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| author | Thomas Chou <thomas@wytron.com.tw> | 2015-11-19 21:48:05 +0800 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2015-11-20 20:41:29 -0500 |
| commit | 8e62d32e5ba2e79364f958079cf9f7e2e5a591a1 (patch) | |
| tree | 46cd63365949847d686899234d21e8d01f664f19 /drivers/serial/ns16550.c | |
| parent | 77d7b5cd40c41c6502c5e6256c7a47bd1d7c3388 (diff) | |
| download | u-boot-imx-8e62d32e5ba2e79364f958079cf9f7e2e5a591a1.zip u-boot-imx-8e62d32e5ba2e79364f958079cf9f7e2e5a591a1.tar.gz u-boot-imx-8e62d32e5ba2e79364f958079cf9f7e2e5a591a1.tar.bz2 | |
ns16550: add generic binding to unify the drivers
Add generic binding to unify ns16550 drivers. There are
several drivers using almost the same code, such as serial_dw,
serial_keystone, serial_omap, serial_ppc, serial_rockchip,
serial_tegra.c, and serial_x86. But each is platform specific.
The key difference between these drivers is the way to get
input clock frequency. With this unified approach, fixed clock
frequency should be extracted from "clock-frequency" property of
device tree blob. If this property is not available, the macro
CONFIG_SYS_NS16550_CLK will be used. It can be a constant or a
function to get clock, eg, get_serial_clock().
Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Heiko Schocher <hs@denx.de>
Acked-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'drivers/serial/ns16550.c')
| -rw-r--r-- | drivers/serial/ns16550.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/drivers/serial/ns16550.c b/drivers/serial/ns16550.c index 8d028de..f0a9aac 100644 --- a/drivers/serial/ns16550.c +++ b/drivers/serial/ns16550.c @@ -56,6 +56,10 @@ DECLARE_GLOBAL_DATA_PTR; #ifdef CONFIG_DM_SERIAL +#ifndef CONFIG_SYS_NS16550_CLK +#define CONFIG_SYS_NS16550_CLK 0 +#endif + static inline void serial_out_shift(void *addr, int shift, int value) { #ifdef CONFIG_SYS_NS16550_PORT_MAPPED @@ -400,6 +404,15 @@ int ns16550_serial_ofdata_to_platdata(struct udevice *dev) plat->base = addr; plat->reg_shift = fdtdec_get_int(gd->fdt_blob, dev->of_offset, "reg-shift", 1); +#ifdef CONFIG_NS16550_SERIAL + plat->clock = fdtdec_get_int(gd->fdt_blob, dev->of_offset, + "clock-frequency", + CONFIG_SYS_NS16550_CLK); + if (!plat->clock) { + debug("ns16550 clock not defined\n"); + return -EINVAL; + } +#endif /* CONFIG_NS16550_SERIAL */ return 0; } @@ -411,4 +424,35 @@ const struct dm_serial_ops ns16550_serial_ops = { .getc = ns16550_serial_getc, .setbrg = ns16550_serial_setbrg, }; + +#ifdef CONFIG_NS16550_SERIAL +#if CONFIG_IS_ENABLED(OF_CONTROL) +static const struct udevice_id ns16550_serial_ids[] = { + { .compatible = "ns16550" }, + { .compatible = "ns16550a" }, + { .compatible = "nvidia,tegra20-uart" }, + { .compatible = "snps,dw-apb-uart" }, + { .compatible = "ti,omap2-uart" }, + { .compatible = "ti,omap3-uart" }, + { .compatible = "ti,omap4-uart" }, + { .compatible = "ti,am3352-uart" }, + { .compatible = "ti,am4372-uart" }, + { .compatible = "ti,dra742-uart" }, + {} +}; +#endif + +U_BOOT_DRIVER(ns16550_serial) = { + .name = "ns16550_serial", + .id = UCLASS_SERIAL, +#if CONFIG_IS_ENABLED(OF_CONTROL) + .of_match = ns16550_serial_ids, + .ofdata_to_platdata = ns16550_serial_ofdata_to_platdata, + .platdata_auto_alloc_size = sizeof(struct ns16550_platdata), +#endif + .priv_auto_alloc_size = sizeof(struct NS16550), + .probe = ns16550_serial_probe, + .ops = &ns16550_serial_ops, +}; +#endif /* CONFIG_NS16550_SERIAL */ #endif /* CONFIG_DM_SERIAL */ |