diff options
| author | Jia Wang <wangjia@ultrarisc.com> | 2026-04-29 17:13:28 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2026-05-11 17:00:43 +0200 |
| commit | 4a9a0b1a82a8b23eb68032dd19b120e82cd67004 (patch) | |
| tree | 392eb6f89d8dc3df1a44ca0acca6d399f5e672e8 /drivers | |
| parent | d22d2e54f660eeb64e06f2cb6db068dac66a5733 (diff) | |
serial: 8250_dw: Use a fixed CPR value for UltraRISC DP1000 UART
The UltraRISC DP1000 UART does not provide the standard CPR register used
by 8250_dw to discover port capabilities.
Provide a fixed CPR value for the DP1000-specific compatible so the
driver can configure the port correctly.
Signed-off-by: Jia Wang <wangjia@ultrarisc.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://patch.msgid.link/20260429-ultrarisc-serial-v7-4-e475cce9e274@ultrarisc.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/tty/serial/8250/8250_dw.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c index 480f82d89856..55e40c10f46a 100644 --- a/drivers/tty/serial/8250/8250_dw.c +++ b/drivers/tty/serial/8250/8250_dw.c @@ -959,6 +959,15 @@ static const struct dw8250_platform_data dw8250_intc10ee = { .quirks = DW_UART_QUIRK_IER_KICK, }; +static const struct dw8250_platform_data dw8250_ultrarisc_dp1000_data = { + .usr_reg = DW_UART_USR, + .cpr_value = FIELD_PREP_CONST(DW_UART_CPR_ABP_DATA_WIDTH, 2) | + DW_UART_CPR_THRE_MODE | + DW_UART_CPR_DMA_EXTRA | + DW_UART_CPR_FIFO_MODE_FROM_SIZE(32), + .quirks = DW_UART_QUIRK_CPR_VALUE, +}; + static const struct of_device_id dw8250_of_match[] = { { .compatible = "snps,dw-apb-uart", .data = &dw8250_dw_apb }, { .compatible = "cavium,octeon-3860-uart", .data = &dw8250_octeon_3860_data }, @@ -966,6 +975,7 @@ static const struct of_device_id dw8250_of_match[] = { { .compatible = "renesas,rzn1-uart", .data = &dw8250_renesas_rzn1_data }, { .compatible = "sophgo,sg2044-uart", .data = &dw8250_skip_set_rate_data }, { .compatible = "starfive,jh7100-uart", .data = &dw8250_skip_set_rate_data }, + { .compatible = "ultrarisc,dp1000-uart", .data = &dw8250_ultrarisc_dp1000_data }, { /* Sentinel */ } }; MODULE_DEVICE_TABLE(of, dw8250_of_match); |