[PATCH 1/2] ARM: rdu2: config PMIC SW1AB and SW1C rails to 1.375

Lucas Stach l.stach at pengutronix.de
Mon Sep 17 09:41:36 PDT 2018


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 at 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, &reg, 1);
> > +		i2c_write_reg(&client, 0x2e, &reg, 1);
> > +	}
> +
> >  	barebox_set_hostname("rdu2");
>  
> >  	imx6_bbu_internal_spi_i2c_register_handler("SPI", "/dev/m25p0.barebox",



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