[PATCH 2/2] [RFC] clk: stm32mp1: Handle SoC speed grade configs

Marek Vasut
2020-05-12T17:07:07Z

There are two speed grades of the STM32MP1, the A/C and D/F, the
former can run up to 650 MHz, the later at up to 800 MHz. Allow
specifying PLL config for both in the DT, so that it is possible
to cater for boards which can be populated with either SoC.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Patrick Delaunay <patrick.delaunay@st.com>
Cc: Patrice Chotard <patrice.chotard@st.com>
---
drivers/clk/clk_stm32mp1.c | 30 ++++++++++++++++++++++++++----
1 file changed, 26 insertions(+), 4 deletions(-)

diff --git a/drivers/clk/clk_stm32mp1.c b/drivers/clk/clk_stm32mp1.c
index 50df8425bf..cecc06638e 100644
--- a/drivers/clk/clk_stm32mp1.c
+++ b/drivers/clk/clk_stm32mp1.c
@@ -4,6 +4,7 @@
*/

#include <common.h>
+#include <asm/arch/sys_proto.h>
#include <clk-uclass.h>
#include <div64.h>
#include <dm.h>
@@ -1464,6 +1465,12 @@ static void pll_csg(struct stm32mp1_clk_priv *priv, int pll_id, u32 *csg)
setbits_le32(priv->base + pll[pll_id].pllxcr, RCC_PLLNCR_SSCG_CTRL);
}

+static __maybe_unused int stm32mp1_is_df(void)
+{
+ /* ID bit 7 is set on 15x{D,F}xx and not on 15x{A,C}xx */
+ return get_cpu_type() & BIT(7);
+}
+
static __maybe_unused int pll_set_rate(struct udevice *dev,
int pll_id,
int div_id,
@@ -1491,8 +1498,13 @@ static __maybe_unused int pll_set_rate(struct udevice *dev,

ret = ofnode_read_u32_array(plloff, "cfg",
pllcfg, PLLCFG_NB);
- if (ret < 0)
- return -FDT_ERR_NOTFOUND;
+ if (ret < 0) {
+ ret = ofnode_read_u32_array(plloff,
+ stm32mp1_is_df() ? "cfg-df" : "cfg-ac",
+ pllcfg, PLLCFG_NB);
+ if (ret < 0)
+ return -FDT_ERR_NOTFOUND;
+ }

fck_ref = pll_get_fref_ck(priv, pll_id);

@@ -1687,8 +1699,13 @@ static int stm32mp1_clktree(struct udevice *dev)
ret = ofnode_read_u32_array(plloff[i], "cfg",
pllcfg[i], PLLCFG_NB);
if (ret < 0) {
- debug("field cfg invalid: error %d\n", ret);
- return -FDT_ERR_NOTFOUND;
+ ret = ofnode_read_u32_array(plloff[i],
+ stm32mp1_is_df() ? "cfg-df" : "cfg-ac",
+ pllcfg[i], PLLCFG_NB);
+ if (ret < 0) {
+ debug("field cfg invalid: error %d\n", ret);
+ return -FDT_ERR_NOTFOUND;
+ }
}
}

@@ -1783,6 +1800,11 @@ static int stm32mp1_clktree(struct udevice *dev)
continue;

fracv = ofnode_read_u32_default(plloff[i], "frac", 0);
+ if (!fracv) {
+ fracv = ofnode_read_u32_default(plloff[i],
+ stm32mp1_is_df() ? "frac-df" : "frac-ac",
+ 0);
+ }
pll_config(priv, i, pllcfg[i], fracv);
ret = ofnode_read_u32_array(plloff[i], "csg", csg, PLLCSG_NB);
if (!ret) {
--
2.25.1