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bus: ts-nbus: Improve error reporting

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Using dev_err_probe() brings several improvements:

 - emits the symbolic error code
 - properly handles EPROBE_DEFER
 - combines error message generation and return value handling

While at it add error messages to two error paths that were silent
before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Uwe Kleine-König 2024-01-24 09:12:05 +01:00 committed by Arnd Bergmann
parent 8129d25e32
commit a04a7da398
No known key found for this signature in database
GPG Key ID: 60AB47FFC9095227
1 changed files with 28 additions and 38 deletions
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66
drivers/bus/ts-nbus.c
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@ -39,45 +39,39 @@ struct ts_nbus {
/*
* request all gpios required by the bus.
*/
static int ts_nbus_init_pdata(struct platform_device *pdev, struct ts_nbus
*ts_nbus)
static int ts_nbus_init_pdata(struct platform_device *pdev,
struct ts_nbus *ts_nbus)
{
ts_nbus->data = devm_gpiod_get_array(&pdev->dev, "ts,data",
GPIOD_OUT_HIGH);
if (IS_ERR(ts_nbus->data)) {
dev_err(&pdev->dev, "failed to retrieve ts,data-gpio from dts\n");
return PTR_ERR(ts_nbus->data);
}
if (IS_ERR(ts_nbus->data))
return dev_err_probe(&pdev->dev, PTR_ERR(ts_nbus->data),
"failed to retrieve ts,data-gpio from dts\n");
ts_nbus->csn = devm_gpiod_get(&pdev->dev, "ts,csn", GPIOD_OUT_HIGH);
if (IS_ERR(ts_nbus->csn)) {
dev_err(&pdev->dev, "failed to retrieve ts,csn-gpio from dts\n");
return PTR_ERR(ts_nbus->csn);
}
if (IS_ERR(ts_nbus->csn))
return dev_err_probe(&pdev->dev, PTR_ERR(ts_nbus->csn),
"failed to retrieve ts,csn-gpio from dts\n");
ts_nbus->txrx = devm_gpiod_get(&pdev->dev, "ts,txrx", GPIOD_OUT_HIGH);
if (IS_ERR(ts_nbus->txrx)) {
dev_err(&pdev->dev, "failed to retrieve ts,txrx-gpio from dts\n");
return PTR_ERR(ts_nbus->txrx);
}
if (IS_ERR(ts_nbus->txrx))
return dev_err_probe(&pdev->dev, PTR_ERR(ts_nbus->txrx),
"failed to retrieve ts,txrx-gpio from dts\n");
ts_nbus->strobe = devm_gpiod_get(&pdev->dev, "ts,strobe", GPIOD_OUT_HIGH);
if (IS_ERR(ts_nbus->strobe)) {
dev_err(&pdev->dev, "failed to retrieve ts,strobe-gpio from dts\n");
return PTR_ERR(ts_nbus->strobe);
}
if (IS_ERR(ts_nbus->strobe))
return dev_err_probe(&pdev->dev, PTR_ERR(ts_nbus->strobe),
"failed to retrieve ts,strobe-gpio from dts\n");
ts_nbus->ale = devm_gpiod_get(&pdev->dev, "ts,ale", GPIOD_OUT_HIGH);
if (IS_ERR(ts_nbus->ale)) {
dev_err(&pdev->dev, "failed to retrieve ts,ale-gpio from dts\n");
return PTR_ERR(ts_nbus->ale);
}
if (IS_ERR(ts_nbus->ale))
return dev_err_probe(&pdev->dev, PTR_ERR(ts_nbus->ale),
"failed to retrieve ts,ale-gpio from dts\n");
ts_nbus->rdy = devm_gpiod_get(&pdev->dev, "ts,rdy", GPIOD_IN);
if (IS_ERR(ts_nbus->rdy)) {
dev_err(&pdev->dev, "failed to retrieve ts,rdy-gpio from dts\n");
return PTR_ERR(ts_nbus->rdy);
}
if (IS_ERR(ts_nbus->rdy))
return dev_err_probe(&pdev->dev, PTR_ERR(ts_nbus->rdy),
"failed to retrieve ts,rdy-gpio from dts\n");
return 0;
}
@ -289,25 +283,20 @@ static int ts_nbus_probe(struct platform_device *pdev)
return ret;
pwm = devm_pwm_get(dev, NULL);
if (IS_ERR(pwm)) {
ret = PTR_ERR(pwm);
if (ret != -EPROBE_DEFER)
dev_err(dev, "unable to request PWM\n");
return ret;
}
if (IS_ERR(pwm))
return dev_err_probe(dev, PTR_ERR(pwm),
"unable to request PWM\n");
pwm_init_state(pwm, &state);
if (!state.period) {
dev_err(&pdev->dev, "invalid PWM period\n");
return -EINVAL;
}
if (!state.period)
return dev_err_probe(dev, -EINVAL, "invalid PWM period\n");
state.duty_cycle = state.period;
state.enabled = true;
ret = pwm_apply_state(pwm, &state);
if (ret < 0)
return ret;
return dev_err_probe(dev, ret, "failed to configure PWM\n");
/*
* we can now start the FPGA and populate the peripherals.
@ -321,7 +310,8 @@ static int ts_nbus_probe(struct platform_device *pdev)
ret = of_platform_populate(dev->of_node, NULL, NULL, dev);
if (ret < 0)
return ret;
return dev_err_probe(dev, ret,
"failed to populate platform devices on bus\n");
dev_info(dev, "initialized\n");