[PATCH 16/19] mmc: mmci: add DT bindings for STM32 sdmmc
From: Ludovic Barre <hidden>
Date: 2018-06-12 13:18:06
Also in:
linux-devicetree, linux-mmc, lkml
Subsystem:
arm primecell mmci pl180/1 driver, multimedia card (mmc), secure digital (sd) and sdio subsystem, open firmware and flattened device tree bindings, the rest · Maintainers:
Russell King, Ulf Hansson, Rob Herring, Krzysztof Kozlowski, Conor Dooley, Linus Torvalds
From: Ludovic Barre <redacted> 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 <redacted> --- 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