[PATCH V6 20/23] mmc: mmci: add clock divider for stm32 sdmmc
From: Ludovic Barre <hidden>
Date: 2018-10-08 12:12:08
Also in:
linux-devicetree, linux-mmc, lkml
Subsystem:
arm primecell mmci pl180/1 driver, multimedia card (mmc), secure digital (sd) and sdio subsystem, the rest · Maintainers:
Russell King, Ulf Hansson, Linus Torvalds
From: Ludovic Barre <redacted> The STM32 sdmmc variant has a different clock divider. Signed-off-by: Ludovic Barre <redacted> --- 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;
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2.7.4