Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934814AbbKSSpj (ORCPT ); Thu, 19 Nov 2015 13:45:39 -0500 Received: from andre.telenet-ops.be ([195.130.132.53]:47869 "EHLO andre.telenet-ops.be" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934513AbbKSSjF (ORCPT ); Thu, 19 Nov 2015 13:39:05 -0500 From: Geert Uytterhoeven To: Greg Kroah-Hartman , Simon Horman , Magnus Damm , Yoshinori Sato , Laurent Pinchart Cc: linux-serial@vger.kernel.org, linux-sh@vger.kernel.org, linux-kernel@vger.kernel.org, Geert Uytterhoeven Subject: [PATCH 00/25] serial: sh-sci: Add external clock and BRG Support Date: Thu, 19 Nov 2015 19:38:39 +0100 Message-Id: <1447958344-836-1-git-send-email-geert+renesas@glider.be> X-Mailer: git-send-email 1.9.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4779 Lines: 103 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/