linux-kernel - [PATCH 15/15] clk: pistachio: Fix wrong SDHost card speed

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Date:   Sun, 22 Jul 2018 23:20:10 +0200
From:   Andreas Färber <afaerber@...e.de>
To:     linux-mips@...ux-mips.org
Cc:     Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paul.burton@...s.com>,
        James Hogan <jhogan@...nel.org>, linux-kernel@...r.kernel.org,
        Govindraj Raja <Govindraj.Raja@...tec.com>,
        Andreas Färber <afaerber@...e.de>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>, linux-clk@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: [PATCH 15/15] clk: pistachio: Fix wrong SDHost card speed

From: Govindraj Raja <Govindraj.Raja@...tec.com>

The SDHost currently clocks the card 4x slower than it
should do, because there is a fixed divide by 4 in the
sdhost wrapper that is not present in the clock tree.
To model this, add a fixed divide by 4 clock node in
the SDHost clock path.

This will ensure the right clock frequency is selected when
the mmc driver tries to configure frequency on card insert.

Signed-off-by: Govindraj Raja <Govindraj.Raja@...tec.com>
Signed-off-by: Andreas Färber <afaerber@...e.de>
---
 drivers/clk/pistachio/clk-pistachio.c     | 3 ++-
 include/dt-bindings/clock/pistachio-clk.h | 1 +
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/pistachio/clk-pistachio.c b/drivers/clk/pistachio/clk-pistachio.c
index c4ceb5eaf46c..1c968d9a6e17 100644
--- a/drivers/clk/pistachio/clk-pistachio.c
+++ b/drivers/clk/pistachio/clk-pistachio.c
@@ -44,7 +44,7 @@ static struct pistachio_gate pistachio_gates[] __initdata = {
 	GATE(CLK_AUX_ADC_INTERNAL, "aux_adc_internal", "sys_internal_div",
 	     0x104, 22),
 	GATE(CLK_AUX_ADC, "aux_adc", "aux_adc_div", 0x104, 23),
-	GATE(CLK_SD_HOST, "sd_host", "sd_host_div", 0x104, 24),
+	GATE(CLK_SD_HOST, "sd_host", "sd_host_div4", 0x104, 24),
 	GATE(CLK_BT, "bt", "bt_div", 0x104, 25),
 	GATE(CLK_BT_DIV4, "bt_div4", "bt_div4_div", 0x104, 26),
 	GATE(CLK_BT_DIV8, "bt_div8", "bt_div8_div", 0x104, 27),
@@ -54,6 +54,7 @@ static struct pistachio_gate pistachio_gates[] __initdata = {
 static struct pistachio_fixed_factor pistachio_ffs[] __initdata = {
 	FIXED_FACTOR(CLK_WIFI_DIV4, "wifi_div4", "wifi_pll", 4),
 	FIXED_FACTOR(CLK_WIFI_DIV8, "wifi_div8", "wifi_pll", 8),
+	FIXED_FACTOR(CLK_SDHOST_DIV4, "sd_host_div4", "sd_host_div", 4),
 };
 
 static struct pistachio_div pistachio_divs[] __initdata = {
diff --git a/include/dt-bindings/clock/pistachio-clk.h b/include/dt-bindings/clock/pistachio-clk.h
index 039f83facb68..77b92aed241d 100644
--- a/include/dt-bindings/clock/pistachio-clk.h
+++ b/include/dt-bindings/clock/pistachio-clk.h
@@ -21,6 +21,7 @@
 /* Fixed-factor clocks */
 #define CLK_WIFI_DIV4			16
 #define CLK_WIFI_DIV8			17
+#define CLK_SDHOST_DIV4			18
 
 /* Gate clocks */
 #define CLK_MIPS			32
-- 
2.16.4