Hi Simon, Magnus, This patch series adds support for the external crystal feeding SCIF_CLK to (H)SCIF on the various R-Car Gen1, Gen2, and Gen3 development boards. This increases the range and accuracy of supported baud rates. This series is an updated version of a part of a series I sent before as "[PATCH v2 00/16] serial: sh-sci: Clock Cleanups" (http://www.spinics.net/lists/linux-serial/msg19762.html). To reduce (cross) dependencies, I split off the core patches and some DT parts into separate series. Changes compared to previous submission: - Add support for r8a7778/bockw, r8a7779/marzen, r8a7790/lager, r8a7791/porter, r8a7793/gose, r8a7794/alt, and r8a7794/silk, - Add Reviewed-by. Dependencies: - This series is against renesas-devel-20151214-v4.4-rc5, with the following applied on top: - "[PATCH 0/7] ARM: shmobile: dtsi: Add SCIF fallback compatibility strings", - "[PATCH v3 00/12] ARM: shmobile: dtsi: Rename the serial port clock to fck", - "[PATCH v2 0/7] ARM: shmobile: dtsi: Add BRG support for (H)SCIF", - This has runtime dependencies on: - "[PATCH 0/2] pinctrl: sh-pfc: r8a7791/r8a7795: Add SCIF_CLK support", - "[PATCH 0/3] pinctrl: sh-pfc: r8a7779/r8a7790/r8a7794: Add SCIF_CLK support", unless you want to depend on pinctrl as configured by U-Boot (on most, but not all R-Car Gen2 boards). Note that I plan to get the pinctrl dependencies in v4.5, so this series should be OK to queue for v4.6. Note that the bockw pinctrl support is already upstream. Testing: - This was tested locally on r8a7791/koelsch and r8a7795/salvator-x, - This was tested remotely on r8a7778/bockw and r8a7779/marzen, - Testing on other boards would be highly appreciated! - Hints for various levels of testing: - Change the "dev_dbg" after "done:" in drivers/tty/serial/sh-sci.c to "dev_info" to print clock and bit rate, - "yes U | tr -d '\n' > /dev/ttySCx" outputs a square wave with a frequency of half the bit rate on TXD, - Modifying the frequency of SCIF_CLK causes garbage on the serial console, unless you compensate by changing the bit rate in /chosen/stdout-path, - If you disable the SCIF_CLK, the brg_int clock will be used. If you change that clock, you'll get garbage again, - renesas-drivers-2015-12-14-v4.4-rc5 has all dependencies https://git.kernel.org/cgit/linux/kernel/git/geert/renesas-drivers.git Thanks! Geert Uytterhoeven (9): ARM: shmobile: alt dts: Enable SCIF_CLK frequency and pins ARM: shmobile: bockw dts: Enable SCIF_CLK frequency and pins ARM: shmobile: gose dts: Enable SCIF_CLK frequency and pins ARM: shmobile: koelsch dts: Enable SCIF_CLK frequency and pins ARM: shmobile: lager dts: Enable SCIF_CLK frequency and pins ARM: shmobile: marzen dts: Enable SCIF_CLK frequency and pins ARM: shmobile: porter dts: Enable SCIF_CLK frequency and pins ARM: shmobile: silk dts: Enable SCIF_CLK frequency and pins arm64: renesas: salvator-x dts: Enable SCIF_CLK frequency and pins arch/arm/boot/dts/r8a7778-bockw.dts | 13 +++++++++++++ arch/arm/boot/dts/r8a7779-marzen.dts | 13 +++++++++++++ arch/arm/boot/dts/r8a7790-lager.dts | 13 +++++++++++++ arch/arm/boot/dts/r8a7791-koelsch.dts | 13 +++++++++++++ arch/arm/boot/dts/r8a7791-porter.dts | 13 +++++++++++++ arch/arm/boot/dts/r8a7793-gose.dts | 13 +++++++++++++ arch/arm/boot/dts/r8a7794-alt.dts | 13 +++++++++++++ arch/arm/boot/dts/r8a7794-silk.dts | 13 +++++++++++++ arch/arm64/boot/dts/renesas/r8a7795-salvator-x.dts | 12 ++++++++++++ 9 files changed, 116 insertions(+) -- 1.9.1 Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx 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-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
