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clk: mxl: Add option to override gate clks

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[ Upstream commit a5d49bd369 ]

In MxL's LGM SoC, gate clocks can be controlled either from CGU clk driver
i.e. this driver or directly from power management driver/daemon. It is
dependent on the power policy/profile requirements of the end product.

To support such use cases, provide option to override gate clks enable/disable
by adding a flag GATE_CLK_HW which controls if these gate clks are controlled
by HW i.e. this driver or overridden in order to allow it to be controlled
by power profiles instead.

Reviewed-by: Yi xin Zhu <yzhu@maxlinear.com>
Signed-off-by: Rahul Tanwar <rtanwar@maxlinear.com>
Link: https://lore.kernel.org/r/bdc9c89317b5d338a6c4f1d49386b696e947a672.1665642720.git.rtanwar@maxlinear.com
[sboyd@kernel.org: Add braces on many line if-else]
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Stable-dep-of: 106ef3bda2 ("clk: mxl: Fix a clk entry by adding relevant flags")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Rahul Tanwar 2022-10-13 14:48:32 +08:00 • committed by Greg Kroah-Hartman
commit 9dcf2ca5d3
2 changed files with 16 additions and 1 deletions
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16
drivers/clk/x86/clk-cgu.c
View file

@ -354,8 +354,22 @@ int lgm_clk_register_branches(struct lgm_clk_provider *ctx,
hw = lgm_clk_register_fixed_factor(ctx, list); hw = lgm_clk_register_fixed_factor(ctx, list);
break; break;
case CLK_TYPE_GATE: case CLK_TYPE_GATE:
hw = lgm_clk_register_gate(ctx, list); if (list->gate_flags & GATE_CLK_HW) {
hw = lgm_clk_register_gate(ctx, list);
} else {
/*
* GATE_CLKs can be controlled either from
* CGU clk driver i.e. this driver or directly
* from power management driver/daemon. It is
* dependent on the power policy/profile requirements
* of the end product. To override control of gate
* clks from this driver, provide NULL for this index
* of gate clk provider.
*/
hw = NULL;
}
break; break;
default: default:
dev_err(ctx->dev, "invalid clk type\n"); dev_err(ctx->dev, "invalid clk type\n");
return -EINVAL; return -EINVAL;

1
drivers/clk/x86/clk-cgu.h
View file

@ -197,6 +197,7 @@ struct lgm_clk_branch {
/* clock flags definition */ /* clock flags definition */
#define CLOCK_FLAG_VAL_INIT BIT(16) #define CLOCK_FLAG_VAL_INIT BIT(16)
#define MUX_CLK_SW BIT(17) #define MUX_CLK_SW BIT(17)
#define GATE_CLK_HW BIT(18)
#define LGM_MUX(_id, _name, _pdata, _f, _reg, \ #define LGM_MUX(_id, _name, _pdata, _f, _reg, \
_shift, _width, _cf, _v) \ _shift, _width, _cf, _v) \