From mboxrd@z Thu Jan 1 00:00:00 1970 From: Yangbo Lu Subject: [v3, 0/7] Add SD UHS-I and eMMC HS200 support for eSDHC Date: Mon, 27 Mar 2017 15:49:35 +0800 Message-ID: <1490600982-5410-1-git-send-email-yangbo.lu@nxp.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=m.gmane.org@lists.infradead.org To: linux-mmc@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, ulf.hansson@linaro.org, Adrian Hunter , Rob Herring , Mark Rutland , Catalin Marinas , Will Deacon Cc: Xiaobo Xie , Yangbo Lu List-Id: devicetree@vger.kernel.org It's complicated to support SD UHS-I and eMMC HS200 for eSDHC because there're many differences between eSDHC and SD/eMMC spec. Several differences as below must be considered: 1. Peripheral clock must be used instead of platform clock. - eSDHC could select peripheral clock or platform clock as its clock source. According to RM, UHS-I/HS200 must use peripheral clock since it supports higher frequency than platform clock. - Patch 1 and patch 6 is to support this. 2. Signal voltage switching requires a control circuit out of eSDHC. - eSDHC supports signal voltage switch from 3.3v to 1.8v by eSDHC_PROCTL[VOLT_SEL] bit. This bit changes the value of output signal SDHC_VS, and there must be a control circuit out of eSDHC to change the signal voltage according to SDHC_VS output signal. - Patch 2 is to support this. 3. eSDHC uses tuning block for tuning procedure. - Tuning clock control register must be configured before tuning. - Patch 3 is to support this. 4. Delay is needed between tuning cycles for HS200 tuning. - Once a patch removed mdelay between tuning cycles. But eSDHC needs it. - Patch 4 and patch 5 is to support this. 5. UHS-I/HS200 modes could be enabled in dts node. - Patch 7 is to support this. Please review and merge these patches on mmc git tree if no changes are required. Adrian Hunter (1): mmc: sdhci: Control the delay between tuning commands Yangbo Lu (6): mmc: sdhci-of-esdhc: add peripheral clock support mmc: sdhci-of-esdhc: add support for signal voltage switch mmc: sdhci-of-esdhc: add tuning support mmc: sdhci-of-esdhc: add delay between tuning cycles arm64: dts: ls1046a: add clocks property and compatible for eSDHC node arm64: dts: ls1046ardb: add MMC HS200/UHS-1 modes support arch/arm64/boot/dts/freescale/fsl-ls1046a-rdb.dts | 8 ++ arch/arm64/boot/dts/freescale/fsl-ls1046a.dtsi | 3 +- drivers/mmc/host/sdhci-esdhc.h | 7 + drivers/mmc/host/sdhci-of-esdhc.c | 165 +++++++++++++++++++++- drivers/mmc/host/sdhci.c | 11 +- drivers/mmc/host/sdhci.h | 2 + 6 files changed, 190 insertions(+), 6 deletions(-) -- 2.1.0.27.g96db324