[PATCH v2 04/28] clk: renesas: rzg2l: trust value returned by hardware

Claudiu
2023-09-29T05:40:10Z

From: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>

Initial value of CPG_PL2SDHI_DSEL bits 0..1 or 4..6 is 01b. Hardware user's
manual (r01uh0914ej0130-rzg2l-rzg2lc.pdf) specifies that setting 0 is
prohibited. The rzg2l_cpg_sd_clk_mux_get_parent() should just read
CPG_PL2SDHI_DSEL, trust the value and return the proper clock parent index
based on the read value. Do this.

Fixes: eaff33646f4cb ("clk: renesas: rzg2l: Add SDHI clk mux support")
Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
---

Changes in v2:
- Used "return val ? val - 1 : 0;"

drivers/clk/renesas/rzg2l-cpg.c | 8 +-------
1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/drivers/clk/renesas/rzg2l-cpg.c b/drivers/clk/renesas/rzg2l-cpg.c
index 0679f2c7649e..6f50f0329ecf 100644
--- a/drivers/clk/renesas/rzg2l-cpg.c
+++ b/drivers/clk/renesas/rzg2l-cpg.c
@@ -238,14 +238,8 @@ static u8 rzg2l_cpg_sd_clk_mux_get_parent(struct clk_hw *hw)

val >>= GET_SHIFT(hwdata->conf);
val &= GENMASK(GET_WIDTH(hwdata->conf) - 1, 0);
- if (val) {
- val--;
- } else {
- /* Prohibited clk source, change it to 533 MHz(reset value) */
- rzg2l_cpg_sd_clk_mux_set_parent(hw, 0);
- }

- return val;
+ return val ? val - 1 : 0;
}

static const struct clk_ops rzg2l_cpg_sd_clk_mux_ops = {
--
2.39.2