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Date: Wed, 04 Nov 2015 17:20:40 +0900
From: Krzysztof Kozlowski <k.kozlowski@...sung.com>
To: Pavel Fedin <p.fedin@...sung.com>, devicetree@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org,
linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
Mark Rutland <mark.rutland@....com>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
Kumar Gala <galak@...eaurora.org>,
Kukjin Kim <kgene@...nel.org>
Subject: Re: [PATCH v5 3/4] drivers: exynos-srom: Add support for bank
configuration
On 03.11.2015 18:16, Pavel Fedin wrote:
> Implement handling properties in subnodes and adding child devices to the
> system. Child devices will not be added if configuration fails.
>
> Since the driver now does more than suspend-resume support, dependency on
> CONFIG_PM is removed.
>
> Signed-off-by: Pavel Fedin <p.fedin@...sung.com>
> ---
> arch/arm/mach-exynos/Kconfig | 2 +-
> drivers/soc/samsung/Kconfig | 2 +-
> drivers/soc/samsung/exynos-srom.c | 60 +++++++++++++++++++++++++++++++++++++--
> 3 files changed, 60 insertions(+), 4 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..49b5c9e 100644
> --- a/drivers/soc/samsung/exynos-srom.c
> +++ b/drivers/soc/samsung/exynos-srom.c
> @@ -14,6 +14,7 @@
> #include <linux/module.h>
> #include <linux/of.h>
> #include <linux/of_address.h>
> +#include <linux/of_platform.h>
> #include <linux/platform_device.h>
> #include <linux/slab.h>
>
> @@ -67,11 +68,50 @@ 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)
I missed that one previously: add prefix and more descriptive name, like:
exynos_srom_parse_child()
> +{
> + u32 bank, width, pmc;
> + u32 timing[6];
> + u32 cs, bw;
> +
> + if (of_property_read_u32(np, "reg", &bank))
> + return -EINVAL;
> + if (of_property_read_u32(np, "reg-io-width", &width))
> + width = 1;
> + if (of_property_read_u32(np, "samsung,srom-page-mode", &pmc))
> + pmc = 0;
> + if (of_property_read_u32_array(np, "samsung,srom-timing", timing,
> + ARRAY_SIZE(timing)))
> + return -EINVAL;
> +
> + bank *= 4; /* Convert bank into shift/offset */
> +
> + cs = 1 << EXYNOS_SROM_BW__BYTEENABLE__SHIFT;
> + if (width == 2)
> + cs |= 1 << EXYNOS_SROM_BW__DATAWIDTH__SHIFT;
> +
> + bw = __raw_readl(srom->reg_base + EXYNOS_SROM_BW);
> + bw = (bw & ~(EXYNOS_SROM_BW__CS_MASK << bank)) | (cs << bank);
> + __raw_writel(bw, srom->reg_base + EXYNOS_SROM_BW);
> +
> + __raw_writel((pmc << EXYNOS_SROM_BCX__PMC__SHIFT) |
> + (timing[0] << EXYNOS_SROM_BCX__TACP__SHIFT) |
> + (timing[1] << EXYNOS_SROM_BCX__TCAH__SHIFT) |
> + (timing[2] << EXYNOS_SROM_BCX__TCOH__SHIFT) |
> + (timing[3] << EXYNOS_SROM_BCX__TACC__SHIFT) |
> + (timing[4] << EXYNOS_SROM_BCX__TCOS__SHIFT) |
> + (timing[5] << 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;
> + bool error = false;
The 'error' name is misleading - like error for entire probe which is
not true.
Instead split it to separate function like:
+static int exynos_srom_parse_children(....) {
+ int ret = 0;
+
+ for_each_child_of_node(np, child) {
+ ret = exynos_srom_parse_child(srom, child);
+ if (ret) {
+ dev_err(dev,
+ "Could not decode bank configuration for %s: %d\n",
+ child->name, ret);
+ break;
+ }
+ }
+
+ return ret;
+}
Best regards,
Krzysztof
>
> np = dev->of_node;
> if (!np) {
> @@ -100,7 +140,23 @@ static int exynos_srom_probe(struct platform_device *pdev)
> return -ENOMEM;
> }
>
> - return 0;
> + for_each_child_of_node(np, child) {
> + if (decode_sromc(srom, child)) {
> + dev_err(dev,
> + "Could not decode bank configuration for %s\n",
> + child->name);
> + error = true;
> + }
> + }
> +
> + /*
> + * If any bank failed to configure, we still provide suspend/resume,
> + * but do not probe child devices
> + */
> + if (error)
> + return 0;
> +
> + return of_platform_populate(np, NULL, NULL, dev);
> }
>
> static int exynos_srom_remove(struct platform_device *pdev)
>
--
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