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mmc: sdhci-of-k1: add reset support

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The SDHCI controller of SpacemiT K1 SoC requires two resets, add
support to explicitly request the reset line and deassert during
initialization phase. Still using devm_xx_get_optional() API to
make the request optional.

Signed-off-by: Yixun Lan <dlan@gentoo.org>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Yixun Lan 2025-12-23 10:24:50 +08:00 committed by Ulf Hansson
parent 4231325cfb
commit 658b716c04
1 changed files with 20 additions and 0 deletions
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20
drivers/mmc/host/sdhci-of-k1.c
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@ -15,6 +15,7 @@
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/reset.h>
#include <linux/platform_device.h>
#include "sdhci.h"
@ -223,6 +224,21 @@ static inline int spacemit_sdhci_get_clocks(struct device *dev,
return 0;
}
static inline int spacemit_sdhci_get_resets(struct device *dev)
{
struct reset_control *rst;
rst = devm_reset_control_get_optional_shared_deasserted(dev, "axi");
if (IS_ERR(rst))
return PTR_ERR(rst);
rst = devm_reset_control_get_optional_exclusive_deasserted(dev, "sdh");
if (IS_ERR(rst))
return PTR_ERR(rst);
return 0;
}
static const struct sdhci_ops spacemit_sdhci_ops = {
.get_max_clock = spacemit_sdhci_clk_get_max_clock,
.reset = spacemit_sdhci_reset,
@ -284,6 +300,10 @@ static int spacemit_sdhci_probe(struct platform_device *pdev)
if (ret)
goto err_pltfm;
ret = spacemit_sdhci_get_resets(dev);
if (ret)
goto err_pltfm;
ret = sdhci_add_host(host);
if (ret)
goto err_pltfm;