linux-kernel - [PATCH 16/19] mmc: mmci: add DT bindings for STM32 sdmmc

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Message-ID: <1528809280-31116-17-git-send-email-ludovic.Barre@st.com>
Date:   Tue, 12 Jun 2018 15:14:37 +0200
From:   Ludovic Barre <ludovic.Barre@...com>
To:     Ulf Hansson <ulf.hansson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>
CC:     Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Gerald Baeza <gerald.baeza@...com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-mmc@...r.kernel.org>, Ludovic Barre <ludovic.barre@...com>
Subject: [PATCH 16/19] mmc: mmci: add DT bindings for STM32 sdmmc

From: Ludovic Barre <ludovic.barre@...com>

STM32 sdmmc variant has support to:
-Indicate signal directions (only one property
for d0dir, d123dir, cmd_dir)
-Select command and data phase relation.
-Select "clock in" from an external driver.

Signed-off-by: Ludovic Barre <ludovic.barre@...com>
---
 Documentation/devicetree/bindings/mmc/mmci.txt | 9 +++++++++
 drivers/mmc/host/mmci.c                        | 6 ++++++
 2 files changed, 15 insertions(+)

diff --git a/Documentation/devicetree/bindings/mmc/mmci.txt b/Documentation/devicetree/bindings/mmc/mmci.txt
index e952707..d678933 100644
--- a/Documentation/devicetree/bindings/mmc/mmci.txt
+++ b/Documentation/devicetree/bindings/mmc/mmci.txt
@@ -19,6 +19,7 @@ Optional properties:
                            the ID provided by the HW
 - vqmmc-supply           : phandle to the regulator device tree node, mentioned
                            as the VCCQ/VDD_IO supply in the eMMC/SD specs.
+specific for ux500 variant:
 - st,sig-dir-dat0        : bus signal direction pin used for DAT[0].
 - st,sig-dir-dat2        : bus signal direction pin used for DAT[2].
 - st,sig-dir-dat31       : bus signal direction pin used for DAT[3] and DAT[1].
@@ -26,6 +27,14 @@ Optional properties:
 - st,sig-dir-cmd         : cmd signal direction pin used for CMD.
 - st,sig-pin-fbclk       : feedback clock signal pin used.
 
+specific for sdmmc variant:
+- st,sig-dir             : signal direction polarity used for cmd, dat0 dat123.
+- st,neg-edge            : data & command phase relation, generated on
+                           sd clock falling edge.
+- st,use-ckin            : use ckin pin from an external driver to sample
+                           the receive data (example: with voltage
+			   switch transceiver).
+
 Deprecated properties:
 - mmc-cap-mmc-highspeed  : indicates whether MMC is high speed capable.
 - mmc-cap-sd-highspeed   : indicates whether SD is high speed capable.
diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index e24fd1e..86aef4f 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -1328,6 +1328,12 @@ static int mmci_of_parse(struct device_node *np, struct mmc_host *mmc)
 		host->pwr_reg_add |= MCI_ST_CMDDIREN;
 	if (of_get_property(np, "st,sig-pin-fbclk", NULL))
 		host->pwr_reg_add |= MCI_ST_FBCLKEN;
+	if (of_get_property(np, "st,sig-dir", NULL))
+		host->pwr_reg_add |= MCI_STM32_DIRPOL;
+	if (of_get_property(np, "st,neg-edge", NULL))
+		host->clk_reg_add |= MCI_STM32_CLK_NEGEDGE;
+	if (of_get_property(np, "st,use-ckin ", NULL))
+		host->clk_reg_add |= MCI_STM32_CLK_SELCKIN;
 
 	if (of_get_property(np, "mmc-cap-mmc-highspeed", NULL))
 		mmc->caps |= MMC_CAP_MMC_HIGHSPEED;
-- 
2.7.4