i.MX ProcessorsのトピックRe: UART232/485

UART232/485

raje_embd13 — Tue, 06 Aug 2019 13:50:45 GMT

Hi ,

I am working on IMX6 dual.

In our Hardware the processor GPIO's are mapped to UART(LTC28xx). The Ltc28xx working in both RS232/RS485. On my environment RS485 mode is controlled by Processor GPIO pins.

The dtsi file is declared as below.

The Question is:: How to use these GPIO's in UART driver at run time to check pin status and control GPIO pins ?

&uart1 {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_tcs_uart1>;
status = "okay";
uart1_sel {
pins = "GPIO3_IO29"; /* RS232_485_SEL */
output-enable;
output-low;
};
uart1_en {
pins = "GPIO2_IO10"; /* RS232_485_EN */
output-enable;
output-high;
};
uart1_speed {
pins = "GPIO3_IO20"; /* RS232_SPEED, 1 - 1 mbps, 0 - 250 kbps */
output-enable;
output-high;
};
};

pinctrl_XXX_uart1: XXX-uart1 {
fsl,pins = <
MX6QDL_PAD_CSI0_DAT10__UART1_TX_DATA 0x1b0b1
MX6QDL_PAD_CSI0_DAT11__UART1_RX_DATA 0x1b0b1
MX6QDL_PAD_EIM_D29__GPIO3_IO29 0x1b0b1
MX6QDL_PAD_EIM_D20__GPIO3_IO20 0x1b0b1

Thanks,

Prasad

Re: UART232/485

igorpadykov — Tue, 06 Aug 2019 23:09:17 GMT

Hi VenkataNagaRajendra

for run time control of gpios, seems it is necessary to write custom

application using LTC28xx driver, which would control these gpios.

Best regards
igor
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Re: UART232/485

raje_embd13 — Wed, 07 Aug 2019 05:31:45 GMT

Hi Igor,

Yes, that's right. But where I can change / add Or implement application . I need these guide lines

Thanks,

Rajendra

Re: UART232/485

raje_embd13 — Wed, 07 Aug 2019 07:40:25 GMT

Hi Igor,

Is this patch help's me : http://marc.info/?l=linux-kernel&m=142366865609389&q=raw

Thanks,

RajendraPrasad

Re: UART232/485

igorpadykov — Wed, 07 Aug 2019 10:39:54 GMT

Hi Rajendra

yes it may help for rs485.

Best regards
igor