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mmc: host: renesas_sdhi_core: support selecting an optional mux

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Some hardware designs route data or control signals through a mux to
support multiple devices on a single sdhi controller.

In particular SolidRun RZ/G2L/G2LC/V2L System on Module use a mux for
switching between soldered eMMC and an optional microSD on a carrier
board, e.g. for development or provisioning.

SD/SDIO/eMMC are not well suited for runtime switching between different
cards, however boot-time selection is possible and useful - in
particular considering dt overlays.

Add support for an optional SD/SDIO/eMMC mux defined in dt, and select
it during probe.

Similar functionality already exists in other places, e.g. i2c-omap.

Signed-off-by: Josua Mayer <josua@solid-run.com>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Tested-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Josua Mayer
2026-02-26 15:21:17 +02:00
committed by Ulf Hansson
parent ce5c7c17e7
commit 3c080bb263
1 changed files with 6 additions and 0 deletions
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6
drivers/mmc/host/renesas_sdhi_core.c
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@@ -26,6 +26,7 @@
#include <linux/mmc/mmc.h>
#include <linux/mmc/slot-gpio.h>
#include <linux/module.h>
#include <linux/mux/consumer.h>
#include <linux/pinctrl/consumer.h>
#include <linux/pinctrl/pinctrl-state.h>
#include <linux/platform_data/tmio.h>
@@ -1062,6 +1063,7 @@ int renesas_sdhi_probe(struct platform_device *pdev,
struct regulator_dev *rdev;
struct renesas_sdhi_dma *dma_priv;
struct device *dev = &pdev->dev;
struct mux_state *mux_state;
struct tmio_mmc_host *host;
struct renesas_sdhi *priv;
int num_irqs, irq, ret, i;
@@ -1116,6 +1118,10 @@ int renesas_sdhi_probe(struct platform_device *pdev,
"state_uhs");
}
mux_state = devm_mux_state_get_optional_selected(&pdev->dev, NULL);
if (IS_ERR(mux_state))
return PTR_ERR(mux_state);
host = tmio_mmc_host_alloc(pdev, mmc_data);
if (IS_ERR(host))
return PTR_ERR(host);