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authorPhilipp Zabel <p.zabel@pengutronix.de>2016-01-04 18:36:42 +0100
committerPhilipp Zabel <p.zabel@pengutronix.de>2016-05-06 17:47:39 +0200
commit06445994fece2ae458419fbadc1b2107336615d6 (patch)
treedb5614908e08c10419292a78936d0938e4ae7d89
parent9e629c17aa8d7a75b8c1d99ed42892cd8ba7cdc4 (diff)
downloadlinux-06445994fece2ae458419fbadc1b2107336615d6.tar.bz2
clk: mediatek: make dpi0_sel propagate rate changes
This mux is supposed to select a fitting divider after the PLL is already set to the correct rate. Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de> Acked-by: James Liao <jamesjj.liao@mediatek.com> Acked-by: Stephen Boyd <sboyd@codeaurora.org>
-rw-r--r--drivers/clk/mediatek/clk-mt8173.c6
-rw-r--r--drivers/clk/mediatek/clk-mtk.h15
2 files changed, 18 insertions, 3 deletions
diff --git a/drivers/clk/mediatek/clk-mt8173.c b/drivers/clk/mediatek/clk-mt8173.c
index 227e356403d9..85c0bfc626ae 100644
--- a/drivers/clk/mediatek/clk-mt8173.c
+++ b/drivers/clk/mediatek/clk-mt8173.c
@@ -558,7 +558,11 @@ static const struct mtk_composite top_muxes[] __initconst = {
MUX_GATE(CLK_TOP_ATB_SEL, "atb_sel", atb_parents, 0x0090, 16, 2, 23),
MUX_GATE(CLK_TOP_VENC_LT_SEL, "venclt_sel", venc_lt_parents, 0x0090, 24, 4, 31),
/* CLK_CFG_6 */
- MUX_GATE(CLK_TOP_DPI0_SEL, "dpi0_sel", dpi0_parents, 0x00a0, 0, 3, 7),
+ /*
+ * The dpi0_sel clock should not propagate rate changes to its parent
+ * clock so the dpi driver can have full control over PLL and divider.
+ */
+ MUX_GATE_FLAGS(CLK_TOP_DPI0_SEL, "dpi0_sel", dpi0_parents, 0x00a0, 0, 3, 7, 0),
MUX_GATE(CLK_TOP_IRDA_SEL, "irda_sel", irda_parents, 0x00a0, 8, 2, 15),
MUX_GATE(CLK_TOP_CCI400_SEL, "cci400_sel", cci400_parents, 0x00a0, 16, 3, 23),
MUX_GATE(CLK_TOP_AUD_1_SEL, "aud_1_sel", aud_1_parents, 0x00a0, 24, 2, 31),
diff --git a/drivers/clk/mediatek/clk-mtk.h b/drivers/clk/mediatek/clk-mtk.h
index 32d2e455eb3f..9f24fcfa304f 100644
--- a/drivers/clk/mediatek/clk-mtk.h
+++ b/drivers/clk/mediatek/clk-mtk.h
@@ -83,7 +83,11 @@ struct mtk_composite {
signed char num_parents;
};
-#define MUX_GATE(_id, _name, _parents, _reg, _shift, _width, _gate) { \
+/*
+ * In case the rate change propagation to parent clocks is undesirable,
+ * this macro allows to specify the clock flags manually.
+ */
+#define MUX_GATE_FLAGS(_id, _name, _parents, _reg, _shift, _width, _gate, _flags) { \
.id = _id, \
.name = _name, \
.mux_reg = _reg, \
@@ -94,9 +98,16 @@ struct mtk_composite {
.divider_shift = -1, \
.parent_names = _parents, \
.num_parents = ARRAY_SIZE(_parents), \
- .flags = CLK_SET_RATE_PARENT, \
+ .flags = _flags, \
}
+/*
+ * Unless necessary, all MUX_GATE clocks propagate rate changes to their
+ * parent clock by default.
+ */
+#define MUX_GATE(_id, _name, _parents, _reg, _shift, _width, _gate) \
+ MUX_GATE_FLAGS(_id, _name, _parents, _reg, _shift, _width, _gate, CLK_SET_RATE_PARENT)
+
#define MUX(_id, _name, _parents, _reg, _shift, _width) { \
.id = _id, \
.name = _name, \