From mboxrd@z Thu Jan 1 00:00:00 1970 From: swarren@nvidia.com (Stephen Warren) Date: Thu, 2 Feb 2012 12:24:19 -0700 Subject: [PATCH] ARM: dt: Explicitly configure all serial ports on Tegra Cardhu Message-ID: <1328210659-16869-1-git-send-email-swarren@nvidia.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org The ports are used as follows: UART1/A: Routed to debug dongle UART2/B: GPS UART3/C: Bluetooth UART4/D: Routed to debug dongle UART5/E: Not connected The debug dongle has jumpers to connect either UART1/A or UART4/D to the DB-9 connector. UART1/A is typically used on Cardhu, and is the option we assume here. For now, only enable UART1/A, and explicitly disable all other ports. The explicit disable prevents the message "of_serial 70006040.serial: no clock-frequency property set" being printed during boot. Enabling the other ports requires their clocks to be enabled, or accesses to the registers will hang. At present, this requires adding entries into board-dt-tegra30.c's tegra_dt_clk_init_table[]. Lets punt on that and wait for the common clock bindings to set this all up, although that will also requiring adding clock support to 8250.c. While we're at it, fix board-dt-tegra30.c to enable the correct clock for the debug UART. We got away with this before, because the bootloader already enabled it. Signed-off-by: Stephen Warren --- arch/arm/boot/dts/tegra-cardhu.dts | 16 ++++++++++++++++ arch/arm/mach-tegra/board-dt-tegra30.c | 2 +- 2 files changed, 17 insertions(+), 1 deletions(-) diff --git a/arch/arm/boot/dts/tegra-cardhu.dts b/arch/arm/boot/dts/tegra-cardhu.dts index 7326350..ac3fb75 100644 --- a/arch/arm/boot/dts/tegra-cardhu.dts +++ b/arch/arm/boot/dts/tegra-cardhu.dts @@ -14,6 +14,22 @@ clock-frequency = < 408000000 >; }; + serial at 70006040 { + status = "disable"; + }; + + serial at 70006200 { + status = "disable"; + }; + + serial at 70006300 { + status = "disable"; + }; + + serial at 70006400 { + status = "disable"; + }; + i2c at 7000c000 { clock-frequency = <100000>; }; diff --git a/arch/arm/mach-tegra/board-dt-tegra30.c b/arch/arm/mach-tegra/board-dt-tegra30.c index 918cbbf..731a231 100644 --- a/arch/arm/mach-tegra/board-dt-tegra30.c +++ b/arch/arm/mach-tegra/board-dt-tegra30.c @@ -60,7 +60,7 @@ struct of_dev_auxdata tegra30_auxdata_lookup[] __initdata = { static __initdata struct tegra_clk_init_table tegra_dt_clk_init_table[] = { /* name parent rate enabled */ - { "uartd", "pll_p", 408000000, true }, + { "uarta", "pll_p", 408000000, true }, { NULL, NULL, 0, 0}, }; -- 1.7.0.4