Add code for configuring the MMC0CKCR/MMC1CKCR on Gen2 platforms.
This allows the MMCIF driver to set higher clock rate if desired.
Signed-off-by: Marek Vasut <marek.vasut+rene...@gmail.com>
Cc: Nobuhiro Iwamatsu <iwama...@nigauri.org>
---
drivers/clk/renesas/clk-rcar-gen2.c | 42 +++++++++++++++++++++++++++++
1 file changed, 42 insertions(+)
diff --git a/drivers/clk/renesas/clk-rcar-gen2.c
b/drivers/clk/renesas/clk-rcar-gen2.c
index 34abe784fd..13111b341a 100644
--- a/drivers/clk/renesas/clk-rcar-gen2.c
+++ b/drivers/clk/renesas/clk-rcar-gen2.c
@@ -206,8 +206,50 @@ static ulong gen2_clk_get_rate(struct clk *clk)
return -ENOENT;
}
+static int gen2_clk_setup_mmcif_div(struct clk *clk, ulong rate)
+{
+ struct gen2_clk_priv *priv = dev_get_priv(clk->dev);
+ struct cpg_mssr_info *info = priv->info;
+ const struct cpg_core_clk *core;
+ struct clk parent, pparent;
+ u32 val;
+ int ret;
+
+ ret = renesas_clk_get_parent(clk, info, &parent);
+ if (ret) {
+ debug("%s[%i] parent fail, ret=%i\n", __func__, __LINE__, ret);
+ return ret;
+ }
+
+ if (renesas_clk_is_mod(&parent))
+ return 0;
+
+ ret = renesas_clk_get_core(&parent, info, &core);
+ if (ret)
+ return ret;
+
+ if (strcmp(core->name, "mmc0") && strcmp(core->name, "mmc1"))
+ return 0;
+
+ ret = renesas_clk_get_parent(&parent, info, &pparent);
+ if (ret) {
+ debug("%s[%i] parent fail, ret=%i\n", __func__, __LINE__, ret);
+ return ret;
+ }
+
+ val = (gen2_clk_get_rate(&pparent) / rate) - 1;
+
+ debug("%s[%i] MMCIF offset=%x\n", __func__, __LINE__, core->offset);
+
+ writel(val, priv->base + core->offset);
+
+ return 0;
+}
+
static ulong gen2_clk_set_rate(struct clk *clk, ulong rate)
{
+ /* Force correct MMC-IF divider configuration if applicable */
+ gen2_clk_setup_mmcif_div(clk, rate);
return gen2_clk_get_rate(clk);
}
--
2.20.1
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