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| author | Sekhar Nori <nsekhar@ti.com> | 2012-08-29 19:18:52 +0200 |
|---|---|---|
| committer | Sekhar Nori <nsekhar@ti.com> | 2012-10-27 12:58:31 +0200 |
| commit | 76d57ce6ef6060f611c14675249b7300a3c96368 (patch) | |
| tree | ee5aff6789cc9b5d79caca405cc622cb29669aae | |
| parent | ARM: davinci: convert platform code to use clk_prepare/clk_unprepare (diff) | |
| download | linux-76d57ce6ef6060f611c14675249b7300a3c96368.tar.xz linux-76d57ce6ef6060f611c14675249b7300a3c96368.zip | |
ARM: davinci: serial: provide API to initialze UART clocks
Provide an API to initialize a UART clock. Refactor existing
davinci_serial_init() to separate out the part which enables
the clock.
This will later be used to help DA850 DT boot support.
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
| -rw-r--r-- | arch/arm/mach-davinci/include/mach/serial.h | 1 | ||||
| -rw-r--r-- | arch/arm/mach-davinci/serial.c | 39 |
2 files changed, 28 insertions, 12 deletions
diff --git a/arch/arm/mach-davinci/include/mach/serial.h b/arch/arm/mach-davinci/include/mach/serial.h index 46b3cd11c3c2..2d9d921e8b01 100644 --- a/arch/arm/mach-davinci/include/mach/serial.h +++ b/arch/arm/mach-davinci/include/mach/serial.h @@ -43,6 +43,7 @@ struct davinci_uart_config { }; extern int davinci_serial_init(struct davinci_uart_config *); +extern int davinci_serial_setup_clk(unsigned instance, unsigned int *rate); #endif #endif /* __ASM_ARCH_SERIAL_H */ diff --git a/arch/arm/mach-davinci/serial.c b/arch/arm/mach-davinci/serial.c index 24ddb0d32a0f..f2625814c3c9 100644 --- a/arch/arm/mach-davinci/serial.c +++ b/arch/arm/mach-davinci/serial.c @@ -70,11 +70,33 @@ static void __init davinci_serial_reset(struct plat_serial8250_port *p) UART_DM646X_SCR_TX_WATERMARK); } -int __init davinci_serial_init(struct davinci_uart_config *info) +/* Enable UART clock and obtain its rate */ +int __init davinci_serial_setup_clk(unsigned instance, unsigned int *rate) { - int i; char name[16]; - struct clk *uart_clk; + struct clk *clk; + struct davinci_soc_info *soc_info = &davinci_soc_info; + struct device *dev = &soc_info->serial_dev->dev; + + sprintf(name, "uart%d", instance); + clk = clk_get(dev, name); + if (IS_ERR(clk)) { + pr_err("%s:%d: failed to get UART%d clock\n", + __func__, __LINE__, instance); + return PTR_ERR(clk); + } + + clk_prepare_enable(clk); + + if (rate) + *rate = clk_get_rate(clk); + + return 0; +} + +int __init davinci_serial_init(struct davinci_uart_config *info) +{ + int i, ret; struct davinci_soc_info *soc_info = &davinci_soc_info; struct device *dev = &soc_info->serial_dev->dev; struct plat_serial8250_port *p = dev->platform_data; @@ -87,16 +109,9 @@ int __init davinci_serial_init(struct davinci_uart_config *info) if (!(info->enabled_uarts & (1 << i))) continue; - sprintf(name, "uart%d", i); - uart_clk = clk_get(dev, name); - if (IS_ERR(uart_clk)) { - printk(KERN_ERR "%s:%d: failed to get UART%d clock\n", - __func__, __LINE__, i); + ret = davinci_serial_setup_clk(i, &p->uartclk); + if (ret) continue; - } - - clk_prepare_enable(uart_clk); - p->uartclk = clk_get_rate(uart_clk); if (!p->membase && p->mapbase) { p->membase = ioremap(p->mapbase, SZ_4K); |