From patchwork Tue Jun 23 05:29:42 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bin Meng X-Patchwork-Id: 242781 List-Id: U-Boot discussion From: bmeng.cn at gmail.com (Bin Meng) Date: Mon, 22 Jun 2020 22:29:42 -0700 Subject: [PATCH 1/5] sysreset: syscon: Don't assume default value for offset and mask property Message-ID: <1592890186-18082-1-git-send-email-bmeng.cn@gmail.com> From: Bin Meng Per the DT binding, is a required property. Let's abort the probe if it is missing. For the property, current codes assume a default value of zero, which is not correct either. Signed-off-by: Bin Meng Reviewed-by: Simon Glass Reviewed-by: Pragnesh Patel --- drivers/sysreset/sysreset_syscon.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) diff --git a/drivers/sysreset/sysreset_syscon.c b/drivers/sysreset/sysreset_syscon.c index f64701a..caf2482 100644 --- a/drivers/sysreset/sysreset_syscon.c +++ b/drivers/sysreset/sysreset_syscon.c @@ -41,6 +41,7 @@ static struct sysreset_ops syscon_reboot_ops = { int syscon_reboot_probe(struct udevice *dev) { struct syscon_reboot_priv *priv = dev_get_priv(dev); + int err; priv->regmap = syscon_regmap_lookup_by_phandle(dev, "regmap"); if (IS_ERR(priv->regmap)) { @@ -48,8 +49,17 @@ int syscon_reboot_probe(struct udevice *dev) return -ENODEV; } - priv->offset = dev_read_u32_default(dev, "offset", 0); - priv->mask = dev_read_u32_default(dev, "mask", 0); + err = dev_read_u32(dev, "offset", &priv->offset); + if (err) { + pr_err("unable to find offset\n"); + return -ENOENT; + } + + err = dev_read_u32(dev, "mask", &priv->mask); + if (err) { + pr_err("unable to find mask\n"); + return -ENOENT; + } return 0; }