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clk: Add support for I2C clocks on NXP's imx6q SoC which use CCF

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This change adds support for I2C clock modeled in CCF. This code intention
is to only enable those clocks in the I2C driver with default settings.
For that reason the "busy" versions of clocks reuse the generic approach
and would need to be updated when one wants to adjust the I2C clock
frequency in U-Boot.

Signed-off-by: Lukasz Majewski <lukma@denx.de>
This commit is contained in:
Lukasz Majewski 2019-10-15 12:44:57 +02:00
parent 02e2a2ad2f
commit 727fa4539c
2 changed files with 39 additions and 0 deletions
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21
drivers/clk/imx/clk-imx6q.c
View File

@ -89,6 +89,9 @@ static struct clk_ops imx6q_clk_ops = {
};
static const char *const usdhc_sels[] = { "pll2_pfd2_396m", "pll2_pfd0_352m", };
static const char *const periph_sels[] = { "periph_pre", "periph_clk2", };
static const char *const periph_pre_sels[] = { "pll2_bus", "pll2_pfd2_396m",
"pll2_pfd0_352m", "pll2_198m", };
static int imx6q_clk_probe(struct udevice *dev)
{
@ -161,6 +164,24 @@ static int imx6q_clk_probe(struct udevice *dev)
clk_dm(IMX6QDL_CLK_USDHC4,
imx_clk_gate2("usdhc4", "usdhc4_podf", base + 0x80, 8));
clk_dm(IMX6QDL_CLK_PERIPH_PRE,
imx_clk_mux("periph_pre", base + 0x18, 18, 2, periph_pre_sels,
ARRAY_SIZE(periph_pre_sels)));
clk_dm(IMX6QDL_CLK_PERIPH,
imx_clk_busy_mux("periph", base + 0x14, 25, 1, base + 0x48,
5, periph_sels, ARRAY_SIZE(periph_sels)));
clk_dm(IMX6QDL_CLK_AHB,
imx_clk_busy_divider("ahb", "periph", base + 0x14, 10, 3,
base + 0x48, 1));
clk_dm(IMX6QDL_CLK_IPG,
imx_clk_divider("ipg", "ahb", base + 0x14, 8, 2));
clk_dm(IMX6QDL_CLK_IPG_PER,
imx_clk_divider("ipg_per", "ipg", base + 0x1c, 0, 6));
clk_dm(IMX6QDL_CLK_I2C1,
imx_clk_gate2("i2c1", "ipg_per", base + 0x70, 6));
clk_dm(IMX6QDL_CLK_I2C2,
imx_clk_gate2("i2c2", "ipg_per", base + 0x70, 8));
return 0;
}

18
drivers/clk/imx/clk.h
View File

@ -92,6 +92,14 @@ static inline struct clk *imx_clk_divider(const char *name, const char *parent,
reg, shift, width, 0);
}
static inline struct clk *
imx_clk_busy_divider(const char *name, const char *parent, void __iomem *reg,
u8 shift, u8 width, void __iomem *busy_reg, u8 busy_shift)
{
return clk_register_divider(NULL, name, parent, CLK_SET_RATE_PARENT,
reg, shift, width, 0);
}
static inline struct clk *imx_clk_divider2(const char *name, const char *parent,
void __iomem *reg, u8 shift, u8 width)
{
@ -126,6 +134,16 @@ static inline struct clk *imx_clk_mux(const char *name, void __iomem *reg,
width, 0);
}
static inline struct clk *
imx_clk_busy_mux(const char *name, void __iomem *reg, u8 shift, u8 width,
void __iomem *busy_reg, u8 busy_shift,
const char * const *parents, int num_parents)
{
return clk_register_mux(NULL, name, parents, num_parents,
CLK_SET_RATE_NO_REPARENT, reg, shift,
width, 0);
}
static inline struct clk *imx_clk_mux2(const char *name, void __iomem *reg,
u8 shift, u8 width, const char * const *parents,
int num_parents)