diff mbox series

[1/2] mmc: core: add helpers mmc_regulator_enable/disable_vqmmc

Message ID 71586432-360f-9b92-17f6-b05a8a971bc2@gmail.com
State New
Headers show
Series mmc: add and use helpers mmc_regulator_enable/disable_vqmmc | expand

Commit Message

Heiner Kallweit March 11, 2023, 10:39 p.m. UTC 
There's a number of drivers (e.g. dw_mmc, meson-gx, mmci, sunxi) using
the same mechanism and a private flag vqmmc_enabled to deal with
enabling/disabling the vqmmc regulator.

Move this to the core and create new helpers mmc_regulator_enable_vqmmc
and mmc_regulator_disable_vqmmc.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
---
 drivers/mmc/core/regulator.c | 41 ++++++++++++++++++++++++++++++++++++
 include/linux/mmc/host.h     |  3 +++
 2 files changed, 44 insertions(+)

Comments

Martin Blumenstingl March 12, 2023, 8:28 p.m. UTC | #1 
On Sat, Mar 11, 2023 at 11:41 PM Heiner Kallweit <hkallweit1@gmail.com> wrote:
>
> There's a number of drivers (e.g. dw_mmc, meson-gx, mmci, sunxi) using
> the same mechanism and a private flag vqmmc_enabled to deal with
> enabling/disabling the vqmmc regulator.
>
> Move this to the core and create new helpers mmc_regulator_enable_vqmmc
> and mmc_regulator_disable_vqmmc.
>
> Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Acked-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
diff mbox series

Patch

diff --git a/drivers/mmc/core/regulator.c b/drivers/mmc/core/regulator.c
index 4fad81cd5..005247a49 100644
--- a/drivers/mmc/core/regulator.c
+++ b/drivers/mmc/core/regulator.c
@@ -274,3 +274,44 @@  int mmc_regulator_get_supply(struct mmc_host *mmc)
 	return 0;
 }
 EXPORT_SYMBOL_GPL(mmc_regulator_get_supply);
+
+/**
+ * mmc_regulator_enable_vqmmc - enable VQMMC regulator for a host
+ * @mmc: the host to regulate
+ *
+ * Returns 0 or errno. Enables the regulator for vqmmc.
+ * Keeps track of the enable status for ensuring that calls to
+ * regulator_enable/disable are balanced.
+ */
+int mmc_regulator_enable_vqmmc(struct mmc_host *mmc)
+{
+	int ret = 0;
+
+	if (!IS_ERR(mmc->supply.vqmmc) && !mmc->vqmmc_enabled) {
+		ret = regulator_enable(mmc->supply.vqmmc);
+		if (ret < 0)
+			dev_err(mmc_dev(mmc), "enabling vqmmc regulator failed\n");
+		else
+			mmc->vqmmc_enabled = true;
+	}
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(mmc_regulator_enable_vqmmc);
+
+/**
+ * mmc_regulator_disable_vqmmc - disable VQMMC regulator for a host
+ * @mmc: the host to regulate
+ *
+ * Returns 0 or errno. Disables the regulator for vqmmc.
+ * Keeps track of the enable status for ensuring that calls to
+ * regulator_enable/disable are balanced.
+ */
+void mmc_regulator_disable_vqmmc(struct mmc_host *mmc)
+{
+	if (!IS_ERR(mmc->supply.vqmmc) && mmc->vqmmc_enabled) {
+		regulator_disable(mmc->supply.vqmmc);
+		mmc->vqmmc_enabled = false;
+	}
+}
+EXPORT_SYMBOL_GPL(mmc_regulator_disable_vqmmc);
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index 812e6b583..461d15438 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -450,6 +450,7 @@  struct mmc_host {
 	unsigned int		retune_paused:1; /* re-tuning is temporarily disabled */
 	unsigned int		retune_crc_disable:1; /* don't trigger retune upon crc */
 	unsigned int		can_dma_map_merge:1; /* merging can be used */
+	unsigned int		vqmmc_enabled:1; /* vqmmc regulator is enabled */
 
 	int			rescan_disable;	/* disable card detection */
 	int			rescan_entered;	/* used with nonremovable devices */
@@ -598,6 +599,8 @@  static inline int mmc_regulator_set_vqmmc(struct mmc_host *mmc,
 #endif
 
 int mmc_regulator_get_supply(struct mmc_host *mmc);
+int mmc_regulator_enable_vqmmc(struct mmc_host *mmc);
+void mmc_regulator_disable_vqmmc(struct mmc_host *mmc);
 
 static inline int mmc_card_is_removable(struct mmc_host *host)
 {