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Mon, 6 Jul 2020 15:53:50 +0000 (GMT) From: "Alim Akhtar" To: "'Krzysztof Kozlowski'" In-Reply-To: <20200705182306.GA13827@kozik-lap> Subject: RE: [PATCH v1 2/2] arm64: dts: exynos: keep LDO12 always-on Date: Mon, 6 Jul 2020 21:23:49 +0530 Message-ID: <02e601d653ad$a5734190$f059c4b0$@samsung.com> MIME-Version: 1.0 X-Mailer: Microsoft Outlook 16.0 Thread-Index: AQJLYggk8ojyKiThj86cHLqsfdRQHAG6bdnCAyh2CO0B1MYKXqfa1vMg Content-Language: en-in X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFuplleLIzCtJLcpLzFFi42LZdlhTQ1fQkzneYOJZIYv5R86xWpw/v4Hd YtPja6wWl3fNYbOYcX4fk0Xr3iPsDmwem1Z1snlsXlLv8XmTXABzFJdNSmpOZllqkb5dAlfG mePL2Qo+8Ffs2LmXtYHxF08XIyeHhICJxP+2WUxdjFwcQgK7GSXWf7/GCOF8YpTYfOUpC4Tz jVHiUt9L9i5GDrCWnS2OEPG9jBLvbjUzQzhvGCUu/zjHDDKXTUBXYsfiNjYQWwTI3nxjOTtI EbPAckaJW79vsIBM4hTQl3jYHwFSIyzgIrG8Zx8jiM0ioCKx+8B+VhCbV8BS4v2zlSwQtqDE yZlPwGxmAW2JZQtfM0P8oCDx8+kyVohdbhK3dq9hhqgRlzj6swfsOAmBv+wS3TN2QzW4SMze 3McEYQtLvDq+hR3ClpJ42d8G9WW2RM8uY4hwjcTSecdYIGx7iQNX5oCdzyygKbF+lz7EKj6J 3t9PmCA6eSU62oQgqlUlmt9dheqUlpjY3c0KUeIhcaQtdQKj4iwkf81C8tcsJPfPQti1gJFl FaNkakFxbnpqsWmBYV5quV5xYm5xaV66XnJ+7iZGcIrR8tzBePfBB71DjEwcjIcYJTiYlUR4 e7UZ44V4UxIrq1KL8uOLSnNSiw8xSnOwKInzKv04EyckkJ5YkpqdmlqQWgSTZeLglGpgck4/ WVKqzFLVqym8bdG+I4JWy/Vf/z5noXCpxVHtxcyV/P1MvA8nB6offP7s2jHDKecynQ5npV11 vSA0dd/BnizDdmu9wrtOnncSD9qummwaqMic9GtTJfv5rIDnSdH+yjdc98l0cV/IX2rHdPLC vKSP8y33Luk6p/PBYMu6OaxbP7eyzUld5G551qNoxZHInguTQ2t25EpvjHht8fha7cLbLq0P A5l0eEOaU0S3ndvV3f41/PXFmRfWcRjVbvPZzsYgHrjDp6Tpbf2Hp5F7V61dI8bKOr21eev8 lY9nbWhmvrzaecvZAs8UY/5wp6PuXrUschtWn+d1nVxb6x0fuOTjJL6YwtASC9OHs0PblFiK MxINtZiLihMBitxqhKADAAA= X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFvrMLMWRmVeSWpSXmKPExsWy7bCSnK6AJ3O8wf0Huhbzj5xjtTh/fgO7 xabH11gtLu+aw2Yx4/w+JovWvUfYHdg8Nq3qZPPYvKTe4/MmuQDmKC6blNSczLLUIn27BK6M JSeesBdc5K/Y8PMecwPjTZ4uRg4OCQETiZ0tjl2MXBxCArsZJT7f/MTcxcgJFJeWuL5xAjuE LSyx8t9zdoiiV4wSu75/BytiE9CV2LG4jQ3EFgGyN99YDlbELLCaUeLvvT3MEB2PGCW2Xj/N CrKOU0Bf4mF/BEiDsICLxPKefYwgNouAisTuA/tZQWxeAUuJ989WskDYghInZz4Bs5kFtCWe 3nwKZy9b+BrqUgWJn0+XsUIc4SZxa/caZogacYmjP3uYJzAKz0IyahaSUbOQjJqFpGUBI8sq RsnUguLc9NxiwwLDvNRyveLE3OLSvHS95PzcTYzgeNHS3MG4fdUHvUOMTByMhxglOJiVRHh7 tRnjhXhTEiurUovy44tKc1KLDzFKc7AoifPeKFwYJySQnliSmp2aWpBaBJNl4uCUamCSSm9o DVUu8lS5t9x8Y7XhPHtOk8ztDFN3JFS8eTX34+63UjvdZl3kfs5/oFL1o0TvsZMOorLHHbwS TvxOvFizk/M4g8uKrHd6fIb/Vl28qtR/Zeatbh65HfU7H8fq7KzbHlEmqcbxz++QEZ+L9cPk w7/vHJ+7S0xcXrY1c/rEKHGrg69PMorGLqiTOyL+6Gp84bpPyReL7P5/Pye5pJ/vMcvbOSnL nq6s+iBVe3hauumpJpHa/6WJ3YE7U6Tnf3c8zntORSn28zfN/RMS69pWRJx4mv1wQmV4Nw/H NfkGyQsnp95h8VGwtWwX/FBQXHYz2Cqs+NmMdZM86nVZVP3+1HpePTHPYNMGU6YzTNVKLMUZ iYZazEXFiQDy7wpQBgMAAA== X-CMS-MailID: 20200706155352epcas5p1dda4df18c037960b6a326e077d7cec8f X-Msg-Generator: CA CMS-TYPE: 105P X-CMS-RootMailID: 20200705072938epcas5p479f0d040ca34fd44b2ba893a199efb79 References: <20200705070918.63531-1-alim.akhtar@samsung.com> <20200705070918.63531-2-alim.akhtar@samsung.com> <20200705182306.GA13827@kozik-lap> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200706_115359_233755_9A1E2EF2 X-CRM114-Status: GOOD ( 20.99 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: robh+dt@kernel.org, devicetree@vger.kernel.org, linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Krzysztof, > -----Original Message----- > From: Krzysztof Kozlowski > Sent: 05 July 2020 23:53 > To: Alim Akhtar > Cc: devicetree@vger.kernel.org; linux-arm-kernel@lists.infradead.org; linux- > samsung-soc@vger.kernel.org; linux-kernel@vger.kernel.org; > robh+dt@kernel.org > Subject: Re: [PATCH v1 2/2] arm64: dts: exynos: keep LDO12 always-on > > On Sun, Jul 05, 2020 at 12:39:18PM +0530, Alim Akhtar wrote: > > LDO12 on exynos7 supply power to VDDQ_UFS20_RESET, in case this > > regulator is OFF, UFS host controller can not send command to UFS > > device. To keep this supply ON, set regulator-always-on property for > > this ldo. > > Why UFS does not take any supplies? This looks like a workaround for the case > of not implementing any consumer. > This particular supply is not part of UFS HCI spec and binding documentation, as per binding only one supply for host controller and three others for UFS device are needed. My best guess is, VDDQ_UFS20_RESET supply to reset logic block inside HCI, which might be specific to this controller version (I did not find any such supply in the latest host controller though). > Best regards, > Krzysztof > > > > > > Signed-off-by: Alim Akhtar > > --- > > arch/arm64/boot/dts/exynos/exynos7-espresso.dts | 1 + > > 1 file changed, 1 insertion(+) > > > > diff --git a/arch/arm64/boot/dts/exynos/exynos7-espresso.dts > > b/arch/arm64/boot/dts/exynos/exynos7-espresso.dts > > index bb86950032d3..92fecc539c6c 100644 > > --- a/arch/arm64/boot/dts/exynos/exynos7-espresso.dts > > +++ b/arch/arm64/boot/dts/exynos/exynos7-espresso.dts > > @@ -194,6 +194,7 @@ > > regulator-min-microvolt = <1000000>; > > regulator-max-microvolt = <1300000>; > > regulator-enable-ramp-delay = <125>; > > + regulator-always-on; > > }; > > > > ldo13_reg: LDO13 { > > -- > > 2.17.1 > > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel