From: Sreedhar Sambangi <ssambang@codeaurora.org>
To: Andy Gross <andy.gross@linaro.org>
Cc: devicetree@vger.kernel.org, linux-arm-msm@vger.kernel.org,
david.brown@linaro.org, robh+dt@kernel.org, pawel.moll@arm.com,
mark.rutland@arm.com, ijc+devicetree@hellion.org.uk,
galak@codeaurora.org, linux@arm.linux.org.uk,
linux-soc@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org,
qca-upstream.external@qca.qualcomm.com
Subject: Re: [PATCH 1/2] qcom: ipq4019: Add regulator support to DK04 device tree
Date: Tue, 05 Apr 2016 21:55:07 -0700 [thread overview]
Message-ID: <a15ae971ac4105d0f9e9e74a7cf0f50b@codeaurora.org> (raw)
In-Reply-To: <20160405055906.GB2639@hector>
On 2016-04-04 22:59, Andy Gross wrote:
> On Mon, Apr 04, 2016 at 02:08:10PM -0700, Sreedhar Sambangi wrote:
>> This adds the regulator nodes to DK04 device tree to support
>>
>> Change-Id: I9c1df0e720a330bf6db1889fd2247f6a70ea6faa
>> Signed-off-by: Sreedhar Sambangi <ssambang@codeaurora.org>
>> ---
>> .../bindings/regulator/ipq4019-regulator.txt | 19
>> +++++++++++++++++++
>> arch/arm/boot/dts/qcom-ipq4019-ap.dk04.1.dtsi | 11
>> +++++++++++
>> 2 files changed, 30 insertions(+)
>> create mode 100644
>> Documentation/devicetree/bindings/regulator/ipq4019-regulator.txt
>>
>> diff --git
>> a/Documentation/devicetree/bindings/regulator/ipq4019-regulator.txt
>> b/Documentation/devicetree/bindings/regulator/ipq4019-regulator.txt
>> new file mode 100644
>> index 0000000..9d934a4
>> --- /dev/null
>> +++
>> b/Documentation/devicetree/bindings/regulator/ipq4019-regulator.txt
>> @@ -0,0 +1,19 @@
>> +* Qualcomm Technologies, Inc. IPQ4019 regulators
>> +
>> +Required properties:
>> +- compatible : Must be "regulator-ipq4019".
>> +- states : Selection of available voltages and corresponding values
>> +- reg : Register address for controlling LDO
>> +- mask : Mask value for switching voltages
>> +Example:
>
> How many LDOs are there on the IPQ4019? Can you document all of the
> supplies?
> You can figure this out by looking for the vdd pins in the chip
> documentation
>
In this Chip , We only have one Software programmable LDO used for SD
/eMMC. The other LDO's are with fixed voltage.
>> +
>> + vccq_sd0: regulator@0 {
>> + compatible = "qcom,regulator-ipq4019";
>> + regulator-name = "SD0 VccQ";
>> + regulator-min-microvolt = <1800000>;
>> + regulator-max-microvolt = <3000000>;
>> + states = <3000000 0x3
>> + 1800000 0x1>;
>
> So there are only 2 states? No linear range from 1.8 to 3.3?
Currently this LDO can support [1.5, 1.8, 2.5 and 3] but for the SD /
eMMC scenario, we use only two states.
>
>> + reg = <0x01948000 0x4>;
>> + mask = <0x3>;
>> + };
--
-Sree
next prev parent reply other threads:[~2016-04-06 4:55 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-04 21:08 [PATCH 1/2] qcom: ipq4019: Add regulator support to DK04 device tree Sreedhar Sambangi
2016-04-05 5:59 ` Andy Gross
2016-04-06 4:55 ` Sreedhar Sambangi [this message]
2016-04-07 17:57 ` Rob Herring
2016-04-07 18:11 ` Andy Gross
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