| Message ID | 1448055950-21190-1-git-send-email-leoli@freescale.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Fri, Nov 20, 2015 at 10:45 PM, Li Yang <leoli@freescale.com> wrote: > - if (IS_ERR(i2c_imx->pinctrl)) { > + /* bailout on -ENOMEM or -EPROBE_DEFER, continue for other errors */ > + if (PTR_ERR(i2c_imx->pinctrl) == -ENOMEM || > + PTR_ERR(i2c_imx->pinctrl) == -EPROBE_DEFER) { This is one of the evils of deferred probe: you never know if something will eventually turn up. It feels wrong to bail out on deferred probe... I have no better idea though. Acked-by Yours, Linus Walleij
On Mon, Nov 30, 2015 at 01:55:19PM +0100, Linus Walleij wrote: > On Fri, Nov 20, 2015 at 10:45 PM, Li Yang <leoli@freescale.com> wrote: > > > - if (IS_ERR(i2c_imx->pinctrl)) { > > + /* bailout on -ENOMEM or -EPROBE_DEFER, continue for other errors */ > > + if (PTR_ERR(i2c_imx->pinctrl) == -ENOMEM || > > + PTR_ERR(i2c_imx->pinctrl) == -EPROBE_DEFER) { > > This is one of the evils of deferred probe: you never know if > something will eventually turn up. It feels wrong to bail out > on deferred probe... > > I have no better idea though. > Acked-by Linus, proper ack next time please, so patchwork will pick it up automatically. Li Yang: There have been some other changes to the imx driver. Could you rebase against my for-next or for-4.5 and add Linus' ack? Thanks!
diff --git a/drivers/i2c/busses/i2c-imx.c b/drivers/i2c/busses/i2c-imx.c index 9bb0b05..41289f8 100644 --- a/drivers/i2c/busses/i2c-imx.c +++ b/drivers/i2c/busses/i2c-imx.c @@ -1087,8 +1087,11 @@ static int i2c_imx_probe(struct platform_device *pdev) return ret; } + /* optional bus recovery feature through pinctrl */ i2c_imx->pinctrl = devm_pinctrl_get(&pdev->dev); - if (IS_ERR(i2c_imx->pinctrl)) { + /* bailout on -ENOMEM or -EPROBE_DEFER, continue for other errors */ + if (PTR_ERR(i2c_imx->pinctrl) == -ENOMEM || + PTR_ERR(i2c_imx->pinctrl) == -EPROBE_DEFER) { ret = PTR_ERR(i2c_imx->pinctrl); goto clk_disable; } @@ -1126,7 +1129,10 @@ static int i2c_imx_probe(struct platform_device *pdev) goto clk_disable; } - i2c_imx_init_recovery_info(i2c_imx, pdev); + if (IS_ERR_OR_NULL(i2c_imx->pinctrl)) + dev_info(&pdev->dev, "can't get pinctrl, bus recovery feature disabled\n"); + else + i2c_imx_init_recovery_info(i2c_imx, pdev); /* Set up platform driver data */ platform_set_drvdata(pdev, i2c_imx);
Since commit 1c4b6c3bcf30 ("i2c: imx: implement bus recovery") the driver starts to use gpio/pinctrl to do i2c bus recovery. But pinctrl is not always available for platforms using this driver such as ls1021a and ls1043a, and the device tree binding also mentioned this gpio based recovery mechanism as optional. The patch make it really optional that the probe function won't bailout when pinctrl is not available and it won't try to register recovery functions if pinctrl is NULL when the PINCTRL is not enabled at all. Signed-off-by: Li Yang <leoli@freescale.com> Cc: Gao Pan <b54642@freescale.com> --- v2: bailout on -ENOMEM and -EPROBE_DEFER drivers/i2c/busses/i2c-imx.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-)