linux-kernel - [PATCH] mmc: host: replace 1st argument to struct device * for mmc_of_parse_clk

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Message-Id: <20240215-mmc_phase-v1-1-f27644ee13e4@outlook.com>
Date: Thu, 15 Feb 2024 19:03:38 +0800
From: Yang Xiwen via B4 Relay <devnull+forbidden405.outlook.com@...nel.org>
To: Ulf Hansson <ulf.hansson@...aro.org>, 
 Andrew Jeffery <andrew@...econstruct.com.au>, 
 Adrian Hunter <adrian.hunter@...el.com>, Joel Stanley <joel@....id.au>
Cc: linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-aspeed@...ts.ozlabs.org, openbmc@...ts.ozlabs.org, 
 linux-arm-kernel@...ts.infradead.org, Yang Xiwen <forbidden405@...look.com>
Subject: [PATCH] mmc: host: replace 1st argument to struct device * for
 mmc_of_parse_clk_phase()

From: Yang Xiwen <forbidden405@...look.com>

Parsing dt usaully happens very early, sometimes even bofore struct
mmc_host is 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 mandatory to have a initialized mmc_host first, instead we
can pass struct device * to it directly.

Also fix the only current user (sdhci-of-aspeed.c).

Signed-off-by: Yang Xiwen <forbidden405@...look.com>
---
 drivers/mmc/core/host.c            | 4 +---
 drivers/mmc/host/sdhci-of-aspeed.c | 2 +-
 include/linux/mmc/host.h           | 2 +-
 3 files changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c
index cf396e8f34e9..8b2844ac5dc5 100644
--- a/drivers/mmc/core/host.c
+++ b/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",
diff --git a/drivers/mmc/host/sdhci-of-aspeed.c b/drivers/mmc/host/sdhci-of-aspeed.c
index 42d54532cabe..430c1f90037b 100644
--- a/drivers/mmc/host/sdhci-of-aspeed.c
+++ b/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)
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index 2f445c651742..5894bf912f7b 100644
--- a/include/linux/mmc/host.h
+++ b/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);

---
base-commit: 9d64bf433c53cab2f48a3fff7a1f2a696bc5229a
change-id: 20240215-mmc_phase-26e85511285d

Best regards,
-- 
Yang Xiwen <forbidden405@...look.com>