From: Markus Pargmann Date: Tue, 24 Mar 2015 15:26:18 +0000 (+0100) Subject: pinctrl: fsl: imx: Check for 0 config register X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=16837f9588819c06469e635c04a8135f98ab9ae6;p=linux-beck.git pinctrl: fsl: imx: Check for 0 config register 0 is used in all pinfunction definitions when a config register is not available, for example imx25-pinfunc.h. If a configuration value is used for such a pinfunction the driver will always write it to the configuration register if it is not -1. For a 0 configuration register the configuration value is written to offset 0x0. This can lead to a crashing/hanging system without any warning message. This patch checks for 0 config register and sets the internal value to -1. If the configuration value is not NO_PADCTL this leads to an error message that applying the configuration failed. Signed-off-by: Markus Pargmann Acked-by: Uwe Kleine-König Tested-by: Stefan Agner Acked-by: Stefan Agner Signed-off-by: Linus Walleij --- diff --git a/drivers/pinctrl/freescale/pinctrl-imx.c b/drivers/pinctrl/freescale/pinctrl-imx.c index 2ee0d9228e63..e261f1cf85c6 100644 --- a/drivers/pinctrl/freescale/pinctrl-imx.c +++ b/drivers/pinctrl/freescale/pinctrl-imx.c @@ -542,10 +542,13 @@ static int imx_pinctrl_parse_groups(struct device_node *np, struct imx_pin_reg *pin_reg; struct imx_pin *pin = &grp->pins[i]; - if (info->flags & SHARE_MUX_CONF_REG) + if (info->flags & SHARE_MUX_CONF_REG) { conf_reg = mux_reg; - else + } else { conf_reg = be32_to_cpu(*list++); + if (!conf_reg) + conf_reg = -1; + } pin_id = mux_reg ? mux_reg / 4 : conf_reg / 4; pin_reg = &info->pin_regs[pin_id];