From: Lucas Stach <l.stach@pengutronix.de>
To: barebox@lists.infradead.org
Subject: Re: [PATCH 1/2] ARM: rdu2: config PMIC SW1AB and SW1C rails to 1.375
Date: Mon, 17 Sep 2018 18:41:36 +0200 [thread overview]
Message-ID: <1537202496.3362.133.camel@pengutronix.de> (raw)
In-Reply-To: <20180917163627.14746-1-l.stach@pengutronix.de>
Am Montag, den 17.09.2018, 18:36 +0200 schrieb Lucas Stach:
> This is the default out-of-reset voltage, but if only the i.MX6 SoC
> got reset, the PMIC might still be stuck at the lower volatge for the
> slow operating point.
>
Please ignore, this patch is incomplete and I have a few more that
might fit into this series, so will resend later.
Regards,
Lucas
> Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
> ---
> arch/arm/boards/zii-imx6q-rdu2/board.c | 17 +++++++++++++++++
> 1 file changed, 17 insertions(+)
>
> diff --git a/arch/arm/boards/zii-imx6q-rdu2/board.c b/arch/arm/boards/zii-imx6q-rdu2/board.c
> index f6c908c9f16d..bce221bf8d20 100644
> --- a/arch/arm/boards/zii-imx6q-rdu2/board.c
> +++ b/arch/arm/boards/zii-imx6q-rdu2/board.c
> @@ -137,10 +137,27 @@ late_initcall(rdu2_enable_front_panel_usb);
>
> static int rdu2_devices_init(void)
> {
> > + struct i2c_client client;
> +
> > if (!of_machine_is_compatible("zii,imx6q-zii-rdu2") &&
> > !of_machine_is_compatible("zii,imx6qp-zii-rdu2"))
> > return 0;
>
> > + client.adapter = i2c_get_adapter(1);
> > + if (client.adapter) {
> > + u8 reg;
> +
> > + /*
> > + * Reset PMIC SW1AB and SW1C rails to 1.375V. If an event
> > + * caused only the i.MX6 SoC reset, the PMIC might still be
> > + * stuck on the low voltage for the slow operating point.
> > + */
> > + client.addr = 0x08; /* PMIC i2c address */
> > + reg = 0x2b; /* 1.375V, valid for both rails */
> > + i2c_write_reg(&client, 0x20, ®, 1);
> > + i2c_write_reg(&client, 0x2e, ®, 1);
> > + }
> +
> > barebox_set_hostname("rdu2");
>
> > imx6_bbu_internal_spi_i2c_register_handler("SPI", "/dev/m25p0.barebox",
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prev parent reply other threads:[~2018-09-17 16:41 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-17 16:36 Lucas Stach
2018-09-17 16:36 ` [PATCH 2/2] ARM: rdu2: configure the USB port as OTG Lucas Stach
2018-09-17 16:41 ` Lucas Stach [this message]
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