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clk: nuvoton: add read only feature for clk driver

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Add a flag to set ahb/apb/fiu/spi clock divider as read-only
The spi clock setting is related to booting flash, it is setup by early
bootloader.
It just protects the clock source and can't modify it in uboot.

Signed-off-by: Jim Liu <JJLIU0@nuvoton.com>
Reviewed-by: Sean Anderson <seanga2@gmail.com>
Link: https://lore.kernel.org/r/20231114090004.3746024-1-JJLIU0@nuvoton.com
This commit is contained in:
Jim Liu 2023-11-14 17:00:04 +08:00 committed by Sean Anderson
parent 5666558a6c
commit 652d8d4561
3 changed files with 19 additions and 9 deletions
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15
drivers/clk/nuvoton/clk_npcm.c
View File

@ -135,7 +135,7 @@ static u32 npcm_clk_get_div(struct clk *clk)
return div;
}
static u32 npcm_clk_set_div(struct clk *clk, u32 div)
static int npcm_clk_set_div(struct clk *clk, u32 div)
{
struct npcm_clk_priv *priv = dev_get_priv(clk->dev);
struct npcm_clk_div *divider;
@ -145,6 +145,9 @@ static u32 npcm_clk_set_div(struct clk *clk, u32 div)
if (!divider)
return -EINVAL;
if (divider->flags & DIV_RO)
return 0;
if (divider->flags & PRE_DIV2)
div = div >> 1;
@ -153,6 +156,12 @@ static u32 npcm_clk_set_div(struct clk *clk, u32 div)
else
clkdiv = ilog2(div);
if (clkdiv > (divider->mask >> (ffs(divider->mask) - 1))) {
printf("clkdiv(%d) for clk(%ld) is over limit\n",
clkdiv, clk->id);
return -EINVAL;
}
val = readl(priv->base + divider->reg);
val &= ~divider->mask;
val |= (clkdiv << (ffs(divider->mask) - 1)) & divider->mask;
@ -253,8 +262,8 @@ static ulong npcm_clk_set_rate(struct clk *clk, ulong rate)
if (ret)
return ret;
debug("%s: rate %lu, new rate (%lu / %u)\n", __func__, rate, parent_rate, div);
return (parent_rate / div);
debug("%s: rate %lu, new rate %lu\n", __func__, rate, npcm_clk_get_rate(clk));
return npcm_clk_get_rate(clk);
}
static int npcm_clk_set_parent(struct clk *clk, struct clk *parent)

1
drivers/clk/nuvoton/clk_npcm.h
View File

@ -50,6 +50,7 @@
#define PRE_DIV2 BIT(2) /* Pre divisor = 2 */
#define POST_DIV2 BIT(3) /* Post divisor = 2 */
#define FIXED_PARENT BIT(4) /* clock source is fixed */
#define DIV_RO BIT(5) /* divider is read-only */
/* Parameters of PLL configuration */
struct npcm_clk_pll {

12
drivers/clk/nuvoton/clk_npcm8xx.c
View File

@ -45,12 +45,12 @@ static struct npcm_clk_select npcm8xx_clk_selectors[] = {
};
static struct npcm_clk_div npcm8xx_clk_dividers[] = {
{NPCM8XX_CLK_AHB, CLKDIV1, CLK4DIV, DIV_TYPE1 | PRE_DIV2},
{NPCM8XX_CLK_APB2, CLKDIV2, APB2CKDIV, DIV_TYPE2},
{NPCM8XX_CLK_APB5, CLKDIV2, APB5CKDIV, DIV_TYPE2},
{NPCM8XX_CLK_SPI0, CLKDIV3, SPI0CKDIV, DIV_TYPE1},
{NPCM8XX_CLK_SPI1, CLKDIV3, SPI1CKDIV, DIV_TYPE1},
{NPCM8XX_CLK_SPI3, CLKDIV1, SPI3CKDIV, DIV_TYPE1},
{NPCM8XX_CLK_AHB, CLKDIV1, CLK4DIV, DIV_TYPE1 | PRE_DIV2 | DIV_RO},
{NPCM8XX_CLK_APB2, CLKDIV2, APB2CKDIV, DIV_TYPE2 | DIV_RO},
{NPCM8XX_CLK_APB5, CLKDIV2, APB5CKDIV, DIV_TYPE2 | DIV_RO},
{NPCM8XX_CLK_SPI0, CLKDIV3, SPI0CKDIV, DIV_TYPE1 | DIV_RO},
{NPCM8XX_CLK_SPI1, CLKDIV3, SPI1CKDIV, DIV_TYPE1 | DIV_RO},
{NPCM8XX_CLK_SPI3, CLKDIV1, SPI3CKDIV, DIV_TYPE1 | DIV_RO},
{NPCM8XX_CLK_SPIX, CLKDIV3, SPIXCKDIV, DIV_TYPE1},
{NPCM8XX_CLK_UART, CLKDIV1, UARTDIV1, DIV_TYPE1},
{NPCM8XX_CLK_UART2, CLKDIV3, UARTDIV2, DIV_TYPE1},