[PATCH V6 19/23] mmc: mmci: add optional reset property
From: Ludovic Barre <hidden>
Date: 2018-10-08 12:11:05
Also in:
linux-devicetree, linux-mmc, lkml
Subsystem:
arm primecell mmci pl180/1 driver, multimedia card (mmc), secure digital (sd) and sdio subsystem, the rest · Maintainers:
Russell King, Ulf Hansson, Linus Torvalds
From: Ludovic Barre <redacted> This patch adds a optional reset management. STM32 sdmmc variant needs to reset hardware block during the power cycle procedure (for re-initialization). Signed-off-by: Ludovic Barre <redacted> --- drivers/mmc/host/mmci.c | 7 +++++++ drivers/mmc/host/mmci.h | 2 ++ 2 files changed, 9 insertions(+)
diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index 7607599..d636a0e 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c@@ -36,6 +36,7 @@ #include <linux/pm_runtime.h> #include <linux/types.h> #include <linux/pinctrl/consumer.h> +#include <linux/reset.h> #include <asm/div64.h> #include <asm/io.h>
@@ -1882,6 +1883,12 @@ static int mmci_probe(struct amba_device *dev, dev_dbg(mmc_dev(mmc), "clocking block at %u Hz\n", mmc->f_max); + host->rst = devm_reset_control_get_optional_exclusive(&dev->dev, NULL); + if (IS_ERR(host->rst)) { + ret = PTR_ERR(host->rst); + goto clk_disable; + } + /* Get regulators and the supported OCR mask */ ret = mmc_regulator_get_supply(mmc); if (ret)
diff --git a/drivers/mmc/host/mmci.h b/drivers/mmc/host/mmci.h
index cdcadd2..8ecb1ee 100644
--- a/drivers/mmc/host/mmci.h
+++ b/drivers/mmc/host/mmci.h@@ -318,6 +318,8 @@ struct mmci_host { struct clk *clk; u8 singleirq:1; + struct reset_control *rst; + spinlock_t lock; unsigned int mclk;
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2.7.4