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clk: meson: gxbb: remove the "cpu_clk" from the GXBB and GXL driver 

It seems that the "cpu_clk" was carried over from the meson8b clock
controller driver. On Meson GX (GXBB/GXL/GXM) the registers which are
used by the cpu_clk have a different purpose (in other words: they don't
control the CPU clock anymore). HHI_SYS_CPU_CLK_CNTL1 bits 31:24 are
reserved according to the public S905 datasheet, while bit 23 is the
"A53_trace_clk_DIS" gate (which according to the datasheet should only
be used in case a silicon bug is discovered) and bits 22:20 are a
divider (A53_trace_clk). The meson clk-cpu code however expects that
bits 28:20 are reserved for a divider (according to the public S805
datasheet this "SCALE_DIV: This value represents an N+1 divider of the
input clock.").

The CPU clock on Meson GX SoCs is provided by the SCPI DVFS clock
driver instead. Two examples from a Meson GXL S905X SoC:
- vcpu (SCPI DVFS clock 0) rate: 1000000000 / cpu_clk rate: 708000000
- vcpu (SCPI DVFS clock 0) rate: 1512000000 / cpu_clk rate: 708000000

Unfortunately the CLKID_CPUCLK was already exported (but is currently
not used) to DT. Due to the removal of this clock definition there is
now a hole in the clk_hw_onecell_data (which is not a problem because
this case is already handled in gxbb_clkc_probe).

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
hifive-unleashed-5.1
Martin Blumenstingl 2017-05-04 20:19:20 +02:00 committed by Jerome Brunet
parent f40a8ce96a
commit 96b61c8d2e
2 changed files with 4 additions and 62 deletions
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64
drivers/clk/meson/gxbb.c
View File

@ -278,20 +278,6 @@ static const struct pll_rate_table gxl_gp0_pll_rate_table[] = {
{ /* sentinel */ },
};
static const struct clk_div_table cpu_div_table[] = {
{ .val = 1, .div = 1 },
{ .val = 2, .div = 2 },
{ .val = 3, .div = 3 },
{ .val = 2, .div = 4 },
{ .val = 3, .div = 6 },
{ .val = 4, .div = 8 },
{ .val = 5, .div = 10 },
{ .val = 6, .div = 12 },
{ .val = 7, .div = 14 },
{ .val = 8, .div = 16 },
{ /* sentinel */ },
};
static struct meson_clk_pll gxbb_fixed_pll = {
.m = {
.reg_off = HHI_MPLL_CNTL,
@ -612,21 +598,10 @@ static struct meson_clk_mpll gxbb_mpll2 = {
};
/*
* FIXME cpu clocks and the legacy composite clocks (e.g. clk81) are both PLL
* post-dividers and should be modeled with their respective PLLs via the
* forthcoming coordinated clock rates feature
* FIXME The legacy composite clocks (e.g. clk81) are both PLL post-dividers
* and should be modeled with their respective PLLs via the forthcoming
* coordinated clock rates feature
*/
static struct meson_clk_cpu gxbb_cpu_clk = {
.reg_off = HHI_SYS_CPU_CLK_CNTL1,
.div_table = cpu_div_table,
.clk_nb.notifier_call = meson_clk_cpu_notifier_cb,
.hw.init = &(struct clk_init_data){
.name = "cpu_clk",
.ops = &meson_clk_cpu_ops,
.parent_names = (const char *[]){ "sys_pll" },
.num_parents = 1,
},
};
static u32 mux_table_clk81[] = { 6, 5, 7 };
@ -1045,7 +1020,6 @@ static MESON_GATE(gxbb_ao_i2c, HHI_GCLK_AO, 4);
static struct clk_hw_onecell_data gxbb_hw_onecell_data = {
.hws = {
[CLKID_SYS_PLL] = &gxbb_sys_pll.hw,
[CLKID_CPUCLK] = &gxbb_cpu_clk.hw,
[CLKID_HDMI_PLL] = &gxbb_hdmi_pll.hw,
[CLKID_FIXED_PLL] = &gxbb_fixed_pll.hw,
[CLKID_FCLK_DIV2] = &gxbb_fclk_div2.hw,
@ -1165,7 +1139,6 @@ static struct clk_hw_onecell_data gxbb_hw_onecell_data = {
static struct clk_hw_onecell_data gxl_hw_onecell_data = {
.hws = {
[CLKID_SYS_PLL] = &gxbb_sys_pll.hw,
[CLKID_CPUCLK] = &gxbb_cpu_clk.hw,
[CLKID_HDMI_PLL] = &gxbb_hdmi_pll.hw,
[CLKID_FIXED_PLL] = &gxbb_fixed_pll.hw,
[CLKID_FCLK_DIV2] = &gxbb_fclk_div2.hw,
@ -1430,7 +1403,6 @@ struct clkc_data {
unsigned int clk_dividers_count;
struct meson_clk_audio_divider *const *clk_audio_dividers;
unsigned int clk_audio_dividers_count;
struct meson_clk_cpu *cpu_clk;
struct clk_hw_onecell_data *hw_onecell_data;
};
@ -1447,7 +1419,6 @@ static const struct clkc_data gxbb_clkc_data = {
.clk_dividers_count = ARRAY_SIZE(gxbb_clk_dividers),
.clk_audio_dividers = gxbb_audio_dividers,
.clk_audio_dividers_count = ARRAY_SIZE(gxbb_audio_dividers),
.cpu_clk = &gxbb_cpu_clk,
.hw_onecell_data = &gxbb_hw_onecell_data,
};
@ -1464,7 +1435,6 @@ static const struct clkc_data gxl_clkc_data = {
.clk_dividers_count = ARRAY_SIZE(gxbb_clk_dividers),
.clk_audio_dividers = gxbb_audio_dividers,
.clk_audio_dividers_count = ARRAY_SIZE(gxbb_audio_dividers),
.cpu_clk = &gxbb_cpu_clk,
.hw_onecell_data = &gxl_hw_onecell_data,
};
@ -1479,8 +1449,6 @@ static int gxbb_clkc_probe(struct platform_device *pdev)
const struct clkc_data *clkc_data;
void __iomem *clk_base;
int ret, clkid, i;
struct clk_hw *parent_hw;
struct clk *parent_clk;
struct device *dev = &pdev->dev;
clkc_data = of_device_get_match_data(&pdev->dev);
@ -1502,9 +1470,6 @@ static int gxbb_clkc_probe(struct platform_device *pdev)
for (i = 0; i < clkc_data->clk_mplls_count; i++)
clkc_data->clk_mplls[i]->base = clk_base;
/* Populate the base address for CPU clk */
clkc_data->cpu_clk->base = clk_base;
/* Populate base address for gates */
for (i = 0; i < clkc_data->clk_gates_count; i++)
clkc_data->clk_gates[i]->reg = clk_base +
@ -1538,29 +1503,6 @@ static int gxbb_clkc_probe(struct platform_device *pdev)
goto iounmap;
}
/*
* Register CPU clk notifier
*
* FIXME this is wrong for a lot of reasons. First, the muxes should be
* struct clk_hw objects. Second, we shouldn't program the muxes in
* notifier handlers. The tricky programming sequence will be handled
* by the forthcoming coordinated clock rates mechanism once that
* feature is released.
*
* Furthermore, looking up the parent this way is terrible. At some
* point we will stop allocating a default struct clk when registering
* a new clk_hw, and this hack will no longer work. Releasing the ccr
* feature before that time solves the problem :-)
*/
parent_hw = clk_hw_get_parent(&clkc_data->cpu_clk->hw);
parent_clk = parent_hw->clk;
ret = clk_notifier_register(parent_clk, &clkc_data->cpu_clk->clk_nb);
if (ret) {
pr_err("%s: failed to register clock notifier for cpu_clk\n",
__func__);
goto iounmap;
}
return of_clk_add_hw_provider(dev->of_node, of_clk_hw_onecell_get,
clkc_data->hw_onecell_data);

2
drivers/clk/meson/gxbb.h
View File

@ -171,7 +171,7 @@
* to be exposed to client nodes in DT: include/dt-bindings/clock/gxbb-clkc.h
*/
#define CLKID_SYS_PLL 0
#define CLKID_CPUCLK 1
/* ID 1 is unused (it was used by the non-existing CLKID_CPUCLK before) */
/* CLKID_HDMI_PLL */
#define CLKID_FIXED_PLL 3
/* CLKID_FCLK_DIV2 */