From: Steven Lee <steven_lee@aspeedtech.com>
To: Andrew Jeffery <andrew@aj.id.au>
Cc: Philipp Zabel <p.zabel@pengutronix.de>,
Ulf Hansson <ulf.hansson@linaro.org>,
Rob Herring <robh+dt@kernel.org>, Joel Stanley <joel@jms.id.au>,
Adrian Hunter <adrian.hunter@intel.com>,
Ryan Chen <ryanchen.aspeed@gmail.com>,
"moderated list:ASPEED SD/MMC DRIVER"
<linux-aspeed@lists.ozlabs.org>,
"moderated list:ASPEED SD/MMC DRIVER" <openbmc@lists.ozlabs.org>,
linux-mmc <linux-mmc@vger.kernel.org>,
"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
<devicetree@vger.kernel.org>,
"moderated list:ARM/ASPEED MACHINE SUPPORT"
<linux-arm-kernel@lists.infradead.org>,
open list <linux-kernel@vger.kernel.org>,
Hongwei Zhang <Hongweiz@ami.com>,
Ryan Chen <ryan_chen@aspeedtech.com>,
Chin-Ting Kuo <chin-ting_kuo@aspeedtech.com>
Subject: Re: [PATCH v3 5/5] mmc: sdhci-of-aspeed: Assert/Deassert reset signal before probing eMMC
Date: Fri, 7 May 2021 14:24:17 +0800 [thread overview]
Message-ID: <20210507062416.GD23749@aspeedtech.com> (raw)
In-Reply-To: <19a81e25-dfa1-4ad3-9628-19f43f4230d2@www.fastmail.com>
The 05/07/2021 09:32, Andrew Jeffery wrote:
>
>
> On Thu, 6 May 2021, at 19:54, Philipp Zabel wrote:
> > Hi Steven,
> >
> > On Thu, May 06, 2021 at 06:03:12PM +0800, Steven Lee wrote:
> > > + if (info) {
> > > + if (info->flag & PROBE_AFTER_ASSET_DEASSERT) {
> > > + sdc->rst = devm_reset_control_get(&pdev->dev, NULL);
> >
> > Please use devm_reset_control_get_exclusive() or
> > devm_reset_control_get_optional_exclusive().
> >
> > > + if (!IS_ERR(sdc->rst)) {
> >
> > Please just return errors here instead of ignoring them.
> > The reset_control_get_optional variants return NULL in case the
> > device node doesn't contain a resets phandle, in case you really
> > consider this reset to be optional even though the flag is set?
>
> It feels like we should get rid of the flag and leave it to the
> devicetree.
>
Do you mean adding a flag, for instance, "mmc-reset" in the
device tree and call of_property_read_bool() in aspeed_sdc_probe()?
> I'm still kind of surprised it's not something we want to do for the
> 2400 and 2500 as well.
>
Per discussion with the chip designer, AST2400 and AST2500 doesn't need
this implementation since the chip design is different to AST2600.
> Andrew
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next prev parent reply other threads:[~2021-05-07 6:27 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-06 10:03 [PATCH v3 0/5] mmc: sdhci-of-aspeed: Support toggling SD bus signal Steven Lee
2021-05-06 10:03 ` [PATCH v3 1/5] dt-bindings: mmc: sdhci-of-aspeed: Add an example for AST2600-A2 EVB Steven Lee
2021-05-07 1:13 ` Rob Herring
2021-05-07 3:13 ` Steven Lee
2021-05-07 17:21 ` Rob Herring
2021-05-10 2:32 ` Steven Lee
2021-05-06 10:03 ` [PATCH v3 2/5] ARM: dts: aspeed: ast2600evb: Add comment for gpio regulator of sdhci Steven Lee
2021-05-07 1:40 ` Andrew Jeffery
2021-05-07 3:30 ` Steven Lee
2021-05-07 3:42 ` Andrew Jeffery
2021-05-06 10:03 ` [PATCH v3 3/5] ARM: dts: aspeed: ast2600evb: Add phase correction for emmc controller Steven Lee
2021-05-07 1:34 ` Andrew Jeffery
2021-05-06 10:03 ` [PATCH v3 4/5] mmc: sdhci-of-aspeed: Add a helper for updating capability register Steven Lee
2021-05-07 2:13 ` Andrew Jeffery
2021-05-07 6:59 ` Steven Lee
2021-05-07 7:07 ` Andrew Jeffery
2021-05-06 10:03 ` [PATCH v3 5/5] mmc: sdhci-of-aspeed: Assert/Deassert reset signal before probing eMMC Steven Lee
2021-05-06 10:24 ` Philipp Zabel
2021-05-07 1:32 ` Andrew Jeffery
2021-05-07 6:24 ` Steven Lee [this message]
2021-05-07 7:36 ` Andrew Jeffery
2021-05-10 6:03 ` Steven Lee
2021-05-13 0:42 ` Andrew Jeffery
2021-05-14 2:09 ` Steven Lee
2021-05-14 2:37 ` Andrew Jeffery
2021-05-19 10:57 ` Steven Lee
2021-05-19 23:09 ` Andrew Jeffery
2021-05-07 6:02 ` Steven Lee
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