Re: [PATCH 2/2] ARM: davinci: da850: use clk->set_parent for async3
From: David Lechner
Date: Sat Apr 16 2016 - 15:31:33 EST
On 04/14/2016 02:13 PM, David Lechner wrote:
The da850 family of processors has an async3 clock domain that can be
muxed to either pll0_sysclk2 or pll1_sysclk2. Now that the davinci clocks
have a set_parent callback, we can use this to control the async3 mux
instead of a stand-alone function.
This adds a new async3_clk and sets the appropriate child clocks. The
default is use to pll1_sysclk2 since it is not affected by processor
frequency scaling.
Signed-off-by: David Lechner <david@xxxxxxxxxxxxxx>
---
v4 changes:
* Fixed strict checkpatch complaint about {} in if/else
arch/arm/mach-davinci/da850.c | 82 ++++++++++++++++++-------------------------
1 file changed, 34 insertions(+), 48 deletions(-)
diff --git a/arch/arm/mach-davinci/da850.c b/arch/arm/mach-davinci/da850.c
index 1f85bbc..ace7433 100644
--- a/arch/arm/mach-davinci/da850.c
+++ b/arch/arm/mach-davinci/da850.c
@@ -34,9 +34,6 @@
#include "clock.h"
#include "mux.h"
-/* SoC specific clock flags */
-#define DA850_CLK_ASYNC3 BIT(16)
-
#define DA850_PLL1_BASE 0x01e1a000
#define DA850_TIMER64P2_BASE 0x01f0c000
#define DA850_TIMER64P3_BASE 0x01f0d000
@@ -161,6 +158,33 @@ static struct clk pll1_sysclk3 = {
.div_reg = PLLDIV3,
};
+static int da850_async3_set_parent(struct clk *clk, struct clk *parent)
+{
+ u32 val;
+
+ val = readl(DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP3_REG));
+
+ /* Set the USB 1.1 PHY clock mux based on the parent clock. */
I seem to have regressed here since the last revision, this is supposed
to read:
/* Set the async3 clock domain mux based on the parent clock. */
Although now that I am looking at it again, it doesn't really add
anything useful and could be omitted altogether.
+ if (parent == &pll0_sysclk2) {
+ val &= ~CFGCHIP3_ASYNC3_CLKSRC;
+ } else if (parent == &pll1_sysclk2) {
+ val |= CFGCHIP3_ASYNC3_CLKSRC;
+ } else {
+ pr_err("Bad parent on async3 clock mux\n");
+ return -EINVAL;
+ }
+
+ writel(val, DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP3_REG));
+
+ return 0;
+}
+
+static struct clk async3_clk = {
+ .name = "async3",
+ .parent = &pll1_sysclk2,
+ .set_parent = da850_async3_set_parent,
+};
+
static struct clk i2c0_clk = {
.name = "i2c0",
.parent = &pll0_aux_clk,
@@ -234,18 +258,16 @@ static struct clk uart0_clk = {
static struct clk uart1_clk = {
.name = "uart1",
- .parent = &pll0_sysclk2,
+ .parent = &async3_clk,
.lpsc = DA8XX_LPSC1_UART1,
.gpsc = 1,
- .flags = DA850_CLK_ASYNC3,
};
static struct clk uart2_clk = {
.name = "uart2",
- .parent = &pll0_sysclk2,
+ .parent = &async3_clk,
.lpsc = DA8XX_LPSC1_UART2,
.gpsc = 1,
- .flags = DA850_CLK_ASYNC3,
};
static struct clk aintc_clk = {
@@ -300,10 +322,9 @@ static struct clk emac_clk = {
static struct clk mcasp_clk = {
.name = "mcasp",
- .parent = &pll0_sysclk2,
+ .parent = &async3_clk,
.lpsc = DA8XX_LPSC1_McASP0,
.gpsc = 1,
- .flags = DA850_CLK_ASYNC3,
};
static struct clk lcdc_clk = {
@@ -355,10 +376,9 @@ static struct clk spi0_clk = {
static struct clk spi1_clk = {
.name = "spi1",
- .parent = &pll0_sysclk2,
+ .parent = &async3_clk,
.lpsc = DA8XX_LPSC1_SPI1,
.gpsc = 1,
- .flags = DA850_CLK_ASYNC3,
};
static struct clk vpif_clk = {
@@ -386,10 +406,9 @@ static struct clk dsp_clk = {
static struct clk ehrpwm_clk = {
.name = "ehrpwm",
- .parent = &pll0_sysclk2,
+ .parent = &async3_clk,
.lpsc = DA8XX_LPSC1_PWM,
.gpsc = 1,
- .flags = DA850_CLK_ASYNC3,
};
#define DA8XX_EHRPWM_TBCLKSYNC BIT(12)
@@ -421,10 +440,9 @@ static struct clk ehrpwm_tbclk = {
static struct clk ecap_clk = {
.name = "ecap",
- .parent = &pll0_sysclk2,
+ .parent = &async3_clk,
.lpsc = DA8XX_LPSC1_ECAP,
.gpsc = 1,
- .flags = DA850_CLK_ASYNC3,
};
static struct clk_lookup da850_clks[] = {
@@ -442,6 +460,7 @@ static struct clk_lookup da850_clks[] = {
CLK(NULL, "pll1_aux", &pll1_aux_clk),
CLK(NULL, "pll1_sysclk2", &pll1_sysclk2),
CLK(NULL, "pll1_sysclk3", &pll1_sysclk3),
+ CLK(NULL, "async3", &async3_clk),
CLK("i2c_davinci.1", NULL, &i2c0_clk),
CLK(NULL, "timer0", &timerp64_0_clk),
CLK("davinci-wdt", NULL, &timerp64_1_clk),
@@ -909,30 +928,6 @@ static struct davinci_timer_info da850_timer_info = {
.clocksource_id = T0_TOP,
};
-static void da850_set_async3_src(int pllnum)
-{
- struct clk *clk, *newparent = pllnum ? &pll1_sysclk2 : &pll0_sysclk2;
- struct clk_lookup *c;
- unsigned int v;
- int ret;
-
- for (c = da850_clks; c->clk; c++) {
- clk = c->clk;
- if (clk->flags & DA850_CLK_ASYNC3) {
- ret = clk_set_parent(clk, newparent);
- WARN(ret, "DA850: unable to re-parent clock %s",
- clk->name);
- }
- }
-
- v = __raw_readl(DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP3_REG));
- if (pllnum)
- v |= CFGCHIP3_ASYNC3_CLKSRC;
- else
- v &= ~CFGCHIP3_ASYNC3_CLKSRC;
- __raw_writel(v, DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP3_REG));
-}
-
#ifdef CONFIG_CPU_FREQ
/*
* Notes:
@@ -1328,15 +1323,6 @@ void __init da850_init(void)
if (WARN(!da8xx_syscfg1_base, "Unable to map syscfg1 module"))
return;
- /*
- * Move the clock source of Async3 domain to PLL1 SYSCLK2.
- * This helps keeping the peripherals on this domain insulated
- * from CPU frequency changes caused by DVFS. The firmware sets
- * both PLL0 and PLL1 to the same frequency so, there should not
- * be any noticeable change even in non-DVFS use cases.
- */
- da850_set_async3_src(1);
-
/* Unlock writing to PLL0 registers */
v = __raw_readl(DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP0_REG));
v &= ~CFGCHIP0_PLL_MASTER_LOCK;