linux-kernel - [PATCH V6 20/23] mmc: mmci: add clock divider for stm32 sdmmc

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Date:   Mon, 8 Oct 2018 14:08:52 +0200
From:   Ludovic Barre <ludovic.Barre@...com>
To:     Ulf Hansson <ulf.hansson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>
CC:     <srinivas.kandagatla@...aro.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-mmc@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        Ludovic Barre <ludovic.barre@...com>
Subject: [PATCH V6 20/23] mmc: mmci: add clock divider for stm32 sdmmc

From: Ludovic Barre <ludovic.barre@...com>

The STM32 sdmmc variant has a different clock divider.

Signed-off-by: Ludovic Barre <ludovic.barre@...com>
---
 drivers/mmc/host/mmci.c | 2 ++
 drivers/mmc/host/mmci.h | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index d636a0e..ad2f62f 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -1862,6 +1862,8 @@ static int mmci_probe(struct amba_device *dev,
 	 */
 	if (variant->st_clkdiv)
 		mmc->f_min = DIV_ROUND_UP(host->mclk, 257);
+	else if (variant->stm32_clkdiv)
+		mmc->f_min = DIV_ROUND_UP(host->mclk, 2046);
 	else if (variant->explicit_mclk_control)
 		mmc->f_min = clk_round_rate(host->clk, 100000);
 	else
diff --git a/drivers/mmc/host/mmci.h b/drivers/mmc/host/mmci.h
index 8ecb1ee..a962cfa 100644
--- a/drivers/mmc/host/mmci.h
+++ b/drivers/mmc/host/mmci.h
@@ -216,6 +216,7 @@ struct mmci_host;
  * @data_cmd_enable: enable value for data commands.
  * @st_sdio: enable ST specific SDIO logic
  * @st_clkdiv: true if using a ST-specific clock divider algorithm
+ * @stm32_clkdiv: true if using a STM32-specific clock divider algorithm
  * @datactrl_mask_ddrmode: ddr mode mask in datactrl register.
  * @blksz_datactrl16: true if Block size is at b16..b30 position in datactrl register
  * @blksz_datactrl4: true if Block size is at b4..b16 position in datactrl
@@ -269,6 +270,7 @@ struct variant_data {
 	u8			datacnt_useless:1;
 	u8			st_sdio:1;
 	u8			st_clkdiv:1;
+	u8			stm32_clkdiv:1;
 	u8			blksz_datactrl16:1;
 	u8			blksz_datactrl4:1;
 	u32			pwrreg_powerup;
-- 
2.7.4