info by type/regtype encoding
  serial: sh-sci: Correct SCIF type on RZ/A1H
  serial: sh-sci: Correct SCIF type on R-Car for BRG
  serial: sh-sci: Prepare for multiple clocks and baud rate generators
  serial: sh-sci: Add support for optional external (H)SCK input
  serial: sh-sci: Add support for optional BRG on (H)SCIF
  ARM: shmobile: r8a7791 dtsi: Add BRG support for (H)SCIF
  ARM: shmobile: koelsch dts: Enable SCIF_CLK frequency and pins
  arm64: renesas: r8a7795 dtsi: Add BRG support for (H)SCIF
  arm64: renesas: salvator-x dts: Enable SCIF_CLK frequency and pins
  sh: sh7734: Correct SCIF type for BRG

 .../bindings/serial/renesas,sci-serial.txt         |   9 +
 arch/arm/boot/dts/r8a7791-koelsch.dts              |  13 +
 arch/arm/boot/dts/r8a7791.dtsi                     |  54 ++-
 arch/arm64/boot/dts/renesas/r8a7795-salvator-x.dts |  12 +
 arch/arm64/boot/dts/renesas/r8a7795.dtsi           |  74 ++-
 arch/sh/kernel/cpu/sh4a/setup-sh7734.c             |  12 +-
 drivers/tty/serial/sh-sci.c                        | 530 +++++++++++++++------
 drivers/tty/serial/sh-sci.h                        |   5 +
 include/linux/serial_sci.h                         |   1 +
 9 files changed, 508 insertions(+), 202 deletions(-)

-- 
1.9.1

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds
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[PATCH 00/25] serial: sh-sci: Add external clock and BRG Support Geert Uytterhoeven <geert+renesas@glider.be> - 2015-11-19 19:50 +0100
  [PATCH 22/25] ARM: shmobile: koelsch dts: Enable SCIF_CLK frequency and pins Geert Uytterhoeven <geert+renesas@glider.be> - 2015-11-19 19:50 +0100
  [PATCH 16/25] serial: sh-sci: Correct SCIF type on RZ/A1H Geert Uytterhoeven <geert+renesas@glider.be> - 2015-11-19 19:50 +0100
  [PATCH 20/25] serial: sh-sci: Add support for optional BRG on (H)SCIF Geert Uytterhoeven <geert+renesas@glider.be> - 2015-11-19 19:50 +0100
  [PATCH 18/25] serial: sh-sci: Prepare for multiple clocks and baud rate generators Geert Uytterhoeven <geert+renesas@glider.be> - 2015-11-19 19:50 +0100
    Re: [PATCH 18/25] serial: sh-sci: Prepare for multiple clocks and baud rate generators Laurent Pinchart <laurent.pinchart@ideasonboard.com> - 2015-11-19 22:10 +0100
      Re: [PATCH 18/25] serial: sh-sci: Prepare for multiple clocks and  baud rate generators Geert Uytterhoeven <geert@linux-m68k.org> - 2015-11-20 09:00 +0100
        Re: [PATCH 18/25] serial: sh-sci: Prepare for multiple clocks and baud rate generators Laurent Pinchart <laurent.pinchart@ideasonboard.com> - 2015-11-20 15:50 +0100
          Re: [PATCH 18/25] serial: sh-sci: Prepare for multiple clocks and  baud rate generators Geert Uytterhoeven <geert@linux-m68k.org> - 2015-11-20 16:20 +0100
            Re: [PATCH 18/25] serial: sh-sci: Prepare for multiple clocks and baud rate generators Laurent Pinchart <laurent.pinchart@ideasonboard.com> - 2015-11-20 16:40 +0100
  [PATCH 05/25] serial: sh-sci: Drop unused frame_len parameter for sci_baud_calc_hscif() Geert Uytterhoeven <geert+renesas@glider.be> - 2015-11-19 19:50 +0100
  [PATCH 23/25] arm64: renesas: r8a7795 dtsi: Add BRG support for (H)SCIF Geert Uytterhoeven <geert+renesas@glider.be> - 2015-11-19 19:50 +0100
    Re: [PATCH 23/25] arm64: renesas: r8a7795 dtsi: Add BRG support for (H)SCIF Laurent Pinchart <laurent.pinchart@ideasonboard.com> - 2015-11-19 22:10 +0100
      Re: [PATCH 23/25] arm64: renesas: r8a7795 dtsi: Add BRG support for (H)SCIF Geert Uytterhoeven <geert@linux-m68k.org> - 2015-11-20 09:20 +0100
  [PATCH 02/25] serial: sh-sci: Update DT binding documentation for BRG support Geert Uytterhoeven <geert+renesas@glider.be> - 2015-11-19 19:50 +0100
    Re: [PATCH 02/25] serial: sh-sci: Update DT binding documentation for BRG support Laurent Pinchart <laurent.pinchart@ideasonboard.com> - 2015-11-19 21:30 +0100
      Re: [PATCH 02/25] serial: sh-sci: Update DT binding documentation for  BRG support Geert Uytterhoeven <geert@linux-m68k.org> - 2015-11-19 21:50 +0100
        Re: [PATCH 02/25] serial: sh-sci: Update DT binding documentation for BRG support Laurent Pinchart <laurent.pinchart@ideasonboard.com> - 2015-11-19 22:20 +0100
          Re: [PATCH 02/25] serial: sh-sci: Update DT binding documentation for  BRG support Geert Uytterhoeven <geert@linux-m68k.org> - 2015-11-20 09:00 +0100
  [PATCH 04/25] serial: sh-sci: Grammar s/Get ... for/Get ... from/ Geert Uytterhoeven <geert+renesas@glider.be> - 2015-11-19 19:50 +0100
  [PATCH 17/25] serial: sh-sci: Correct SCIF type on R-Car for BRG Geert Uytterhoeven <geert+renesas@glider.be> - 2015-11-19 19:50 +0100
    Re: [PATCH 17/25] serial: sh-sci: Correct SCIF type on R-Car for BRG Laurent Pinchart <laurent.pinchart@ideasonboard.com> - 2015-11-19 22:00 +0100
      Re: [PATCH 17/25] serial: sh-sci: Correct SCIF type on R-Car for BRG Geert Uytterhoeven <geert@linux-m68k.org> - 2015-11-20 08:50 +0100
        Re: [PATCH 17/25] serial: sh-sci: Correct SCIF type on R-Car for BRG Laurent Pinchart <laurent.pinchart@ideasonboard.com> - 2015-11-20 16:00 +0100
          Re: [PATCH 17/25] serial: sh-sci: Correct SCIF type on R-Car for BRG Laurent Pinchart <laurent.pinchart@ideasonboard.com> - 2015-11-20 16:40 +0100
          Re: [PATCH 17/25] serial: sh-sci: Correct SCIF type on R-Car for BRG Geert Uytterhoeven <geert@linux-m68k.org> - 2015-11-20 16:40 +0100
  [PATCH 06/25] serial: sh-sci: Don't overwrite clock selection in serial_console_write() Geert Uytterhoeven <geert+renesas@glider.be> - 2015-11-19 19:50 +0100
  [PATCH 13/25] serial: sh-sci: Take into account sampling rate for max baud rate Geert Uytterhoeven <geert+renesas@glider.be> - 2015-11-19 19:50 +0100
  [PATCH 21/25] ARM: shmobile: r8a7791 dtsi: Add BRG support for (H)SCIF Geert Uytterhoeven <geert+renesas@glider.be> - 2015-11-19 19:50 +0100
  [PATCH 14/25] serial: sh-sci: Add BRG register definitions Geert Uytterhoeven <geert+renesas@glider.be> - 2015-11-19 19:50 +0100
    Re: [PATCH 14/25] serial: sh-sci: Add BRG register definitions Laurent Pinchart <laurent.pinchart@ideasonboard.com> - 2015-11-19 21:50 +0100
  [PATCH 07/25] serial: sh-sci: Convert from clk_get() to devm_clk_get() Geert Uytterhoeven <geert+renesas@glider.be> - 2015-11-19 19:50 +0100
    Re: [PATCH 07/25] serial: sh-sci: Convert from clk_get() to devm_clk_get() Laurent Pinchart <laurent.pinchart@ideasonboard.com> - 2015-11-19 21:40 +0100
  [PATCH 01/25] serial: sh-sci: Update DT binding documentation for external clock input Geert Uytterhoeven <geert+renesas@glider.be> - 2015-11-19 19:50 +0100
    Re: [PATCH 01/25] serial: sh-sci: Update DT binding documentation for external clock input Laurent Pinchart <laurent.pinchart@ideasonboard.com> - 2015-11-19 21:20 +0100
      Re: [PATCH 01/25] serial: sh-sci: Update DT binding documentation for external clock input Laurent Pinchart <laurent.pinchart@ideasonboard.com> - 2015-11-19 21:30 +0100
        Re: [PATCH 01/25] serial: sh-sci: Update DT binding documentation for  external clock input Geert Uytterhoeven <geert@linux-m68k.org> - 2015-11-19 21:50 +0100
          Re: [PATCH 01/25] serial: sh-sci: Update DT binding documentation for external clock input Laurent Pinchart <laurent.pinchart@ideasonboard.com> - 2015-11-19 22:20 +0100
            Re: [PATCH 01/25] serial: sh-sci: Update DT binding documentation for  external clock input Geert Uytterhoeven <geert@linux-m68k.org> - 2015-11-20 09:10 +0100
      Re: [PATCH 01/25] serial: sh-sci: Update DT binding documentation for  external clock input Geert Uytterhoeven <geert@linux-m68k.org> - 2015-11-19 21:40 +0100
  [PATCH 03/25] serial: sh-sci: Drop useless check for zero sampling_rate Geert Uytterhoeven <geert+renesas@glider.be> - 2015-11-19 19:50 +0100
  [PATCH 24/25] arm64: renesas: salvator-x dts: Enable SCIF_CLK frequency and pins Geert Uytterhoeven <geert+renesas@glider.be> - 2015-11-19 19:50 +0100
  [PATCH 19/25] serial: sh-sci: Add support for optional external (H)SCK input Geert Uytterhoeven <geert+renesas@glider.be> - 2015-11-19 19:50 +0100
  [PATCH 11/25] serial: sh-sci: Avoid calculating the receive margin for HSCIF Geert Uytterhoeven <geert+renesas@glider.be> - 2015-11-19 20:00 +0100
  [PATCH 12/25] serial: sh-sci: Merge sci_scbrr_calc() and sci_baud_calc_hscif() Geert Uytterhoeven <geert+renesas@glider.be> - 2015-11-19 20:00 +0100
  [PATCH 10/25] serial: sh-sci: Improve bit rate error calculation for HSCIF Geert Uytterhoeven <geert+renesas@glider.be> - 2015-11-19 20:00 +0100
  Re: [PATCH 00/25] serial: sh-sci: Add external clock and BRG Support Laurent Pinchart <laurent.pinchart@ideasonboard.com> - 2015-11-19 22:10 +0100
    Re: [PATCH 00/25] serial: sh-sci: Add external clock and BRG Support Geert Uytterhoeven <geert@linux-m68k.org> - 2015-11-20 09:30 +0100
      Re: [PATCH 00/25] serial: sh-sci: Add external clock and BRG Support Laurent Pinchart <laurent.pinchart@ideasonboard.com> - 2015-11-20 10:00 +0100
        Re: [PATCH 00/25] serial: sh-sci: Add external clock and BRG Support Geert Uytterhoeven <geert@linux-m68k.org> - 2015-11-20 10:10 +0100
          Re: [PATCH 00/25] serial: sh-sci: Add external clock and BRG Support Laurent Pinchart <laurent.pinchart@ideasonboard.com> - 2015-11-20 16:00 +0100
            Re: [PATCH 00/25] serial: sh-sci: Add external clock and BRG Support Geert Uytterhoeven <geert@linux-m68k.org> - 2015-11-20 16:40 +0100
  Re: [PATCH 00/25] serial: sh-sci: Add external clock and BRG Support Geert Uytterhoeven <geert@linux-m68k.org> - 2015-11-20 10:10 +0100
  Re: [PATCH 00/25] serial: sh-sci: Add external clock and BRG Support Simon Horman <horms@verge.net.au> - 2015-11-24 03:50 +0100

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