On 28.10.2015 16:57, Pavel Fedin wrote:
> Bindings are based on u-boot implementation, however they are stored in
> subnodes, providing support for more than one bank.
>
> Since the driver now does more than suspend-resume support, dependency on
> CONFIG_PM is removed.
>
> Signed-off-by: Pavel Fedin <p.fedin@xxxxxxxxxxx>
> ---
> arch/arm/mach-exynos/Kconfig | 2 +-
> drivers/soc/samsung/Kconfig | 2 +-
> drivers/soc/samsung/exynos-srom.c | 42 ++++++++++++++++++++++++++++++++++++++-
> 3 files changed, 43 insertions(+), 3 deletions(-)
>
> diff --git a/arch/arm/mach-exynos/Kconfig b/arch/arm/mach-exynos/Kconfig
> index 83c85f5..c22dc42 100644
> --- a/arch/arm/mach-exynos/Kconfig
> +++ b/arch/arm/mach-exynos/Kconfig
> @@ -16,7 +16,7 @@ menuconfig ARCH_EXYNOS
> select ARM_GIC
> select COMMON_CLK_SAMSUNG
> select EXYNOS_THERMAL
> - select EXYNOS_SROM if PM
> + select EXYNOS_SROM
> select HAVE_ARM_SCU if SMP
> select HAVE_S3C2410_I2C if I2C
> select HAVE_S3C2410_WATCHDOG if WATCHDOG
> diff --git a/drivers/soc/samsung/Kconfig b/drivers/soc/samsung/Kconfig
> index 2833b5b..ea4bc2a 100644
> --- a/drivers/soc/samsung/Kconfig
> +++ b/drivers/soc/samsung/Kconfig
> @@ -8,6 +8,6 @@ config SOC_SAMSUNG
>
> config EXYNOS_SROM
> bool
> - depends on ARM && ARCH_EXYNOS && PM
> + depends on ARM && ARCH_EXYNOS
>
> endmenu
> diff --git a/drivers/soc/samsung/exynos-srom.c b/drivers/soc/samsung/exynos-srom.c
> index 57a232d..6c8c56a 100644
> --- a/drivers/soc/samsung/exynos-srom.c
> +++ b/drivers/soc/samsung/exynos-srom.c
> @@ -67,9 +67,46 @@ static struct exynos_srom_reg_dump *exynos_srom_alloc_reg_dump(
> return rd;
> }
>
> +static int decode_sromc(struct exynos_srom *srom, struct device_node *np)
> +{
> + u32 bank, width;
> + u32 timing[7];
> + u32 bw;
> +
> + if (of_property_read_u32(np, "bank", &bank))
> + return -ENXIO;
This is an invalid value in DTB, not missing device or address, so -EINVAL.
> + if (of_property_read_u32(np, "width", &width))
> + width = 1;
> + if (of_property_read_u32_array(np, "srom-timing", timing, 7)) {
s/7/ARRAY_SIZE/
> + pr_err("Could not decode SROMC configuration\n");
dev_err()
> + return -ENXIO;
Here also I would prefer -EINVAL
> + }
> +
> + bank *= 4; /* Convert bank into shift/offset */
> +
> + bw = 1 << EXYNOS_SROM_BW__BYTEENABLE__SHIFT;
> + if (width == 2)
> + bw |= 1 << EXYNOS_SROM_BW__DATAWIDTH__SHIFT;
> + bw <<= bank;
> + bw |= __raw_readl(srom->reg_base + EXYNOS_SROM_BW) &
> + ~(EXYNOS_SROM_BW__CS_MASK << bank);
This is reversed pattern. First read, then set or clear bits and finally
write. It makes easier to understand what is the intention.
> + __raw_writel(bw, srom->reg_base + EXYNOS_SROM_BW);
> +
> + __raw_writel((timing[0] << EXYNOS_SROM_BCX__PMC__SHIFT) |
> + (timing[1] << EXYNOS_SROM_BCX__TACP__SHIFT) |
> + (timing[2] << EXYNOS_SROM_BCX__TCAH__SHIFT) |
> + (timing[3] << EXYNOS_SROM_BCX__TCOH__SHIFT) |
> + (timing[4] << EXYNOS_SROM_BCX__TACC__SHIFT) |
> + (timing[5] << EXYNOS_SROM_BCX__TCOS__SHIFT) |
> + (timing[6] << EXYNOS_SROM_BCX__TACS__SHIFT),
> + srom->reg_base + EXYNOS_SROM_BC0 + bank);
> +
> + return 0;
> +}
> +
> static int exynos_srom_probe(struct platform_device *pdev)
> {
> - struct device_node *np;
> + struct device_node *np, *child;
> struct exynos_srom *srom;
> struct device *dev = &pdev->dev;
>
> @@ -100,6 +137,9 @@ static int exynos_srom_probe(struct platform_device *pdev)
> return -ENOMEM;
> }
>
> + for_each_child_of_node(np, child)
> + decode_sromc(srom, child);
You ignore the return value here so bank may be not configured but
device probe will return 0.
Maybe clean up and fail the probe?
Best regards,
Krzysztof
> +
> return 0;
> }
>
>
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