From mboxrd@z Thu Jan 1 00:00:00 1970 From: andrew@lunn.ch (Andrew Lunn) Date: Fri, 20 Jul 2012 19:35:38 +0200 Subject: [PATCH 3/16] ARM: Kirkwood: Ensure runit clock always ticks. In-Reply-To: <1342805751-18048-1-git-send-email-andrew@lunn.ch> References: <1342805751-18048-1-git-send-email-andrew@lunn.ch> Message-ID: <1342805751-18048-4-git-send-email-andrew@lunn.ch> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Marvell engineers tell us: It seems that many units use the RUNIT clock. SPI, UART, NAND, TWSI, ... So it's not possible to clock gate it. Currently the SPI, NAND and TWSI driver will clk_prepaure_enable() this clk, but since we have no idea what ... is, and turning this clk off results in a hard lock, unconditionally enable runit. Signed-off-by: Andrew Lunn Tested-by: Simon Baatz --- arch/arm/mach-kirkwood/common.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/arch/arm/mach-kirkwood/common.c b/arch/arm/mach-kirkwood/common.c index f261cd2..3de2d6d 100644 --- a/arch/arm/mach-kirkwood/common.c +++ b/arch/arm/mach-kirkwood/common.c @@ -241,6 +241,11 @@ void __init kirkwood_clk_init(void) orion_clkdev_add("0", "pcie", pex0); orion_clkdev_add("1", "pcie", pex1); orion_clkdev_add(NULL, "kirkwood-i2s", audio); + + /* Marvell says runit is used by SPI, UART, NAND, TWSI, ..., + * so should never be gated. + */ + clk_prepare_enable(runit); } /***************************************************************************** -- 1.7.10