From: Leonard Crestez <leonard.crestez@nxp.com>
To: "broonie@kernel.org" <broonie@kernel.org>,
"linus.walleij@linaro.org" <linus.walleij@linaro.org>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Andy Duan <fugang.duan@nxp.com>,
Fabio Estevam <fabio.estevam@nxp.com>,
"linux-gpio@vger.kernel.org" <linux-gpio@vger.kernel.org>,
"lgirdwood@gmail.com" <lgirdwood@gmail.com>,
"shawnguo@kernel.org" <shawnguo@kernel.org>,
Anson Huang <anson.huang@nxp.com>,
"tony@atomide.com" <tony@atomide.com>,
"rppt@linux.vnet.ibm.com" <rppt@linux.vnet.ibm.com>,
"jmkrzyszt@gmail.com" <jmkrzyszt@gmail.com>,
"john.stultz@linaro.org" <john.stultz@linaro.org>
Subject: Re: [PATCH v7] regulator: fixed: Convert to use GPIO descriptor only
Date: Mon, 1 Oct 2018 18:53:37 +0000 [thread overview]
Message-ID: <afd78fe6a5e168cc9190afe3e27d12286e0dfafa.camel@nxp.com> (raw)
In-Reply-To: <20180906122436.25610-1-linus.walleij@linaro.org>
Hello,
This patch seems to break network booting on imx6sx-sdb in linux-next
because the enet phy regulator is not on. Reverting the patch fixes
boot.
Here is the regulator definition:
reg_enet_3v3: regulator-enet-3v3 {
compatible = "regulator-fixed";
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_enet_3v3>;
regulator-name = "enet_3v3";
regulator-min-microvolt = <3300000>;
regulator-max-microvolt = <3300000>;
gpios = <&gpio2 6 GPIO_ACTIVE_LOW>;
};
Here are some prints with the patch enabled:
[ 0.153150] reg-fixed-voltage regulator-enet-3v3: OUT_HIGH gflags 0x7
[ 0.153171] reg_fixed_voltage_probe(179): regulator-enet-3v3 call gpiod_get_optional gflags=0x7 ena_gpio_invert
[ 0.153218] regulator-enet-3v3 GPIO handle specifies active low - ignored
[ 0.153233] of_gpio_flags_quirks(83): regulator-enet-3v3 set active low because !enable-active-high
[ 0.153258] of_get_named_gpiod_flags: parsed 'gpios' property of node '/regulator-enet-3v3[0]' - status (0)
[ 0.153310] gpio_value: 38 set 0
[ 0.153332] gpio_direction: 38 out (0)
[ 0.153364] enet_3v3: ena_gpiod=(ptrval) ena_gpio=0 init=0 valid=1
[ 0.153377] enet_3v3: request GPIO
[ 0.153393] enet_3v3: already have gpiod
[ 0.153423] enet_3v3: 3300 mV
...
[ 3.867827] enet_3v3: GPIO enable count=0 inv=1
[ 3.872432] enet_3v3: set value 0
[ 3.875779] gpio_value: 38 set 1
That "gpio_value: 30 set 1" tracepoint is wrong, the line is set high.
It seems that gpiod_set_value will check FLAG_ACTIVE_LOW and
automatically invert so maybe ena_gpio_invert should not be used if a
full gpiod is passed to regulator?
--- drivers/regulator/fixed.c
+++ drivers/regulator/fixed.c
@@ -146,7 +146,6 @@ static int reg_fixed_voltage_probe(struct
platform_device *pdev)
drvdata->desc.fixed_uV = config->microvolts;
- cfg.ena_gpio_invert = !config->enable_high;
if (config->enabled_at_boot) {
if (config->enable_high)
gflags = GPIOD_OUT_HIGH;
All these high/low inversions and flags are extremely confusing to me.
Link to original thread: https://lkml.org/lkml/2018/9/6/485
--
Regards,
Leonard
next prev parent reply other threads:[~2018-10-01 18:53 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-06 12:24 [PATCH v7] regulator: fixed: Convert to use GPIO descriptor only Linus Walleij
2018-09-10 17:01 ` Janusz Krzysztofik
2018-09-11 16:06 ` Mike Rapoport
2018-09-28 23:32 ` John Stultz
2018-09-29 17:38 ` Linus Walleij
2018-10-01 18:53 ` Leonard Crestez [this message]
2018-10-01 20:16 ` Linus Walleij
2018-10-01 20:37 ` Fabio Estevam
2018-10-01 20:48 ` Linus Walleij
[not found] ` <CGME20181011090112eucas1p286d8c1edfc1a2a207d8a11c5ad7eb20e@eucas1p2.samsung.com>
2018-10-11 9:01 ` Marek Szyprowski
2018-10-11 9:29 ` Linus Walleij
2018-10-11 9:46 ` Marek Szyprowski
2018-10-11 13:15 ` Mark Brown
2018-10-11 15:00 ` Jon Hunter
2018-10-11 15:34 ` Marcel Ziswiler
2018-10-11 17:47 ` Linus Walleij
2018-10-12 9:43 ` Marcel Ziswiler
2018-10-12 10:39 ` Jon Hunter
2018-10-12 10:43 ` Russell King - ARM Linux
2018-10-12 11:03 ` Linus Walleij
2018-10-12 11:43 ` Marcel Ziswiler
2018-10-12 12:59 ` Russell King - ARM Linux
2018-10-12 13:13 ` Marcel Ziswiler
2018-10-12 16:57 ` Mark Brown
2018-10-12 13:58 ` Andy Shevchenko
2018-10-12 16:17 ` Mark Brown
2018-10-11 17:45 ` Linus Walleij
2018-10-12 10:25 ` Jon Hunter
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