mmc: core: Use a struct device* as in-param to mmc_of_parse_clk_phase()

Parsing dt usually happens very early, sometimes even before the struct
mmc_host has been allocated (e.g. dw_mci_probe() and dw_mci_parse_dt() in
dw_mmc.c). Looking at the source of mmc_of_parse_clk_phase(), it's actually
not needed to have an initialized mmc_host, let's therefore pass a struct
device* to it instead.

Also update the only current user, sdhci-of-aspeed.

Reviewed-by: Paul Menzel <pmenzel@molgen.mpg.de>
Acked-by: Andrew Jeffery <andrew@codeconstruct.com.au>
Signed-off-by: Yang Xiwen <forbidden405@outlook.com>
Link: https://lore.kernel.org/r/20240229-b4-mmc-hi3798mv200-v7-1-10c03f316285@outlook.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

Author: 185264646

drivers/mmc/core/host.c

@@ -234,10 +234,8 @@ static void mmc_of_parse_timing_phase(struct device *dev, const char *prop,
 }
 
 void
-mmc_of_parse_clk_phase(struct mmc_host *host, struct mmc_clk_phase_map *map)
+mmc_of_parse_clk_phase(struct device *dev, struct mmc_clk_phase_map *map)
 {
-	struct device *dev = host->parent;
-
 	mmc_of_parse_timing_phase(dev, "clk-phase-legacy",
 				  &map->phase[MMC_TIMING_LEGACY]);
 	mmc_of_parse_timing_phase(dev, "clk-phase-mmc-hs",

drivers/mmc/host/sdhci-of-aspeed.c

@@ -435,7 +435,7 @@ static int aspeed_sdhci_probe(struct platform_device *pdev)
 		goto err_sdhci_add;
 
 	if (dev->phase_desc)
-		mmc_of_parse_clk_phase(host->mmc, &dev->phase_map);
+		mmc_of_parse_clk_phase(&pdev->dev, &dev->phase_map);
 
 	ret = sdhci_add_host(host);
 	if (ret)

include/linux/mmc/host.h

@@ -539,7 +539,7 @@ struct mmc_host *devm_mmc_alloc_host(struct device *dev, int extra);
 int mmc_add_host(struct mmc_host *);
 void mmc_remove_host(struct mmc_host *);
 void mmc_free_host(struct mmc_host *);
-void mmc_of_parse_clk_phase(struct mmc_host *host,
+void mmc_of_parse_clk_phase(struct device *dev,
 			    struct mmc_clk_phase_map *map);
 int mmc_of_parse(struct mmc_host *host);
 int mmc_of_parse_voltage(struct mmc_host *host, u32 *mask);