Starting with
commit 75820314de26 ("i2c: core: add generic I2C GPIO recovery")
GPIO bus recovery is supported by the I2C core, so we can remove the
driver implementation and use that one instead.
Signed-off-by: Codrin Ciubotariu <[email protected]>
---
This patch is not tested.
Changes in v2:
- readded the pinctrl state change to default from the
unprepare_recovery callback;
drivers/i2c/busses/i2c-pxa.c | 73 +++---------------------------------
1 file changed, 6 insertions(+), 67 deletions(-)
diff --git a/drivers/i2c/busses/i2c-pxa.c b/drivers/i2c/busses/i2c-pxa.c
index 35ca2c02c9b9..006cc1d5931f 100644
--- a/drivers/i2c/busses/i2c-pxa.c
+++ b/drivers/i2c/busses/i2c-pxa.c
@@ -264,9 +264,6 @@ struct pxa_i2c {
u32 hs_mask;
struct i2c_bus_recovery_info recovery;
- struct pinctrl *pinctrl;
- struct pinctrl_state *pinctrl_default;
- struct pinctrl_state *pinctrl_recovery;
};
#define _IBMR(i2c) ((i2c)->reg_ibmr)
@@ -1305,8 +1302,6 @@ static void i2c_pxa_prepare_recovery(struct i2c_adapter *adap)
*/
gpiod_set_value(i2c->recovery.scl_gpiod, ibmr & IBMR_SCLS);
gpiod_set_value(i2c->recovery.sda_gpiod, ibmr & IBMR_SDAS);
-
- WARN_ON(pinctrl_select_state(i2c->pinctrl, i2c->pinctrl_recovery));
}
static void i2c_pxa_unprepare_recovery(struct i2c_adapter *adap)
@@ -1347,76 +1342,20 @@ static int i2c_pxa_init_recovery(struct pxa_i2c *i2c)
if (IS_ENABLED(CONFIG_I2C_PXA_SLAVE))
return 0;
- i2c->pinctrl = devm_pinctrl_get(dev);
- if (PTR_ERR(i2c->pinctrl) == -ENODEV)
- i2c->pinctrl = NULL;
- if (IS_ERR(i2c->pinctrl))
- return PTR_ERR(i2c->pinctrl);
-
- if (!i2c->pinctrl)
- return 0;
-
- i2c->pinctrl_default = pinctrl_lookup_state(i2c->pinctrl,
- PINCTRL_STATE_DEFAULT);
- i2c->pinctrl_recovery = pinctrl_lookup_state(i2c->pinctrl, "recovery");
-
- if (IS_ERR(i2c->pinctrl_default) || IS_ERR(i2c->pinctrl_recovery)) {
- dev_info(dev, "missing pinmux recovery information: %ld %ld\n",
- PTR_ERR(i2c->pinctrl_default),
- PTR_ERR(i2c->pinctrl_recovery));
- return 0;
- }
-
- /*
- * Claiming GPIOs can influence the pinmux state, and may glitch the
- * I2C bus. Do this carefully.
- */
- bri->scl_gpiod = devm_gpiod_get(dev, "scl", GPIOD_OUT_HIGH_OPEN_DRAIN);
- if (bri->scl_gpiod == ERR_PTR(-EPROBE_DEFER))
- return -EPROBE_DEFER;
- if (IS_ERR(bri->scl_gpiod)) {
- dev_info(dev, "missing scl gpio recovery information: %pe\n",
- bri->scl_gpiod);
- return 0;
- }
-
- /*
- * We have SCL. Pull SCL low and wait a bit so that SDA glitches
- * have no effect.
- */
- gpiod_direction_output(bri->scl_gpiod, 0);
- udelay(10);
- bri->sda_gpiod = devm_gpiod_get(dev, "sda", GPIOD_OUT_HIGH_OPEN_DRAIN);
-
- /* Wait a bit in case of a SDA glitch, and then release SCL. */
- udelay(10);
- gpiod_direction_output(bri->scl_gpiod, 1);
-
- if (bri->sda_gpiod == ERR_PTR(-EPROBE_DEFER))
- return -EPROBE_DEFER;
-
- if (IS_ERR(bri->sda_gpiod)) {
- dev_info(dev, "missing sda gpio recovery information: %pe\n",
- bri->sda_gpiod);
+ bri->pinctrl = devm_pinctrl_get(dev);
+ if (PTR_ERR(bri->pinctrl) == -ENODEV) {
+ bri->pinctrl = NULL;
return 0;
}
+ if (IS_ERR(bri->pinctrl))
+ return PTR_ERR(bri->pinctrl);
bri->prepare_recovery = i2c_pxa_prepare_recovery;
bri->unprepare_recovery = i2c_pxa_unprepare_recovery;
- bri->recover_bus = i2c_generic_scl_recovery;
i2c->adap.bus_recovery_info = bri;
- /*
- * Claiming GPIOs can change the pinmux state, which confuses the
- * pinctrl since pinctrl's idea of the current setting is unaffected
- * by the pinmux change caused by claiming the GPIO. Work around that
- * by switching pinctrl to the GPIO state here. We do it this way to
- * avoid glitching the I2C bus.
- */
- pinctrl_select_state(i2c->pinctrl, i2c->pinctrl_recovery);
-
- return pinctrl_select_state(i2c->pinctrl, i2c->pinctrl_default);
+ return 0;
}
static int i2c_pxa_probe(struct platform_device *dev)
--
2.25.1
On Sun, Oct 04, 2020 at 12:16:56PM +0300, Codrin Ciubotariu wrote:
> Starting with
> commit 75820314de26 ("i2c: core: add generic I2C GPIO recovery")
> GPIO bus recovery is supported by the I2C core, so we can remove the
> driver implementation and use that one instead.
>
> Signed-off-by: Codrin Ciubotariu <[email protected]>
> ---
>
> This patch is not tested.
>
> Changes in v2:
> - readded the pinctrl state change to default from the
> unprepare_recovery callback;
I don't think you've build tested this patch...
> diff --git a/drivers/i2c/busses/i2c-pxa.c b/drivers/i2c/busses/i2c-pxa.c
> index 35ca2c02c9b9..006cc1d5931f 100644
> --- a/drivers/i2c/busses/i2c-pxa.c
> +++ b/drivers/i2c/busses/i2c-pxa.c
> @@ -264,9 +264,6 @@ struct pxa_i2c {
> u32 hs_mask;
>
> struct i2c_bus_recovery_info recovery;
> - struct pinctrl *pinctrl;
> - struct pinctrl_state *pinctrl_default;
> - struct pinctrl_state *pinctrl_recovery;
i2c_pxa_unprepare_recovery() refers to pinctrl and pinctrl_default which
you've retained in this version of the patch, but you've deleted the
members from this structure - which will lead to a build error.
--
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!
On 04.10.2020 12:24, Russell King - ARM Linux admin wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
>
> On Sun, Oct 04, 2020 at 12:16:56PM +0300, Codrin Ciubotariu wrote:
>> Starting with
>> commit 75820314de26 ("i2c: core: add generic I2C GPIO recovery")
>> GPIO bus recovery is supported by the I2C core, so we can remove the
>> driver implementation and use that one instead.
>>
>> Signed-off-by: Codrin Ciubotariu <[email protected]>
>> ---
>>
>> This patch is not tested.
>>
>> Changes in v2:
>> - readded the pinctrl state change to default from the
>> unprepare_recovery callback;
>
> I don't think you've build tested this patch...
You're right, sorry about that. I used a wrong config... Will fix it
right away.
Best regards,
Codrin
>
>> diff --git a/drivers/i2c/busses/i2c-pxa.c b/drivers/i2c/busses/i2c-pxa.c
>> index 35ca2c02c9b9..006cc1d5931f 100644
>> --- a/drivers/i2c/busses/i2c-pxa.c
>> +++ b/drivers/i2c/busses/i2c-pxa.c
>> @@ -264,9 +264,6 @@ struct pxa_i2c {
>> u32 hs_mask;
>>
>> struct i2c_bus_recovery_info recovery;
>> - struct pinctrl *pinctrl;
>> - struct pinctrl_state *pinctrl_default;
>> - struct pinctrl_state *pinctrl_recovery;
>
> i2c_pxa_unprepare_recovery() refers to pinctrl and pinctrl_default which
> you've retained in this version of the patch, but you've deleted the
> members from this structure - which will lead to a build error.
>
> --
> RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
> FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!
>