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clk: imx: clk-gate2: allow custom gate configuration

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The 2-bit gates found i.MX and Vybrid SoC support different clock
configuration:

0b00: clk disabled
0b01: clk enabled in RUN mode but disabled in WAIT and STOP mode
0b10: clk enabled in RUN, WAIT and STOP mode (only Vybrid)
0b11: clk enabled in RUN and WAIT mode

For some clocks, we might want to configure different behaviour,
e.g. a memory clock should be on even in STOP mode. Add a new
function imx_clk_gate2_cgr which allow to configure specific
gate values through the cgr_val parameter.

Signed-off-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
This commit is contained in:
Stefan Agner 2016-03-09 18:16:47 -08:00 committed by Shawn Guo
parent 0b55257ebc
commit 456829228f
2 changed files with 15 additions and 5 deletions
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7
drivers/clk/imx/clk-gate2.c
View File

@ -31,6 +31,7 @@ struct clk_gate2 {
struct clk_hw hw;
void __iomem *reg;
u8 bit_idx;
u8 cgr_val;
u8 flags;
spinlock_t *lock;
unsigned int *share_count;
@ -50,7 +51,8 @@ static int clk_gate2_enable(struct clk_hw *hw)
goto out;
reg = readl(gate->reg);
reg |= 3 << gate->bit_idx;
reg &= ~(3 << gate->bit_idx);
reg |= gate->cgr_val << gate->bit_idx;
writel(reg, gate->reg);
out:
@ -125,7 +127,7 @@ static struct clk_ops clk_gate2_ops = {
struct clk *clk_register_gate2(struct device *dev, const char *name,
const char *parent_name, unsigned long flags,
void __iomem *reg, u8 bit_idx,
void __iomem *reg, u8 bit_idx, u8 cgr_val,
u8 clk_gate2_flags, spinlock_t *lock,
unsigned int *share_count)
{
@ -140,6 +142,7 @@ struct clk *clk_register_gate2(struct device *dev, const char *name,
/* struct clk_gate2 assignments */
gate->reg = reg;
gate->bit_idx = bit_idx;
gate->cgr_val = cgr_val;
gate->flags = clk_gate2_flags;
gate->lock = lock;
gate->share_count = share_count;

13
drivers/clk/imx/clk.h
View File

@ -41,7 +41,7 @@ struct clk *imx_clk_pllv3(enum imx_pllv3_type type, const char *name,
struct clk *clk_register_gate2(struct device *dev, const char *name,
const char *parent_name, unsigned long flags,
void __iomem *reg, u8 bit_idx,
void __iomem *reg, u8 bit_idx, u8 cgr_val,
u8 clk_gate_flags, spinlock_t *lock,
unsigned int *share_count);
@ -55,7 +55,7 @@ static inline struct clk *imx_clk_gate2(const char *name, const char *parent,
void __iomem *reg, u8 shift)
{
return clk_register_gate2(NULL, name, parent, CLK_SET_RATE_PARENT, reg,
shift, 0, &imx_ccm_lock, NULL);
shift, 0x3, 0, &imx_ccm_lock, NULL);
}
static inline struct clk *imx_clk_gate2_shared(const char *name,
@ -63,7 +63,14 @@ static inline struct clk *imx_clk_gate2_shared(const char *name,
unsigned int *share_count)
{
return clk_register_gate2(NULL, name, parent, CLK_SET_RATE_PARENT, reg,
shift, 0, &imx_ccm_lock, share_count);
shift, 0x3, 0, &imx_ccm_lock, share_count);
}
static inline struct clk *imx_clk_gate2_cgr(const char *name, const char *parent,
void __iomem *reg, u8 shift, u8 cgr_val)
{
return clk_register_gate2(NULL, name, parent, CLK_SET_RATE_PARENT, reg,
shift, cgr_val, 0, &imx_ccm_lock, NULL);
}
struct clk *imx_clk_pfd(const char *name, const char *parent_name,